Mixed Subjects 1 Flashcards
What is the molecular weight in amu/g/mol of 11-tetradecynl acetate?
382.4
25.4
195.2
505.8
25.4
Balance the following chemical equation:
_Al + _NH4ClO4 → _Al2O3 + _AlCl3 + _NO + _H2O
3, 1, 3, 1, 3, 6
3, 3, 1, 1, 3, 6
3, 3, 1, 3, 1, 6
3, 1, 1, 1, 3, 6
3, 3, 1, 1, 3, 6
Balancing C2H5SH + O2 → CO2 + H20 + SO
1, 8, 4, 5, 1
2, 7, 4, 4, 2
2, 9, 4, 6, 2
1, 5, 4, 3, 1
2, 9, 4, 6, 2
Balance the equation when ethanol is used as formula one fuel for racing cars, assuming the complete combustion of air.
1,2,4,3
2,3,2,4
4,3,1,2
3,1,3,1
2,3,2,4
Balance the equation
_(NH2) 2CO + _H2O = _CO2 + _NH4 + _OH
1, 1, 2, 1
2, 1, 1, 1
1, 1, 1, 1
3, 2, 2, 1
1, 1, 2, 1
In alkaline chlorination, the indicative reactions are shown below. Balance the equations:
NaCN + NaOH = Cl2NaCNO + NaCl + H2O
NaCNO + NaOH = Cl2NaCl + CO2 + NaHCO3 +H2O
1, 2,1,1,2,1; 2,5,3,6,1,1,1,2
1,1,1,1,1,1; 1,2,3,3,1,1,1,2
2,1,1,1,1,2; 3,5,2,1,6,1,1,4
1,1,2,2,2,1; 3,2,5,5,6,1,1,1
1, 2,1,1,2,1; 2,5,3,6,1,1,1,2
The following reactions is important in lake and river sediments that are devoid of oxygen
SO42- + H+ + CH2O → HS- + CO2 + H2O
Balance this equation.
1, 1, 2, 1, 2, 2
A voltaic cell is represented by the following equation:
Fe(s) + Zn2+(aq) 🡪 Fe2+(aq) + Zn(s)
Which electrode is the anode and which electrode is the cathode?
Anode = Fe and Cathode = Zn
ALEORA CGEROA
Oxidation changes the
charge
Distance from the earth to the most remote known normal galaxies is calculated to be:
9x10^25 m
Mean distance from the equator to the north pole is:
1x10^7 m
Calculate the mass of the Sun using the fact that the period of the Earth’s orbit around the Sun is 3.156x10^7 s and its distance from the Sun is 1.496x10^11 m.
1.99x10^30 kg
What is the theory in two- or three-dimensional collision to be applied when playing billiards and in order to sink the target ball in the corner pocket?
The center of the mass theory where the center of the mass of the system moves as all the mass in the system were concentrated at that point and one of them is initially at rest, and they were in perpendicular direction of the collision.
Proton – proton elastic collision.
The components of momentum in an isolated system in each of the directions (x, y, z) are conserved independently.
Where two equal masses undergo a glancing elastic collision.
Where two equal masses undergo a glancing elastic collision.
When travelling at NLEX at 80 mph, a stopped car in front causes you to suddenly skid to stop. What happened to the kinetic energy of the moving car?
Some of it were converted to internal energy and some transferred to the road and surroundings.
It was transferred to the internal energy of the road.
All of it transferred to the road and surroundings.
All of it are still in the car.
Some of it were converted to internal energy and some transferred to the road and surroundings.
If the age of the Earth is 1.3x1017 years, what is the approximate age of the universe?
5x10^17
If a person breathes 100 breathes per minute and is aged 75, how many breathes will he/she have during his lifespan?
3.942 x 10^9
4.4.923 x 10^-6
5.256 x 10^6
6.044 x 10^-5
3.942 x 10^9
Estimate the number of breaths taken during an average life span.
4x10^8 breaths
6x10^5 breaths
5x10^7 breaths
3x10^6 breaths
4x10^8 breaths
Determine the volume in mL of 1mol of pure
ethyl alcohol.
58 mL
When liquid nitrogen was used to remove warts in human beings, what is the temperature in Kelvin if liquid nitrogen has a freezing point of minus 210 ̊C?
Minus 300K
85K
63K
4.1K
63K
Iodine vapor forms iodine crystals when it touches a cold surface. What is the reverse of the process being described?
sublimation
What is the formula of the ionic compound that is forced between the following ions: lithium and chloride ions; lithium and oxide ions; lithium and nitride ions?
Li3Cl, Li3O2, LiN
Li4Cl2, Li3O3; LiN3N3
Li2Cl2, LiO2, LN3
LiCl, Li2O, Li3N
LiCl, Li2O, Li3N
Find the empirical formula given 5.045 g of C, 0.847 g H and 3.36 g O.
C2H4O
What is the empirical formula and chemical name of an ionic compound used as food additive and dietary supplement if it contains 22.11% manganese, 1.6% hydrogen, 24.92% phosphorus and 51.42% oxygen?
MnHPO3 manganese phosphate
Mn2(HPO)4 dimanganese dihydrogen phosphate
MnH4P2O8 manganese hydrogen phosphate
Mn3(H2PO4)1 tri manganese hydrophosphate
MnH4P2O8 manganese hydrogen phosphate
Determine the organic molecular formula of melamine used in the process of manufacturing formica. It is composed of 28.57% carbon, 4.82% hydrogen and 66.634% nitrogen, and has a molecular mass of 126.122.
(C2H2N2)4
C4H8N4
(C3H3N3)3
(CH2N2)3
(CH2N2)3
What is the organic molecular formula for a certain organic polychlorinated biphenyl similar to chlorinated insecticides if the compound contains 3.95% Carbon, 1.313% hydrogen, and 58.95% chlorine with a molecular mass of 360.89?
C14H8Cl14
C10H8Cl12
C6H2Cl13
C12H6Cl16
C12H6Cl16
Which of the following symbols provides more information about the atom: ²³Na or ₁₁Na?
²³Na
What is the chemical formula of aspirin?
C8H9O3
C8H13O5
C9H8O4
C10H34O
C9H8O4
Which of the following formula is red lead?
PbO
Pb2O4
Pb4O6
Pb3O4
Pb3O4
What is the common name of this compound C6H5OCH3?
Aniline
Cumene
Styrene
Anisole
Anisole
From which plant is capsaicin extracted?
Capsicum
Determine the molecular weights of glucose and urea respectively.
180 amu and 60 amu
Give the technical names of Sc3+, Ti2+ and Sr2+
Transition metal ions
Scandium 3 plus ion; Titanium 2 plus ion; Strontium 2 plus
Scandium (III) ion; Titanium (II) ion; Strontium (II) ion
Scandium 44/31 ion; Titanium 47/22 ion; Strontium 97/38 ion
Scandium (III) ion; Titanium (II) ion; Strontium (II) ion
What is the oxidation number of Cr in the complex ion CrF6 F-ligand?
6
2
3
4
3
Determine the gram molecular weights and equivalent weights of the following: MgCO3; CO2; K2HPO4 and NaNO3. Make the appropriate assumptions
47.8/51.2; 66.4/71.1; 48.5/35; 67.5/46
52.2/65; 134/36; 88/125; 120/55
84.4/42.3; 44.2/22.3; 175/88; 85.2/85.3
86.2/46; 48.1/51.1; 120/101; 96.3/102
84.4/42.3; 44.2/22.3; 175/88; 85.2/85.3
What is the chemical formula of Alar?
C6H12N2O3
Alar 6-12-2-3
Calculate the number of moles of hydrogen ion that is required to form 1.24 moles of hydrogen? What is the mass in grams of zinc to form 0.621 mole of hydrogen?
None of these
2.44 moles hydrogen; 40.6 grams zinc
4.88 moles hydrogen; 60.3 grams zinc
1.22 moles hydrogen; 60.3 grams zinc
2.44 moles hydrogen; 40.6 grams zinc
Calculate the mass of titanium in kilograms in 0.4011 million grams of TiCl4.
101
The two Br isotopes 79 Br and 81 Br, each has a natural abundance of about 50%. Determine what is the likely molecular weight of Br2.
162 amu
160 amu
158 amu
All are equally like
160 amu
How many moles of beryllium would a 43.1lb sample of pure aquamarine with formula Be3Al2(SiO3)6 contain?
3.2x10^3 mol
1.1x10^2 mol
4.53 mol
5.38x10^3 mol
1.1x10^2 mol
Determine the number of grams of C2H5N that will heat with 81.81 g of oxygen in the equation:
C2H5N + O2 🡪 CO + H2O + NO
40 g
When 12 grams of carbon (s) are mixed with 64.2 grams of O2 (g), calculate how many grams of CO2 will be formed:
12 grams CO2
64 grams CO2
32 grams CO2
44 grams CO2
44 grams CO2
3 moles of glucose processes how many moles of lactate?
6
Determine the volume of carbon dioxide in cubic feet occupied by 120 lbs at a pressure of 1.5 atm.
750
To which subatomic particle does each statement refer to a.) has a positive charge; b.) is found outside of the nucleus; c.) has the smallest mass; d.) has a negative charge?
proton, electron, electron, and electron
What is the smallest unit that retains the physical properties?
Atom
The element that is in Group 14 and the fourth period is:
Germanium
Iron
Gallium
Manganese
Germanium
Determine which of the following will float or sink in water: balsa wood, ethylene glycol, table salt, ethanol
float, float, float, float
float, sink, sink, float
sink, float, sink, float
sink, sink, sink, sink
loat, sink, sink, float
Determine the number of neutrons of the radioactive isotope C14.
14
8
6
12
8
Which of the following devices is/are sensitive enough to measure (the intensity – not sure if
this was mentioned in the problem) of ionizing radiation?
Film Badge
Geiger Counter
Geiger Counter and Scintillation Counter
Film Badge, Geiger Counter, and Scintillation Counter
Geiger Counter and Scintillation Counter
Author of Octet Rule
Gilbert Lewis
The theory of resonance was developed by __ in order to further explain the bonding structures of molecules or ions not covered by the Lewis Octet rule.
Alfred Nobel
Le Chatelier
Linus Pauling
Emmanuel Kroop
Linus Pauling
Which compound is formed by the reaction of malonic acid and urea with a catalyst, as discovered by Adolf von Baeyer?
Barbituric Acid
What was the method used by Friedrich Wöhler to break the vital force theory in nature?
Combining organic compounds with inorganic compounds
Heating ammonium nitrate to form ammonia and water
Heating ammonium cyanate to form urea
Carbon dioxide and water to form glucose
Heating ammonium cyanate to form urea
Wohler urea
Who discovered EDTA?
Ferdinand Munz
The Nobel Prize for radioactivity discovery was shared between Curie and Roentgen. Who coined the word “Serendipity” in 1754?
Horace Walpole
HWS Horace Walpole Serendipity
Who invented vulcanized rubber?
Charles Goodyear
Who is the father of Quantum Theory?
Max Planck
Who discovered x-ray?
Wilhelm Conrad Roentgen
What was Melvin Calvin was known for his study of?
photosynthesis
What discovered Deuterium?
Harold C. Urey
HUD Harold Urey Deuterium
Father of nuclear chemistry and discovered proof of nuclear fission.
Otto Hann
Who discovered carbon dating?
Willard Libby
Who first created the periodic table?
Dmitri Mendeleev
He established the Theory of Valency.
Edward Frankland
What are the two elements discovered by Pierre and Marie Curie?
Polonium and Radium
In an experiment it was found that the total charge on an oil drop was 5.93x10^-18 C. How many negative charges does the drop contain?
18
44
23
37
37
Define the relationship between the number of electrons in the valence shell and the number of covalent
bonds it forms:
1. Carbon
2. Nitrogen
3. Oxygen
4. Hydrogen
C = 4 electrons, 4 bonds; N = 5 electrons, 3 bonds; O = 6 electrons, 2 bonds; H = 2 electrons, 2 bonds
C = 5 electrons, 2 bonds; N = 6 electrons, 4 bonds; O = 3 electrons, 1 bond; H = 2 electrons, 3 bonds
C = 6 electrons, 13 bonds; N = 4 electrons, 2 bonds; O = 2 electrons, 1 bond; H = 2 electrons, 1 bond
C = 2 electrons, 4 bonds; N = 3 electrons, 3 bonds; O = 2 electrons, 2 bonds; H = 4 electrons, 3 bonds
C = 4 electrons, 4 bonds; N = 5 electrons, 3 bonds; O = 6 electrons, 2 bonds; H = 2 electrons, 2 bonds
Estimate the energy emitted per photon as well as the quantity of photons emitted per second from a one hundred watt yellowlight bulb with y = 550 nm and a one kilowatt microwave source with y = cm emitting 1.99 x 10^-23 J per photon and 5.03 x 10^25 photons/sec/
3.60 x 10^-19 J and 2.77 x 10^20 photons /sec
2.620 x 10^-18 J and 3.11x 10^21 photons /sec
3.91 x 10^-20 J and 4.22 x 10^19 photons /sec
4.11 x 10^-20 J and1.67 x 10^20 photons /sec
3.60 x 10^-19 J and 2.77 x 10^20 photons /sec
Define gas
It is a state of matter with definite shape and volume
It is a state of matter with definite shape but without definite volume
It is a state of matter without definite shape and volume
It is a state of matter without definite shape but with definite volume
It is a state of matter without definite shape and volume
Assuming that air at sea level is composed of 20% oxygen and 80% nitrogen, determine the pressure and air composition on top of Mount Everest at 0 ̊C and air altitude of 29143 ft.
0.299bar, yO2=0.179, yN2=0.866
0.516bar, yO2=0.236, yN2=1.021
0.333bar, yO2=0.177, yN2=0.823
0.411bar, yO2=0.187, yN2=0.911
0.333bar, yO2=0.177, yN2=0.823
An adiabatic process is one in which the system under investigation is thermally isolated so that there is no exchange of heat with the surroundings. Thus, the work done on a closed system in an adiabatic process is _____.
Equal to zero
Not equal to the exchange of heat with surroundings
Equal to the increase in internal energy of the system
Not equal to the increase in internal energy of the system
Equal to the increase in internal energy of the system
Calculate the net and gross heats of combustion of for methane gas.
-491 kJ/mol; -998 kJ/mol
-362 kJ/mol; -731 kJ/mol
-891 kJ/mol; -802 kJ/mol
-598 kJ/mol; -1120 kJ/mol
-891 kJ/mol; -802 kJ/mol
If 5 grams of methane gas is burned at constant pressure, determine the heat released in kJ if the change in entropy accompanied the reaction is -890 kJ.
-360.00 K
-278.12 K
-250.01 K
-192.00 K
-250.01 K
If one mole of an ideal gas is kept at 0 degC, during an expansion from 3 L to 10 L, how much work is done as the gas during the expansion?
-2.2x10^4 J
-2.7x10^3 J
-5x10^3 J
-7.8x10^5 J
-2.7x10^3 J
A certain gas confined in a cylinder by a piston, where the initial pressure in the system is 7 bar and the volume is 0.11 cubic meter. The piston is held in place by latches and the apparatus is in vacuum. Determine the change in energy when the latches are removed suddenly and the gas expands to double its initial volume and the piston strikes the latches at the end of the process.
11.54 kJ
0.59 kJ
0.77 kJ
no change
no change
Define entropy.
Entropy is a function of the state of the system and determines whether a physical change or chemical reaction can occur spontaneously in a closed system;
Entropy is the opposite of enthalpy.
Entropy determines the time required for a reaction to proceed and complete.
All of these
All of these
Determine whether the changes in entropy (delta S) and enthalpy (delta H) are POSITIVE, NEGATIVE or near ZERO:
a) Ethyl alcohol evaporating from glass container
b) A diatomic molecule dissociates into atoms
c) Charcoal is burned to form CO2 and water
a) ΔH>0, ΔS>0; b) ΔH>0, ΔS>0; c) ΔH>0, ΔS>0
a) ΔH<0, ΔS<0; b) ΔH>0, ΔS<0; c) ΔH>0, ΔS<0
a) ΔH>0, ΔS<0; b) ΔH<0, ΔS>0; c) ΔH>0, ΔS>0
a) ΔH<0, ΔS>0; b) ΔH<0, ΔS<0; c) ΔH<0, ΔS<0
ΔH>0, ΔS>0; b) ΔH>0, ΔS>0; c) ΔH>0, ΔS>0
Choose a process/es that occur/s with decrease in entropy
freezing of water
dissolving salt in water
boiling of water
sublimation of dry ice
freezing of water
What is the significance of colligative property in physical chemistry?
It refers to the freezing point depression, boiling point elevation, osmotic pressure and lowering of the vapor pressure by a nonvolatile solute
It refers to the temperature, pressure and energy of fusion of volatile solutes in phase equilibrium
It refers to the non-existence of pressure among molecules within the solute
It refers to the temperature differentials exhibited by non-volatile solutes in reactions
It refers to the freezing point depression, boiling point elevation, osmotic pressure and lowering of the vapor pressure by a nonvolatile solute
Determine the boiling and freezing points; vapor pressure at 23 degC of pure benzene, and a solution of benzene in 1.202 g of naphthalene in 25.63 g benzene; the molality and osmotic pressure of the solution.
75 degC, 1.6 degC, 82.1 mmHg, 0.247 M, 6.3 atm
91 degC, 5.0 degC, 102.0 mmHg, 0.432 M, 9.0 atm
none of these
81 degC, 3.6 degC, 83.6 mmHg, 0.320 M, 7.78 atm
81 degC, 3.6 degC, 83.6 mmHg, 0.320 M, 7.78 atm
State Le Chatelier’s Principle.
Le Chatelier’s principle states that when a stress is placed on a system in equilibrium, the system tends to change in a way that relieves the stress.
All of these
Examples of the application of Le Chatelier’s principle are blowing your breath through a straw and dissolving alka seltzer tablet in a glass of water.
Le Chatelier’s principle explains both the formation and decomposition of acids, where anything that might act to increase the concentration of an acid would produce an increase in the other components so as to keep the numerical
Le Chatelier’s principle states that when a stress is placed on a system in equilibrium, the system tends to change in a way that relieves the stress.
If the temperature at the beginning of the compression process of an air standard Otto cycle is 27 degC at a compression ratio of 8, pressure at 101.1 kPa and cylinder volume of 566.2 cm^2, determine the (1) the thermal efficiency; (2) the mean effective pressure, using the PG model for air, Maximum, temperature during the cycle is 1,727 decC, (3) if the IG model was used, find the answers.
56.5%, 710.2 kPa; 51%, 806 kPa
43.2 %, 620.5 kPa; 61% 906 kPa
58.5%, 750.2 kPa; 71%, 760 kPa
65.8%, 810.6 kPa; 81%, 660 kPa
56.5%, 710.2 kPa; 51%, 806 kPa
Otto cycle:
η = 1 - 1/(r^γ - 1)
r = 8, γ = 1.4
η = 1 - 1/(8^1.4 - 1)
η = 0.5647 = 56.5%
An ideal gas undergoes a constant pressure expansion until it reaches an initial temperature of 300 K. Then it undergoes a constant volume cooling where its pressure is reduced to ¼. Calculate the work done.
-1.87 kJ
1) T1 = 300 K P1
2) T2 P1
3) T3 = 300 K P3 = P1/4
T3/T2 = P3/P2
300/T2 = P1/4 / P1
T2 = 75
W = -P(V2-V1)
W = -R(T2-T1)
W = -8.314(75-300)
W = 1870 J
W = 1.87 kJ
For an ideal gas mixture at constant temperature and pressure, the fugacity ______ with increase in mole fraction
Increases
Decreases
Remains unchanged
Cannot be determined
Increases
An Erlenmeyer flask has an egg on its beak and is put to a bath of liquid nitrogen. What happens to its pressure?
decreases
Which of the following shows the relationship between Volume and Temperature at constant pressure for ideal gas?
Charle’s Law
Which temperature scale is defined as a fraction of the triple point of water?
Kelvin
What is the main purpose of Joule-Thomson Effect?
Cooling
Convert 240 000 bbl oil to
liters.
3.8 x 10^7 L
The heating of air inside a balloon is best explained by which
gas law?
Avogadro’s Law
Gay-Lusaac’s Law
Ideal Gas Law
Charle’s Law
Charle’s Law
Which material is best used for
protection against beta emission?
Aluminum
Lucite
Lead
Steel
Lucite
Which layer of the atmosphere can the ozone be located?
Stratosphere
Which subatomic particle carries/determines the chemical properties of an element?
Electron
In redox reactions, which property changes when oxidation occurs?
Charge
Which of the following instruments are used for detecting ionizing radiation at an instant?
Film badge, scintillation counter
Scintillation counter, Geiger counter
Film badge, scintillation counter, Geiger counter
Film badge, Geiger counter
Scintillation counter, Geiger counter
Determine the oxidation number of chromium in 𝐶𝑟𝐹₆³⁺
3
Balance the oxidation reaction of Butane.
_C4H10 + _O2 –> _CO2 + _H2O
2,13,8,10
Which sector uses the most of freshwater supply in United States?
Industry, Farmer, Residential
IFR
What is a buckyball?
A fullerene
What is the following is the formula of buckyball?
C60
