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Day 1 > Physical Chemistry > Flashcards

Physical Chemistry Flashcards

1
Q

One kilogram of water (c = 4.2 kJ/kgK) is heated by 300 Btu energy. What is the change in temperature in K?
A. 73.8
B. 17.9
C. 74.4
D.75.4

A

D.75.4

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2
Q

A sample of metal is weighing 400 g is heated to 96.5ºC and then dropped into a calorimeter containing 2000g of water at 20ºC. If the final temperature becomes 21.5ºC, what is the specific heat of the metal in cal/g-ºC?
A. 0.10
B. 0.12
C. 0.14
D. 0.16

A

A. 0.10

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3
Q

In an experiment determine the specific heat of copper, a piece of copper weighing 50 g is first heated to 100 ºC in steam. It is then immersed into water at 27 ºC. The water in calorimeter weighs 100 g and the inner aluminum cap weighs 50 g. If the final temperature is 30ºC, what is the specific heat of copper, specific heat of aluminum is 0.22 cal/g-ºC?
A. 0.88 cal/g-ºC
B. 0.66 cal/g-ºC
C. 0.077 cal/g-ºC
D. 0.095 cal/g-ºC

A

D. 0.095 cal/g-ºC

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4
Q

Ten kilograms of -10 C ice is added to 100 kg of 20 C water. What is the eventual temperature, in C, of the water? Assume an insulated container.
A. 9.2
B. 10.5
C. 11.4
D. 12.6

A

B. 10.5

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5
Q

Two liquids enter a mixing chamber and are discharged at 80ºF at the rate of 50 gal/min. Liquid A enters at 140ºF with specific heat of BTU/gal- ºF. Liquid B enters at 65ºF with specific heat of 8.33 BTU/gal-ºF. What is the volume flow for liquid B?
A. 41.38 gal/min
B. 8.62 gal/min
C. 38.75 gal/min
D. 11.25 gal/min

A

A. 41.38 gal/min

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6
Q

Suppose you are given of the following hypothetical reactions: X → Y ∆H = -80 kJ ; X → Z ∆H = -125 kJ. Use Hess’s law to calculate the enthalpy change for the reaction Y → Z.
A. -45 kJ
B. +45kJ
C. -205 kJ
D. +205 kJ

A

A. -45 kJ

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7
Q

From the following heats reaction:
N2 (g) + 2O2(g) → 2NO2(g) ∆H = 67.6 kJ
2NO(g) + O2(g) → 2NO2(g) ∆H = -113.2 kJ
Calculate the heat of the reaction N2(g) + O2(g) → 2NO2(g).
A. 55.6 kJ
B. -55.6 kJ
C. 180.0 kJ
D. -180.8 kJ

A

C. 180.0 kJ

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8
Q

Aluminum displaces chromium from chromium(III) oxide 2Al + Cr2O3 —- Al2O3 + 2Cr ∆H = -536 kJ. How much heat will be released in the reaction of 10 g of aluminum with 25 g of Cr2O3? Al = 26.98u, Cr= 52u, O=16u
A. -100.6kJ
B. 89.5kJ
C. 58.7kJ
D. -87.9kJ

A

D. -87.9kJ

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9
Q

The fuel used in spacecraft must contain as much enery per gram of materials as possible. Based on this consideration only, which of the following fuels is best suited to be a spacecraft fuel?
(I) Dimethylhydrazine, (CH3)2NNH2; ∆H of combustion = - 1694 kJ/mol
(II) Methanol, CH3OH; ∆H of combustion = -726 kJ/mol
(III) Ethanol, C2H5OH; ∆H of combustion = -1371 kJ/mol
(IV) Octane, C8H18; ∆H of combustion = -5500 kJ/mol

A. Dimethylhydrazine
B. methanol
C. ethanol
D. octane

A

D. octane

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10
Q

Consider the following reaction; 2Na(s) + Cl2(g) → 2NaCl (s) ∆H = -821.8 kJ. What is the amount of heat transferred when 5.6 g Na(s) reacts at constant pressure?
A. 821.8 kJ
B. 4600 kJ
C. 2.0 E 2 kJ
D. 1.0 E 2 kJ

A

D. 1.0 E 2 kJ

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11
Q

C2H6(g) + 3.5 O2 (g) → 2CO2(g) + 3H2O (g) ∆H = -1430 kJ. What is the enthalpy change for the reverse reaction if whole-number coefficients are used?
A. +1430 kJ
B. -1430 kJ
C. -2860 kJ
D. +2860 kJ

A

D. +2860 kJ

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12
Q

The heat of combustion of a n-heptane at constant volume and 20ºC is 1148.93 kcal/mole. What is the value of the of reaction at constant pressure?
A. -115.13 cal/mole
B. -1151.3 kcal/mole
C. -1151.3 cal/mole
D. 1151.3 kcal/mole

A
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13
Q

How much oil at 200ºC must be added to 50 grams of the same oil at 20ºC to heat it 70ºC?
A. 12.39 grams
B. 29.12 grams
C. 19.23 grams
D. 23.91 grams

A
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14
Q

Thirty pounds of ice at 32ºF is placed in 100 lb of water at 100ºF. (The latent heat of ice may be taken as 144 BTU/lb). If no heat lost or added to the mixture, the temperature when equilibrium is reached is
A. 48ºF
B. 49ºF
C. 50ºF
D. 51ºF

A

D. 51ºF

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15
Q

From the following heats of reaction
2C (graphite) + H2(g) → C2H2(g) ∆H = 227 kJ/mol
6C (graphite) + 3H2 (g) → C6H6 (l) ∆H = 49 kJ/mol
Calculate the heat for the reaction 3C2H2 (g) → C6H6(l)
A. 26.7 kJ/mol
B. -26.7 kJ/mol
C. -178 kJ/mol
D. -632 kJ/mol

A

D. -632 kJ/mol

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16
Q

From the following heats of reaction;
N2(g) + 2O2(g) → 2NO2(g) ∆H = 67.6 kJ
2NO(g) + O2(g) → 2NO2(g) ∆H = -113.2 kJ
Calculate the heat of the reaction N2(g) + O2(g) → 2NO(g).
A. 55.6 kJ
B. -55.6 kJ
C. 180.0 kJ
D. -180.8 kJ

A

C. 180.0 kJ

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17
Q

Calculate the standard heat of reaction per mole of C6H6 for the following reaction. C6H6(g) → 3C2H2(g)
A. -650.2 kJ/mol
B. 597.4 kJ/mol
C. 650.2 kJ/mol
D. 750.1 kJ/mol

A

B. 597.4 kJ/mol

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18
Q

A 220-g sample of quinine, C6H4O2, is burned in a bomb calorimeter whose total heat capacity is 7.854 kJ/ºC. The temperature of calorimeter increases from 23.44ºC to 30.57ºC. What is the heat of combustion per gram of quinine? (molecular weight of quinine is 108.1)
A. -123 kJ/g, -13300 kJ/mol
B. -25.5kJ/g, -2750 kJ/mol
C. -25.5 kJ/kg, -235 kJ/mol
D. -3.57 kJ/g, -385 kJ/mol

A

B. -25.5kJ/g, -2750 kJ/mol

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19
Q

Calculate the heat of reaction for the following at 25ºC and 1 atm; CaC2 (s) + 2H2O(I) → Ca(OH)2(s) + C2H2(g).
A. -20715 cal
B. -24800 cal
C. -29972 cal
D. -35420

A

C. -29972 cal

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20
Q

Calculate the equilibrium constant (Kp) for the following reaction at 25ºC: C(graphite) + 2H2(g) → CH4(g).
A. 8.1 E8
B. 1.2 E5
C. 2.8 E6
D. 3.1 E3

A

A. 8.1 E8

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21
Q

Calculate the change in internal energy for the combustion of 1.00 mol of propene given that change in enthalpy is -2058 kJ.
A. -2052 kJ
B. 2052 kJ
C. 2459 kJ
D. -2450 kJ

A

A. -2052 kJ

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22
Q

A calorimeter of mass 125 g contains 130 g of water at 20ºC. A 6.1-gram mass of steam at 100 ºC is introduced to calorimeter and condensed in water. What is the final temperature of the water? Assume that no heat is lost to the surroundings and that the value of c for the calorimeter is 0.10 kcal/kg-ºC. Heat of vaporization of water is 540 kcal/kg.
A. 38.5 ºC
B. 42.5 ºC
C. 43.7 ºC
D. 45.5 ºC

A

D. 45.5 ºC

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23
Q

How many kilograms of ice at 0ºC must be added to 0.6 kg of water at 100 ºC in an insulated 0.1-kg copper container in order to cool the container and its contents to 30ºC? The specific heats of water and copper are 4.2 and 0.39 kJ/kg.K, respectively; the heat of fusion of ice is 335 kJ/kg.
A. 0.39 kg
B. 0.43 kg
C. 0.58 kg
D. 0.61 kg

A

A. 0.39 kg

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24
Q

The temperatures of three different liquids are maintained at 15ºC, 20ºC, and 25ºC respectively. When equal masses of the first two liquids are mixed, the final temperature is 18ºC, and when equal masses of the last two liquids are mixed, the final temperature is 24ºC. What temperature will be achieved by mixing equal masses of the first and the last liquid?
A. 8.65 ºC
B. 10.30 ºC
C. 15.83 ºC
D. 23.57 ºC

A

D. 23.57 ºC

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25
Q

A partly filled barrel contains 300 lb of water and 100 lb of ice at 32ºF. How many pounds of steam at 212ºF must be run into the barrel to bring its contents up to 80ºF?
A. 30.5 lb
B. 36.1 lb
C. 38.9 lb
D. 39.7 lb

A

A. 30.5 lb

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26
Q

When 20 kJ of heat is removed from 1.2 kg of ice originally at -15ºC, its new temperature is
A. -18 ºC
B. -23 ºC
C. -26 ºC
D. -35 ºC

A

B. -23 ºC

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27
Q

When 10 lb of water at 50ºF is poured over 1 lb of ice at 0ºF, the resulting mixture is at
A. 19 ºF
B. 31 ºF
C. 32 ºF
D. 34 ºF

A

D. 34 ºF

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28
Q

Seven pounds of steam at atmospheric pressure, superheated to 242ºF, is introduced simultaneously with 8 lb of ice at 25ºF into a copper calorimeter which weighs 5 lb and which contains 50 lb of water at 60ºF. The heats of fusion and of vaporization for water are 144 and 970 BTU per lb, respectively. The thermal capacities in BTU per pound per ºF may be taken as follows; steam 0.48; ice 0.50; and copper 0.093 cal/g-ºC. Neglecting heat losses to all bodies other than the calorimeter itself, the resulting temperature of the mixture is
A. 135 ºF
B. 148 ºF
C. 157 ºF
D. 160 ºF

A

D. 160 ºF

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29
Q

Find the amount of steam at 212ºC which must be blown into 400 lb water originally at 70ºF in order to make the final temperature 212ºF. Heat losses amount to 2000 Btu. The latent heat at 212ºF is 970.3 Btu/lb.
A. 42.1 lbs
B. 48.0 lbs
C. 50.9 lbs
D. 60.6 lbs

A

D. 60.6 lbs

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30
Q

Determine the final temperature when 10g of copper and 20 g of lead at -100ºC are added to 50 g of water at 50ºC. Disregard spurious heat losses. The atomic weight of copper is 63.55 g/mol, and the specific heat of lead = 0.032 cal/g-ºC = 0.134J/g ºC.
A. 33.21 ºC
B. 38.21 ºC
C. 39.1 ºC
D. 45.21 ºC

A

D. 45.21 ºC

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31
Q

A steam condenser receives 10 kg per second of steam with an enthalpy of 2,570 k/kg. Steam condenses into liquid and leaves w ith an enthalpy of 160 kJ/kg. Cooling water passes through the condenser with temperature increases from 13ºC to 24ºC. Calculate the cooling water flow rate in kg/s.
A. 533
B. 523
C. 518
D. 528

A
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32
Q

Calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic for a chemical reaction in which 10.0 kJ of heat is absorbed while the system does no work on the surroundings.
A. 10 kJ, exothermic
B. 10 kJ, exothermic
C. 10 kJ, endothermic
D. -10 kJ, endothermic

A

C. 10 kJ, endothermic

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33
Q

Consider the followimg reaction : 2C2H2 (s) + 5O2(g → 4CO2(g) + 2H2O(g) ∆H = -2511 kJ/mol. Calculate the amount of heat transferred when 2.60 g of C2H2(g) is consumed in this reaction at constant pressure.
A. 126 kJ
B. 251 kJ
C. 502 kJ
D. 3.26 E 3 kJ

A

A. 126 kJ

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34
Q

A student observed that a small amount of acetone sprayed on the back of the hand felt very cool compared to a similar amount of water. Your if this phenomenon be that
A. All organic compound do this
B. Acetone has a lower viscosity and transfer heat quanta better
C. Water has a higher heat capacity than acetone, therefore retaining more heat
D. The higher vapor pressure of acetone results in more rapid evaporation and heat loss
E. The observed effect is not real and is only imagined

A
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35
Q

The terms “sweet” and “sour” in natural gas terminology are used to denote the absence or presence of _______________.
A. CO
B. methane
C. H2S
D. glucose

A

C. H2S

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36
Q

It is the solid, cellular, infusible material remaining after the carbonization of coal, pitch, petroleum residue and certain other carbonaceous materials.
A. Coke
B. char
C. wood
D. peat

A

A. Coke

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37
Q

It is a nonporous rock containing organic kerogen.
A. Tar sands
B. Natural gas
C. oil shale
D. coal-oil mixtures (COM)

A

C. oil shale

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38
Q

It is the nonagglomerated, nonfusible residue from the thermal treatment of solid carbonaceous material.
A. Charcoal
B. tanbark
C. bagasse
D. char

A

D. char

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39
Q

Higher heating value of the combustion of ethane in calorie per gram is
A. 12399.2
B. 13265.1
C. 22304
D. 272.820

A

A. 12399.2

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40
Q

These are materials remaining from the burning wood, coal, coke and other combustible wastes.
A. Food waste
B. rubbish
C. ashes and residues
D. special waste

A

C. ashes and residues

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41
Q

Energy crossing the system boundary under the influence of a temperature difference or gradient.
A. Work
B. heat
C. internal energy
D. enthalpy

A

B. heat

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42
Q

The specific gravity of the substance is the ratio of the density of the substance to the density of water. Another term for specific gravity:
A. Specific heat
B. unit weight
C. relative density
D. density

A

C. relative density

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43
Q

What is produce when calcium carbide is mixed with water?
A. acetylene
B. ethylene
C. propylene
D. methane

A

A. acetylene

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44
Q

A device substantially without moving parts, in which a fuel, such as hydrogen, natural gas, methanol, or propane, can be converted directly into twice the quantity of electrical energy that would result from the usual boiler-turbine-generator combination.
A. fuel cell
B. steam power plant
C. geothermal plant
D. heat engine

A

A. fuel cell

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45
Q

It is produced by the decay of the vegetable matter, was early identified as combustible “swamp gas”.
A. producer gas
B. furnace gas
C. hydrogen
D. methane

A

D. methane

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46
Q

Calcium carbonate is also known as
A. chalk
B. charcoal
C. feldspar
D. silica

A

A. chalk

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47
Q

It is non-Newtonian fluid which shows an apparent viscosity that decreases with increasing velocity gradients
A. pseudoplastic fluids
B. Bingham fluids
C. Bingham plastics
D. dilatant fluids

A

A. pseudoplastic fluids

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48
Q

Which of the following will have largest size?
A. Br
B. I-
C. I
D. F

A

B. I-

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49
Q

Which element has the greatest tendency to lose electrons?
A. F
B. S
C. Fr
D. Be

A

C. Fr

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50
Q

An electron emitted from the nucleus of a radioactive element is called
A. positron
B. antiproton
C. Beta-particle
D. alpha particle

A
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51
Q

H2 is passed through oils in order to
A. Convert liquid oil into solidified oil
B. Convert unsaturated hydrocarbon to saturated hydrocarbon
C. Convert lower oil into higher oil
D. All of the above statements are correct

A

B. Convert unsaturated hydrocarbon to saturated hydrocarbon

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52
Q

Solution of sodium metal in liquid ammonia is strongly reducing due to the presence in the solution of the following.
A. Sodium atoms
B. Solvated electrons
C. Solvated hydride
D. Sodium amide

A

B. Solvated electrons

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53
Q

What is the effect of shaking dil. H2SO4 with a small quantity of anhydrous CuSO4?
A. The white solid dissolves to form a colourless solution
B. The white solid dissolves to form a green solution
C. The white solid turns blue but does not dissolve
D. The white solid dissolves to form a blue solution

A

D. The white solid dissolves to form a blue solution

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54
Q

Galvanization is the
A. Deposition of zinc on iron
B. Deposition of Al on Fe
C. Deposition of tin on Fe
D. Deposition of Cu on Fe

A

B. Deposition of Al on Fe

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55
Q

Cinnabar is ore of
A. Hg
B. Cu
C. Pb
D. Zn

A

A. Hg

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56
Q

Bleaching powder is obtained by the interaction of chlorine and
A. Dilute solution of Ca(OH)2
B. Concentration solution of Ca(OH)2
C. Dry calcium oxide
D. Dry slaked lime

A

D. Dry slaked lime

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57
Q

Mercury is transported in metal containers made of
A. silver
B. Lead
C. Iron
D. Aluminum

A

C. Iron

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58
Q

In tubes having very small diameters, liquids are observed to rise or fall relative to the level of the surrounding liquid. What do you call this phenomenon?
A. fluidity
B. capillarity
C. surface tension
D. viscosity

A

B. capillarity

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59
Q

Viscosities can change with time assuming all other conditions to be constant. If viscosities increase with time up to a finite value, how do you call the fluid?
A. pseudoplastic fluid
B. colloidal fluid
C. rheopectic fluid
D. thixotropic fluid

A

C. rheopectic fluid

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60
Q

Which of the following fluids exhibit viscosities that increase with increasing agitation but they return rapidly to their normal viscosity after the agitation ceases?
A. Bingham fluids
B. dilatant fluids
C. Newtonian fluids
D. pseudoplastic fluids

A

B. dilatant fluids

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61
Q

What do you call the volume occupied by a unit mass of fluid?
A. specific volume
B. density
C. specific gravity
D. specific weight

A

A. specific volume

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62
Q

What device is used to protect the pipeline from bursting due to pressure rise when the water in the pipeline is brought to rest?
A. surge tank
B. check valve
C. sluice gate
D. float

A

A. surge tank

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63
Q

Austenite form of iron has FCC crystal lattice structure, whereas its alpha form has BCC crystal lattice structure. Assuming closest packed arrangement of iron atoms, what will be the ratio of density of Austenite to that alpha iron?
A. 1:1.088
B. 1:1.837
C. 1:1
D. 1.088:1

A

D. 1.088:1

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64
Q

The frequency of an x-ray is 6.21 E18 Hz. What is its wavelength?
A. 1.86E-27 m
B. 4.83E-11 m
C. 1.11E-17 m
D. 5.37E-28 m

A

B. 4.83E-11 m

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65
Q

f the infrared radiation has a wavelength of 3.5 microns, what will be the wave no. is cm-1?
A. 3000
B. 2500
C. 2900
D. 2700

A

C. 2900

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66
Q

Determine the frequency of light having a wavelength of 1 angstrong.
A. 3.0E 18 Hz
B. 3.0E 17 Hz
C. 3.0E 16 Hz
D. 3.0E 15 Hz

A

A. 3.0E 18 Hz

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67
Q

The siren of a fire engine has a frequency of 500 Hz. If the fire engine approaches a stationary car at 20 m/s, what frequency does the person in a car hear?
A. 471 Hz
B. 500 Hz
C. 531 Hz
D. 565 Hz

A

C. 531 Hz

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68
Q

What is the energy equivalent of a mass of 1 kg?
A. 9 E16 J
B. 9 E13 J
C. 9 E10 J
D. 9 E7 J

A

A. 9 E16 J

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69
Q

What is the binding energy per nucleon in a deuteron (deuterium nucleus) in electron volts?
Deuteron = 2.01355u, proton = 1.00727663u, neutron = 1.0086654u
A. 1.48 E5 eV
B. 1.46 E6 eV
C. 1.46 E7 eV
D. 1.46 E8 eV

A

B. 1.46 E6 eV

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70
Q

The radiant energy of the sun is due to
A. Combustion
B. nuclear fusion
C. disintegration
D. nuclear fission

A

B. nuclear fusion

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71
Q

An electron emitted from the nucleus of a radioactive element is called
A. Positron
B. antiproton
C. Beta-particle
D. none of these

A

C. Beta-particle

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72
Q

Cathode rays are
A. Alpha particles
B. electrons
C. gamma rays
D. protons

A

B. electrons

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73
Q

A nucleus has a mass no. of 155. What is its mass no after alpha emission?
A. 153
B. 150
C. 151
D. 159

A

C. 151

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74
Q

When U-235 nucleus is struck by a thermal neutron, fission occurs with the release of neutrons. If the fission fragments are Sr-90 and Xe-144, how many neutrons are released?
A. 0
B. 4
C. 2
D. 3

A

C. 2

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75
Q

Given the equation 94Pu239 + 0n
1 → 58Ce144 + 20n1. The missing component of the equation is
A. 36Kr94 at the reactant side
B. The equation is already complete
C. 36Kr94 at the product side
D. 36Kr94 should be added on both sides

A

C. 36Kr94 at the product side

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76
Q

The half-life of Bi-210 is five days. In what period of time would the activity of a given sample of isotope be reduced by 20% ?
A. 1.61 days
B. 3.68 days
C. 6.61 days
D. 11.61 days

A

A. 1.61 days

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77
Q

A certain radioactive material is known to decay at a rate proportional to the amount present. If initially 500 mg of the material is present and after 3 years 20% of the original mass has decayed, find the amount remaining after 200 weeks.
A. 355.5 mg
B. 375.6 mg
C. 372.4 mg
D. 317.8 mg

A

B. 375.6 mg

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78
Q

In a chemical transformation, substance A changes into another substance at the rate proportional to the amount of A unchanged. If initially there was 40 g of A and 1 hr later 18 g, when will 90% of A be transformed?
A. 2.88 hr
B. 2.15 hr
C. 1.92 hr
D. 1.50 hr

A

A. 2.88 hr

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79
Q

The number of undecayed nuclei in a sample of bromine-87 decreased by a factor of 4 over a period of time 112 seconds. What is the rate constant for the decay of bromine-87?
A. 56 sec
B. 0.693 sec
C. 0.0124 sec
D. 0.00619 sec

A

C. 0.0124 sec

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80
Q

A sample of wheat recovered from a cave was analyzed and gave 12.8 disintegrations of carbon-14 per minute per gram of carbon. What is the age of the grain? Carbon from living materials decays at rate of 15.3 disintegrations per minute per gram of carbon? The half-life of carbon-14 is 5730 years.
A. 1500 yrs
B. 2000 yrs
C. 2500 yrs
D. 3000 yrs

A
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81
Q

Polonium crystalize in a simple cubic pattern with a unit cell length of a 3.36 Angstrong. Estimate the density of Po in g/cm3.
A. 5.44
B. 6.12
C. 7.84
D. 9.20

A

D. 9.20

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82
Q

What is the binding energy per nucleon in a deuteron (deuterium nucleus) in joules?
Deuteron = 2.01355u, proton = 1.00727663u, neutron = 1.0086654u
A. 2.34 E-25
B. 2.34 E-26
C. 2.34 E-12
D. 2.34 E-13

A

D. 2.34 E-13

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83
Q

The wavelength of a beam is 24 micrometer. What is its wave no.?
A. 380/cm
B. 417/cm
C. 440/cm
D. 490/cm

A

B. 417/cm

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84
Q

The wavelength of a beam is 24 micrometer. What is its wave number?
A. 8.29 E-21 J
B. 2.78 E-20 J
C. 3.21 E-19 J
D. 3.08 E-17J

A

A. 8.29 E-21 J

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85
Q

What is the symbol for the nucleus remaining after 35Cl17 undergoes beta emission?
A. 35Krl18
B. 35Cl18
C. 35Arl17
D. 35Ar18

A

D. 35Ar18

86
Q

A nucleus has an atomic number of 40. What is its atomic number after beta emission?
A .42
B. 44
C. 36
D. 41

A

D. 41

87
Q

The half-life of tritium is 12.5 years. How much will remain after 100 years if you started out with 256 grams?
A. 2.56 g
B. 1 g
C. 16 g
D. 82 g

A

B. 1 g

88
Q

The half-life of phosphorus-33 is 25 days. How much of a 128-g sample will remain after 150 days?
A. 16 g
B. 8 g
C. 4 g
D. 2 g

A

D. 2 g

89
Q

A 6.30-mg sample of a newly discovered isotope was analyzed and found to contain only 4.75 mg after a period of 27.2 hours. What is the half-life (in hours) of the isotope?
A .27.2
B. 8.13
C. 92.3
D. 66.7

A

D. 66.7

90
Q

A fossil fern containing 0.110 lbm of carbon is carbon dated to determine its age. The decay rate of C-14 in the fossil is 191 decays/min. How old is the fern? (The half-life of C-14 is 5730 years, and the rate of decay of C-14 in a living organism is 6800 decays/min-lbm C)
A. 7290 yrs
B. 11300 yrs
C. 14100 yrs
D. 23800 yrs

A

B. 11300 yrs

91
Q

Aluminum has a face-centered cubic unit cell, that is, an atom at each corner unit cell and an atom at the center of each face. The Al-Al distance (2r) is 0.2863 nm. Calculate the density of aluminum. The mass of aluminum atom is 26.98 amu.
A. 1.3 g/ml
B. 2.1 g/ml
C. 2.7 g/ml
D. 3.5 g/m

A

C. 2.7 g/ml

92
Q

What is the energy of a photon (in J) of red light with a frequency of 4.6 E14 Hz?
A. 3.05 E-19
B. 3.05 E-17
C. 7.24 E-16
D. 7.24 E-14

A

A. 3.05 E-19

93
Q

What is the de Broglie wavelength associated with an electron with a velocity of 6 E6 m/s?
A. 4.12 E-9 m
B. 1.21 E-10 m
C. 9.54 E-11 m
D. 2.14 E-12 m

A

B. 1.21 E-10 m

94
Q

What is the wavelength of blue light, which has a frequency of 6.4 E14/s?
A. 240 nm
B. 470 nm
C. 520 nm
D. 655 nm

A

B. 470 nm

95
Q

What is the frequency of radiation that has a wavelength of 0.589 pm?
A. 1.96 E-21 Hz
B. 5.09 Hz
C. 5.09 E20 Hz
D. 5.09 E22 Hz

A

C. 5.09 E20 Hz

96
Q

What is the wavelength of radiation that has a frequency of 5.11 E11 Hz?
A. 5.87 E-12 m
B. 5.87 E-4 cm
C. 5.87 E-4 m
D. 5.87 E-2 m

A

C. 5.87 E-4 m

97
Q

What is the product formed from Po-207 by positron emission?
A. At-207
B. Bi-206
C. At-208
D. Bi-207

A

D. Bi-207

98
Q

What is the product formed from Th-232 by alpha particle emission?
A. Ra-232
B. Ac-232
C. Th-228
D. Ra-228

A

D. Ra-228

99
Q

Given the nuclear reaction 92U236 + 0n1 → 62Sm160 + 30Zn72. To complete the equation, which of the following should be done?
A. Add 40n1 at the reactant side
B. Add 2He4 at the product side
C. add 40n1 to the product side
D. add 2He4 at the reactant side

A

C. add 40n1 to the product side

100
Q

How many protons, neutrons, and electrons are in the carbon isotope C-14?
A. 6 protons, 6 electrons and 8 neutrons
B. 6 protons, 8 electrons and 14 neutrons
C. 6 protons, 6 electrons and 14 neutrons
D. 14 protons, 6 electrons and 8 neutrons

A

A. 6 protons, 6 electrons and 8 neutrons

101
Q

What is emitted in the following nuclear reaction? N-14 → C-13 + ?
A. Electron
B. neutron
C. beta particle
D. proton

A

D. proton

102
Q

What does X represent in the following nuclear reaction?
1327Al + 24He → 1530P + X
A. Beta particle
B. positron
C. alpha particle
D. neutron

A

D. neutron

103
Q

The most penetrating of the following radiation is
A. An alpha particle
B. an electron
C. a positron
D. a gamma ray

A

D. a gamma ray

104
Q

Au-198 has a half-life of 2.70 days. Assuming you start with a 10 mg sample of Au-198, how much will remain after 10 days?
A. 0.768 mg
B. 0.0271 mg
C. 1.27 mg
D. 0.631 mg

A

A. 0.768 mg

105
Q

The half-life for the beta decay of Pa-233 is 27.4 days. How many days must pass to reduce a 5-g sample of Pa-233 to 0.625 g?
A. 27.4 days
B. 137 days
C. 109.6 days
D. 82.2 days

A

D. 82.2 days

106
Q

I-131 has a half-life of 8.04 days. Assuming you start with a 1.35 mg sample of I-131, how much will remain after 13 days?
A. 0.268 mg
B. 0.422 mg
C. 0.440 mg
D. 0.835 mg

A

C. 0.440 mg

107
Q

The half-life of the beta decay of cesium-137 is 30 yrs. How many years must pass to reduce a 25-mg sample of cesium-137 to 0.78 mg?
A. 750 yrs
B. 60 yrs
C. 180 yrs
D. 150 yrs

A

D. 150 yrs

108
Q

Cobalt-60, which emits gamma rays and beta particles, is widely used in medicine to kill cancer cells. If a patient is given 6.80 micrograms of cobalt-60, how much will remain after 20 years if its half-life is 5.27 years?
A. 0.425 micrograms
B. 0.490 micrograms
C. 94.3 micrograms
D. 0.0159 micrograms

A

B. 0.490 micrograms

109
Q

The half-life of sulfur-35 is 88 days. If 8 g of sulfur-35 exists on day one, what fraction will remain after 264 days?
A. 1 g
B. 0.5 g
C. 2 g
D. 4 g

A

A. 1 g

110
Q

The half-life of tritium (hydrogen-3) is 12.3 yrs. If 48 mg of tritium is released from a nuclear power plant during the course of an accident, what mass of these nuclei will remain after 49.2 yrs?
A. 3 mg
B. 0 mg
C. 6 mg
D. 12 mg

A

A. 3 mg

111
Q

In the troposphere, ozone is produced during the daylight and consumed during the darkness. Determine the half-life of ozone if it is depleted to 10% of its initial value after 10 hrs of darkness.
A. 3 hrs
B. 3.5 hrs
C. 4 hrs
D. 4.5 hrs

A

A. 3 hrs

112
Q

The half-life of a certain first order reaction is 60 minutes. How long will it take for 90% of the reaction to occur?
A. 1.99 min
B. 19.9 min
C. 199 min
D. 0.199 min

A

C. 199 min

113
Q

A radioactive material has a half-life of 68.3 minute. What percentage of the original sample will remain at the end of 3 hrs?
A. 16.2%
B. 12.7%
C. 21.4%
D. 83.7%

A

A. 16.2%

114
Q

A certain reaction is first order in A. the specific rate constant is 3 E-3/s. The half-life is
A. 2.1 E-3 s
B. 100 s
C. 231 s
D. 768 s

A

C. 231 s

115
Q

If 12.5 micrograms of a radioactive isotope remain out of 50 micrograms after 12 hrs. have passed, the half-life of the radioisotope is
A. 24 hrs
B. 12 hrs
C. 6 hrs
D. 3 hrs

A

C. 6 hrs

116
Q

If 1 g of an isotope has a half-life of 15 hrs, the half-life of the 0.50 g sample is
A. 15 hrs
B. 30 hrs
C. 7.5 hrs
D. 60 hrs

A

A. 15 hrs

117
Q

A certain radioactive substance has a half-life of 38 hrs. Find how long it takes for 90% of the radioactivity to be dissipated?
A. 12.6 hrs
B. 1.26 hrs
C. 126 hrs
D. 1260 hrs

A

C. 126 hrs

118
Q

A physicist starts out with 320 g of a radioactive element Z and after 20 mins he has only 20 g left. What is the half-life of the element Z?
A. 2 min
B. 3 min
C. 4 min
D. 5 min

A

D. 5 min

119
Q

A 0.470-kg sample of charcoal recovered from the excavation of an ancient campfire has an activity of 0.5 E-3 μCi. What is its approximate age?
Half-life of C-14 = 5730 yrs
A. 18000 yrs
B. 15500 yrs
C. 10000 yrs
D. 8000 yrs

A

B. 15500 yrs

120
Q

A sample of wood from an Egyptian thumb gave a C-14 activity per mass of 7.3 per minute per gram. What is the age of the wood?
Half-life of C-14 = 5730 yrs and initial activity of C-14 is 12.6 min per gram.
A. 3000 yrs
B. 3580 yrs
C. 4100 yrs
D. 4510 yrs

A

D. 4510 yrs

121
Q

The second is the duration of radiation of what radioactive element?
A. Magnesium
B. Krypton
C. Cesium
D. Platinum

A

C. Cesium

122
Q

For first order reactions the rate constant, k, has the units
A. Mol/L-time
B. L/mol
C. time
D. 1/time

A

D. 1/time

123
Q

It is the time required for the concentration of a reactant to drop to one-half of its initial value.
A. Decay life
B. doubling time
C. half-life
D. normal lapse rate

A

C. half-life

124
Q

It is a particle that has the same mass as an electron but opposite charge.
A. Beta particle
B. neutrino
C. positron
D. nucleon

A

C. positron

125
Q

Which of the following types of radiation will be a stopped by a piece of paper?
A. Alpha
B. neutron
C. gamma ray
D. x-ray

A

A. Alpha

126
Q

The mass of a nucleus is less than the total mass of its nucleons. This fact indicates that some of the mass has been converted to
A. Radioactivity
B. photoelectric effect
C. binding energy
D. thermal energy

A

C. binding energy

127
Q

Which of kind of nuclear radiation has high energy and no mass?
A. Alpha
B. gamma
C. beta
D. neutron

A

B. gamma

128
Q

Which substance is used as a coolant in a nuclear reactor?
A. Neutrons
B. hydrogen
C. plutonium
D. heavy water

A

D. heavy water

129
Q

The amount of fissionable materials large enough to maintain the chain in nuclear fission is called the
A. Nuclear binding energy
B. supercritical mass
C. critical mass
D. mass defect

A

C. critical mass

130
Q

The mass defect in a particular nucleus is
A. The difference between the mass of the protons and the mass of the neutrons
B. The mass that has been converted into nuclear binding energy
C. The difference between the calculated and the experimental nuclei mass which is the mass that has been converted into nuclei binding energy
D. The experimental error in determining the nuclei mass

A

C. The difference between the calculated and the experimental nuclei mass which is the mass that has been converted into nuclei binding energy

131
Q

The curie is the measure of the
A. No. of disintegrations per sec of a radioactive substance
B. No. of alpha particles emitted by exactly 1 gram of a radioactive substance
C. Total energy absorbed by an object exposed to a radioactive source
D. Lethal threshold for radiation exposure

A

A. No. of disintegrations per sec of a radioactive substance

132
Q

Which one of the following devices converts radioactive emission to light for detection?
A. Geiger counter
B. photographic film
C. scintillation counter
D. none of these

A

C. scintillation counter

133
Q

Of the following processes, which one will change the atomic no. by +1?
A. Gamma emission
B. electron capture
C. alpha emission
D. beta emission

A

D. beta emission

134
Q

Of the following processes, which one does not change the atomic no.?
A. Positron
B. Beta emission
C. alpha emission
D. gamma emission

A

D. gamma emission

135
Q

The transmission of heat from a hot to a cold body by electromagnetic wave is called:
A. Conduction
B. convection
C. radiation
D. absorption

A

C. radiation

136
Q

What do you call the changing of an atom of an element to an atom of a different atomic mass?
A. Atomic pile
B. atomic energy
C. atomization
D. atom transmutation

A

D. atom transmutation

137
Q

Which type of radiation is not a stream of charged particles?
A. Alpha rays
B. beta rays
C. gamma rays
D. cosmic rays

A

C. gamma rays

138
Q

Which isotope is particularly useful or both diagnostic and therapeutic work with the thyroid gland?
A. Cobalt-60
B. iodine-131
C. technetium-99m
D. tritium

A

B. iodine-131

139
Q

__________ rays are fast moving electrons.
A. Gamma
B. beta
C. alpha
D. kappa

A

B. beta

140
Q

The form of energy in sunlight is
A. Chemical
B. mechanical
C. nuclear
D. radiant

A

D. radiant

141
Q

A piece of wood, reportedly from King Tut’s tomb, was burned, and 7.32 g CO2 was collected. The total radioactivity in the CO2 was 10.8 dis/min. How old was the wood sample? Carbon from living materials decays at a rate of 15.3 disintegrations per min per g of carbon? The half-life of C-14 is 5730 yrs.
A. 8610 yrs
B. 7440 yrs
C. 6280 yrs
D. 5544 yrs

A

A. 8610 yrs

142
Q

A special-purpose piece of laboratory glassware, called a pycnometer, is used to measure liquid densities. It has a volume of 25 cc, and a mass of 17.24 g when it is full of air. When filled with a liquid of unknown density, its mass = 45.0 g. What is the density of this liquid?
A. 1.11 g/mL
B. 1.25 g/mL
C. 1.42 g/mL
D. 1.55 g/mL

A

A. 1.11 g/mL

143
Q

The vapor pressure of an organic liquid is given by the Antoine equation ln P = 14.5463 –2940.46/(T-49.19) where P is in kPa and T is in K. What is the normal boiling point of the substance?
A. 373.2 K
B. 1022.8 K
C. 345.4 K
D. 283.7 K

A

C. 345.4 K

144
Q

The viscosity coefficient of gaseous chlorine at 1 atm pressure and 20ºC is 147.0 micropoise. Find the molecular diameter of the chlorine molecule.
A. 1.3 E-7 cm
B. 1.3 E-8 cm
C. 4.3 E-8 cm
D. 4.3 E-7 cm

A

C. 4.3 E-8 cm

145
Q

The pressure head under which a fluid is moving through a 3 mm tube, which is 78.74 inches long, is 6.5 N/cm2. If 0.04 m3 of this fluid passes through the tube every 1 minute, what is the viscosity of this fluid?
A. 9.7 E5 Pa-s
B. 9.7 E-5 Pa-s
C. 9.07 E5 Pa-s
D. 9.07 E-5 Pa-s

A

B. 9.7 E-5 Pa-s

146
Q

To what height will 68ºF ethyl alcohol rise in a 0.005 in internal diameter glass capillary tube? The density of the alcohol is 49 lb/ft3 and surface tension is 0.0227 N/m.
A. 0.0751 m
B. 0.0923 m
C. 0.1521 m
D. 0.201 m

A

B. 0.0923 m

147
Q

Calculate the reduced pressure of nitrogen at 100 atm.
A. 1.50
B. 2.08
C. 2.75
D. 2.99

A

D. 2.99

148
Q

Estimate the molar volume of CO2 at 500 K and 100 atm by treating it as Van Der Waals gas.
A. 0.152 L/mol
B. 0.254 L/mol
C. 0.305 L/mol
D. 0.366 L/mol

A

D. 0.366 L/mol

149
Q

A mass of 500 g of gaseous ammonia contained in a 30,000 cm3 steel bomb immersed in a constant-temperature bath at 65ºC. Calculate the pressure of the gas using the Redlich-Kwong equation. Tc = 405.6K; Pc = 111.3 atm
A. 27.5 bars
B. 23.86 bars
C. 25.4 bars
D. 30.7 bars

A

B. 23.86 bars

150
Q

Which of these 0.1 M solution will give the highest boiling at 1 atm
A. Table salt solution
B. Barium chloride
C. sugar solution
D. potassium chloride

A
151
Q

LaCl3 is a salt, and like virtually all salts it is completely dissociated into ions in aqueous solution. Suppose we dissolve 0.2453 g LaCl3 in 10 g of H2O. What will be the boiling point of the solution at atmospheric pressure, assuming ideal solution behavior?
A. 100.205ºC
B. 100.051ºC
C. 100.410ºC
D. 100.103ºC

A
152
Q

The osmotic pressure at STP of a solution made from 1 L of NaCl (aq) containing 117 g of NaCl is? Note: NaCl forms a strong electrolytes
A. 44.77 atm
B. 48.87 atm
C. 89.54 atm
D. 117 atm

A

C. 89.54 atm

153
Q

A 0.20 mole aqueous solution freezes at -0.680ºC. The osmotic pressure at 0ºC is
A. 9.8 atm
B. 16.3 atm
C. 6.2 atm
D. 10.6 atm

A

C. 6.2 atm

154
Q

ven-standard electrode potentials
Eº
Fe++ + 2e → Fe -0.440V
Fe+++ + 3e → Fe -0.036V
The standard electrode potential (Eº) for Fe+++ + e → Fe++ is
A. -0.476V
B. -0.404V
C. +0.404V
D. +0.771V

A

C. +0.404V

155
Q

What is the standard cell potential for the cell Zn; Zn+2 (IM) ║Cu+2 (IM); Cu (Eº for Zn+2 | Zn = -76 V; Eº for Zn+2 | Cu = =0.34 V)
A. -0.076 + 0.34 = -0.42 V
B. +0.34 – (-0.76) = +1.10V

A
156
Q

Calculate the potential of the cell: Zn/Zn(2+) Fe+2(0.01M)/Pt. The standard emf of the cell 1.5328
A. 1.36 V
B. 1.71 V
C. 2.13 V
D. 2.56

A

A. 1.36 V

157
Q

Calculate the value of the potential of the cell. Zn|Zn2+ (1M)IIFe2+ (1M)IPI.
A. 1.53 V
B. 1.24 V
C. 0.77V
D. 2.1V

A
158
Q

What is the potential of the cell –Zn/ Zn2+ (0.1M)// Ag+ (0.01M) / Ag? The standard cell potential is 1.562 V.
A. 0.763 V
B. 1.473 V
C. 0.799 V
D. 0.548 V

A

B. 1.473 V

159
Q

The best conductor of electricity is
A. Gold
B. Silver
C. copper
D. aluminum

A

B. Silver

160
Q

Benzene and toluene from nearly an ideal solution. Calculate the total pressure above a solution having a mole fraction of benzene 0.80. T = 20ºC
A. 40.7 mm
B. 59.6 mm
C. 64.2 mm
D. 70.8 mm

A

C. 64.2 mm

161
Q

Vapor pressure of 2-butyne at 27.2ºC.
A. 760 mmHg
B.400 mmHg
C. 500 mmHg
D.650 mmHg

A

A. 760 mmHg

162
Q

The equilibrium system acetone(1)-acetonitrile(2)-nitromethane(3) at 80ºC at 110 kPa has the overall composition z1=0.45, z2=0.35, z3= 0.20. Assuming that Raoult’s law is appropriate to this system and knowing the vapor pressures at 80ºC of acetone, acetonitrile, and nitromethane are 195.75 kPa, 97.84 kPa, and 50.32 kPa respectively. The mole fraction of vapor in the system is
A. 0.7364
B. 0.2636
C. 0.500
D. 0.97

A

A. 0.7364

163
Q

The equilibrium system acetone(1)-acetonitrile(2)-nitromethane(3) at 80ºC at 110 kPa has the overall composition z1=0.45, z2=0.35, z3= 0.20. Assuming that Raoult’s law is appropriate to this system and knowing the vapor pressures at 80ºC of acetone, acetonitrile, and nitromethane are 195.75 kPa, 97.84 kPa, and 50.32 kPa respectively. The mole fraction of nitromethane in the liquid is
A. 0.2859
B. 0.3810
C. 0.3331
D. 0.1524

A

C. 0.3331

164
Q

Use the Van der Waals equation of state to calculate the pressure exerted by exactly one mole of gaseous ammonia, NH3, held at a temperature of 100 K in a vessel of volume 2.50 dm3. The values of the Van der Waals parameters for ammonia are a = 4.225 atm dm6 mol-2 and b = 3.71 x 10-2 dm3 mol-1
A. 3.33 kPa
B. 3.31 Mpa
C. 1970 Pa
D.224 kPa

A

B. 3.31 Mpa

165
Q

A certain liquid has a viscosity of 1E4 poise and a density of 3.2 g/ml. How long will it take for platinum ball with a 2.5 mm radius to fall 1 cm through the liquid? The density of platinum is 21.4 g/cm2.
A. 4.05 s
B. 25.4 s
C. 33.4 s
D. 48.9 s

A

A. 4.05 s

166
Q

To what height will 68ºF ethyl alcohol rise in a 0.005 in internal diameter glass capillary tube? The density of the alcohol is 49 lb/ft3 and its surface tension s 0.00156 lbf/ft with contact anle of 0º.
A. 4.37 in
B. 3.67 in
C. 3.87 in
D. 1.47 in

A

B. 3.67 in

167
Q

The e.m.f. value for oxidation from H2 at 1.0 atm to H+ at 1.0×10-1 M is
A. 0.00V
B. 0.059V
C. -0.059V
D. 0.030V

A

B. 0.059V

168
Q

The number of electrons necessary to produce 1.00 gm of Cu from Cu2+ at the cathode of an electrolytic cell is
A. 1.89×1022
B. 3.04×103
C. 9.47×1021
D. 1.91×1025

A

A. 1.89×1022

169
Q

When 5.50 g of biphenyl (C12H10) is dissolved in 10 g benzene, the boiling point increases by 0.903ºC. What is the Kb of benzene in K/molal?
A. 2.12
B. 2.53
C. 2.80
D. 3.06

A

B. 2.53

170
Q

Pressure of saturated bromine at 300 ºK in bar.
A. 0.124
B. 0.310
C. 0.680
D. 1.330

A

B. 0.310

171
Q

A 190-cm3 sample of argon gas at 25ºC required 8.5 sec to flow through a 1.00 m tube of 1.0 mm radius. The inlet pressure for the gas was 1.02 bar, and the outlet pressure was 1.007 bar. The volume of the gas was measure at 1.007 bars. What is the viscosity of the gas in Pa-s?
A. 4.6E-6
B. 2.3E-5
C. 8.9E-4
D. 5.1E-3

A

B. 2.3E-5

172
Q

In galvanic cell, there is conversion of
A. Chemical energy to electrical energy
B. The electrical energy to a mechanical energy
C. electrical energy to chemical energy
D. mechanical energy to chemical energy

A

A. Chemical energy to electrical energy

173
Q

A gas deviates most from ideal behavior when it is subjected to
A. Low T and high P
B. High T and high P
C. low T and low P
D. high T and low P

A

A. Low T and high P

174
Q

Calculate the volume that 1.5 mol of (C2H5) 2S would occupy at 105 ºC and 0.75 bar. Assume that Van der Waals constants are; a=19 dmc –bar/mol2 and b=0.1214 dm3/mol.
A. 62 dm3
B. 75 dm3
C. 63 dm3
D. 70 dm3

A
175
Q

The boiling point of the immiscible liquid system naphthalene – water is 98 ºC under a pressure of 733 mmHg. The vapor pressure of water at 98 ºC is 707 mmHg. Calculate the weight % of naphthalene in the distillate.
A. 20.7%
B. 19.5%
C. 18.8%
D. 18.2%

A
176
Q

Calculate the freezing point of a solution containing 4.27 g of sucrose in 50 g water.
A. -0.45 ºC
B. -0.65 ºC
C. -0.76 ºC
D. -0.82 ºC

A
177
Q

One colligative property of solutions is its freezing point depression. Which observation will show that the solute is an electrolyte? ∆tf/m
A. Is not a constant
B. is less than Kf
C. is greater than Kf
D. is not Kf

A

C. is greater than Kf

178
Q

It is the lowest possible temperature of matter.
A. 0 celsius
B. 0 farenheit
C. absolute zero
D. critical zero

A

C. absolute zero

179
Q

Assuming 100% dissociation of the solutes, what would be the freezing point depression for an aqueous solution that is 0.10 m in NaCl and 0.10 m in CaCl2?
A. 0.93ºK
B. -0.93 ºC
C. 1.32 ºC
D. -1.82 ºC

A

A. 0.93ºK

180
Q

If 0.200 liter of 0.100 M NaCl are electrolyzed until the OH- concentration is 0.0500M, how many moles of Cl2 gas are produced?
A. 5.00×10-3 mole
B. 1.00×10-2
C. 5.00×10-2 mole
D. 1×10-1 mole

A

A. 5.00×10-3 mole

181
Q

If aqueous CuSO4 is electrolyzed for one minute with a current of 2.00 ampere, the volume of oxygen produced at STP at the anode is
A. 3.10×10-4 liter
B. 6.96 ml
C. 1.16×10-4 liter
D. 1.16 ml

A

B. 6.96 ml

182
Q

What is the cathode material in the dry cell?
A. Magnesium
B. lead
C. graphite
D. zinc

A

C. graphite

183
Q

One of the difference between the voltaic cell and an electrolytic cell is that in an electrolytic cell
A. The electron flow is toward the anode
B. O2 gas is produced in the cathode
C. An electric current is produced by a chemical reaction
D. A nonspontaneous reaction is forced to occur

A

D. A nonspontaneous reaction is forced to occur

184
Q

In an alkaline dry-cell battery, what chemical replaces the NH4Cl found in the normal dry cell?
A. MnO2
B. KOH
C. Zn
D. NH3

A

B. KOH

185
Q

Which of the following statements is/are correct?
(I) Oxidation occurs at the anode
(II) Reduction occurs at the cathode
(III) A reducing agent is oxidized during a redox reaction

A. I and II only
B. I only
C. III only
D. all

A

D. all

186
Q

The voltage of a galvanic cell does not depend on which of the following parameters?
A. Concentration of solutions
B. Pressure
C. temperature
D. volume

A

D. volume

187
Q

The direction of electron flow is
A. From anode to cathode
B. from cathode to anode
C. either way
D. none of these

A

B. from cathode to anode

188
Q

Oxidation of the solution (or solute) occurs at the
A. Anode
B. cathode
C. neither
D. both

A

A. Anode

189
Q

All the half-cell potential (∆E) use the _____________ as the reference zero point
A. Hydrogen electrode
B. oxygen half-cell
C. carbon half-cell
D. arbitrarily net

A
190
Q

When two batteries of the same rated voltage are connected in series; its new rated voltage will be ________________ the rated voltage of one battery
A. Halved
B. twice
C. the same
D. thrice

A

B. twice

191
Q

When 6 light bulbs are connected in series and one of the bulbs got busted, the rest of the bulb will
A. Still light up
B. not light up
C. be destroyed
D. get busted

A

B. not light up

192
Q

When two batteries of the same rated current are connected in parallel, its new rated current will be _____________ the rated current of one battery.
A. Half
B. twice
C. the same
D. thrice

A

B. twice

193
Q

When Ferro magnets are heated above a critical temperature, its ability to possess permanent magnetism disappears. This temperature is called
A. Curie temperature
B. Coulomb temperature
C. Maxwell temperature
D. ampere temperature

A

A. Curie temperature

194
Q

When 6 light bulbs are connected in parallel and one of the bulbs, the rest of the bulbs will
A. Still light up
B. no longer light up
C. be destroyed
D. get busted

A

A. Still light up

195
Q

10.5 L of N2 at 25ºC and 760 mmHg are bubbled through an aqueous solution of a non-volatile solute, whereby the solution losses 0.2455 g in weight. If the total pressure above the solution is 760 mmHg, what is the mole fraction of the solute in the solvent?
A. 0.982
B. 0.018
C. 0.653
D. 0.347

A

B. 0.018

196
Q

Estimate the height to which water at 21 C will rise in a capillary tube of diameter 3.05 cm. Assume it is clean glass of contact angle 0º and surface tension of 0.0729.
A. 9.75 mm
B. 5.56 mm
C. 7.35 mm
D. 8.67 mm

A

A. 9.75 mm

197
Q

A liquid of density 850 kg/m3 having a surface tension of 0.055 N/m, with rise how far in a glass capillary of 1.4 mm inside diameter?
A. 19 mm
B. 14 mm
C. 5 mm
D. 0.45 mm

A

A. 19 mm

198
Q

Determine the specific gravity of a powder from the following data;
weight of sample in air——————————————————– 3.556 g
weight of pycnometer filled with water————————————- 20.004 g
weight of pycnometer + sample + enough water to fill it————— 21.782 g
A. 1.2
B. 1.8
C. 2
D. 2.4

A

C. 2

199
Q

What is the mass density in kg/m3 of a liquid whose specific weight is 9000 N/m3.
A. 976.7
B. 876.4 kg/ m3
C. 917.43 kg/ m3
D. 768.7 kg/ m3

A

C. 917.43 kg/ m3

200
Q

The specific gravity of N2 at 80ºF and 745 mmHg compared to air at the same condition is in the ratio of
A. 0.97
B. 79
C. 1.23
D. 1.32

A

A. 0.97

201
Q

The specific gravity of an unknown liquid is 1.5, find its density in kg/m3
A. 1000
B. 1500
C. 155
D. 93.6

A

B. 1500

202
Q

A cylindrical glass tube 1.0 cm in lengths is filled with ethanol. The mass of ethanol needed to fill the tube is found to be 9.64 g. Calculate the inner diameter of the tube in cm. (The density of ethanol is 0.78 g/mL.)
A. 3.94 cm
B. 0.0509 cm
C. 0.905 cm
D. 1.02 cm

A

A. 3.94 cm

203
Q

A substance with a specific gravity of 0.5 is _____________ times as dense as water.
A. One-half
B. 2
C. 5
D. 3

A

A. One-half

204
Q

A cube of plastic 1.5 cm on a side has a mass of 1.9 g. What is its density in g/m3?
A. 1.9
B. 0.56
C. 1.78
D. 3.4

A

B. 0.56

205
Q

The density of liquid bromine is 3.12 g/ml. What is the mass of 0.250 L of bromine?
A. 0.780 g
B. 780 g
C. 0.0801 g
D. 80.1 g

A

B. 780 g

206
Q

A spherical ball of lead has a diameter of 5.0 cm. What is the mass in grams of the sphere if l lead has a density of 11.34 g/cm3?
A. 5.9 E3
B. 7.4 E2
C. 5.2 E2
D. 65

A

B. 7.4 E2

207
Q

If a liquid has a specific gravity of 1.01, its density is
A. 10.1 g/ml
B. 1.01 g/ml
C. 1.01 cm3
D. 10.1 cm3

A
208
Q

An iron block weighs 5 Newtons and has a volume of 200 cubic centimeters. What is the density of the block in kg/m3?
A. 800
B. 988
C. 1255
D. 2550

A
209
Q

A typical mud is 70 wt % sand and 30 wt % water. What is it density? The sand is practically pure quartz (SiO2), for which density is 165 lb/ft3.
A. 110.4 kg/m3
B. 110.4 lb/ft3
C. 1769 lb/ft3
D. 1769 kg/L

A

B. 110.4 lb/ft3

210
Q

Calculate the specific weight of water at a place where the acceleration of gravity is 32.2 ft/s2.
A. 7800 N/m3
B. 8680 N/m3
C. 9792 N/m3
D. 1120 N/m

A

C. 9792 N/m3

Day 1 (10 decks)

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