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Coaching Series > COACHING DAY 1 > Flashcards

COACHING DAY 1 Flashcards

1
Q

The person’s sense of smell and taste depend on
specific biochemic receptors present in a person’s nose and mouth. In 2004, a Nobel Prize was given to the researchers who established this fact and
identified the the type of organic compound associated with the sense of smell and taste. The chemical identified was

A

RHODOPSIN

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2
Q

The distance of the Earth to the most remote normal galaxy is calculated to be?
(kulang given kaya memorize)

A

2x10^22m

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3
Q

Determine the oxidation number of Chromium in CrF6^3+

A

3 (three)

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4
Q

Fatty acids such as Lauric acid and Palmitic acid and Oleic acid are long unbranched carboxylic acids consisting of 12 to 20 carbon atoms.

Which type of fatty acids should people avoid ingesting, saturated or unsaturated and why?

A

Saturated, because the risk of cardiovascular disease is increased

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5
Q

A voltaic cell is represented by the following equation Fe(s) + Zn^2+(aq) —–> Fe^2+(aq) + Zn(s)

Which electrode is anode and which is a cathode?

A

Anode=Fe
Cathode=Zn

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6
Q

What other particle is formed in the fusion of the two protons to yield deuterium?

A

positron

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7
Q

Which isotope is produced when Polonium-216 decays by emitting an alpha particle followed by two beta particles?

A

Polonium-212

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8
Q

The process of breaking down a large isotope into smaller isotopes.

A

nuclear fission

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9
Q

In a dehydration reaction where water is lost, an organic compound C3H80 reacts with concentrated phosphoric acid and a product is formed. This product rapidly decolorized a solution of bromine in tetrachloroethane.

What is the product?

A

Propene

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10
Q

When formic acid is 4.6% ionized in 0.105M of aqueous solution at room temperature, determine the ionization constant of the acid. If the solution contains 0.25N of 25mL acid is diluted to 202mL and titrated with 0.35 NaOH, calculate the pH value and the concentration of the hydrogen ion at the equivolume part.

A

2.2x10^-4 and 8.06 and 8.7x10^-9

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11
Q

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

A

Equal to the increase in the internal energy of the system.

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12
Q

State Le Chatelier’s Principle

A

Le Chateliers Principle states that when stress is placed on a system in equilibrium, the system tends to change in a way that relieves the stress.

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13
Q

The ion that would be isoelectronic with the noble gas xenon is

A

I-

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14
Q

In order to describe the intensive state of a system at equilibrium, specify the degrees of freedom for a one phase, two phase, three phase system.

A

F=2, F=1, F=0

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15
Q

Determine the volume of carbon dioxide in cubic feet occupied by 120lbs at a pressure of 1.5 atm
(hindi given ang temperature which is 313.5K) “memorize answer”

A

750 ft^3

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16
Q

If radon-222 disintegrates to a stable condition by emitting three alpha emissions and two beta emissions, determine the stable nucleus formed.

A

(Lead) Pb-210

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17
Q

These compounds are formed by the reaction of acids with alcohols

A

Esters

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18
Q

Determine the number of days it will take for one milligram of rubidium to decay to 0.6.
(kulang given so memorize)

A

63 days

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19
Q

To which subatomic particles does each statement refer to:
a) has a positive charge
b) is found outside the nucleus
c) has the smallest mass
d) has a negative charge

A

P,E,E,E (Proton, Electron, Electron, Electron)

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20
Q

How many moles of beryllium would be a 43.1 lb sample of pure aquamarine with the formula Be3Al2(SiO3)6 contain?

A

1.1x10^2 mol

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21
Q

Determine the empirical formula f of an ionic compound used as a food preservative and contains 24.21% sodium, 33.7% sulphur, and 42.1% oxygen.

A

Na2S2O5

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22
Q

If a person breathes 100 breathes per minute and is aged 75, how many breathes will he/she have during his lifespan.

A

3.942x10^9 breathes

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23
Q

In a gas mixture containing 100mg/L H2S
gas at 25 ̊C and 1atm, determine the partial
pressure exerted by the gas.

A

0.0719 atm

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24
Q

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 210C

A

63.15 K

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25
Q

What is the Clapeyron Equation?

A

It postulates that if the temperature and pressure are both changed in such a way as to keep the chemical potentials of two phases equal to each other, the rates of change are given by the equation.

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26
Q

Applying the Gibbs phase rule in the degrees of freedom, determine the number of degrees of freedom:
1. Liquid water in equilibrium with its vapor
2. Liquid water in equilibrium with a mixture of water vapor and nitrogen
3. A liquid solution of alcohol in water in equilibrium with its vapors

A

F=1, F=2, F=2

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27
Q

Which would make a more efficient cold compress, ethanol or methanol

A

Methanol

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28
Q

As a result of the Aykhal Crystal Denotation in 1974 (in the former Soviet Union), cesium-137 was measured (in 1993) in the soil concentration of 2x104 Bq/kg soil. If the background concentration of 137Cs is 0.5 Bq/kg soil, how many years will it take before the concentration of 137Cs reaches background levels? The decay of radionuclide occurs by a first-order reaction. Half-life is 30 years.

A

459 years

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29
Q

Calculate the mass of titanium in kilograms in 0.4011 million grams of TiCl4.

A

101kg

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30
Q

What is the empirical formula of a sample of cement found to contain 14.21 grams of molybdenum and 8.31 grams of silicon

A

MoSi2

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31
Q

Give the technical name of Sc^3+, Ti^2+, Sr^2+

A

Scandium (III) ion; Titanium (II) ion; Strontium (II) ion

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32
Q

Name the major physiologically active substances that come from:
1. bark of willow tree
2. the pituitary gland
3. the sap of the poppy
4. the belladenna plant.

A

Salicilin, Beta-endomorphin, opium, atropine

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33
Q

Draw the condensed and skeletal structures of diethyl ether which is used by the most doctors and hospitals as an anesthetics during operations.

A

C2H5OC2H5

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34
Q

The element Neon was discovered in 1898 by:

A

Travers and Ramsey

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35
Q

Determine the final volume of 0.51 M KBr when
the starter volume is 100 mL. From a 50 mL
solution of 0.25 M alanine, what volume will be
required using 0.11 M alanine.

A

196 & 114mL

36
Q

A falling raindrop initially has no dissolved oxygen.
The saturation concentration for oxygen in the drop of water is 9.20 mg · L−1 . If, after falling for 2 s, the droplet has an oxygen concentration of 3.20 mg · L−1,how long must the droplet fall (from the start of the fall) to achieve a concentration of 8.20 mg · L−1? Assume that the rate of oxygen exchange is first-order.

A

10.4 s

37
Q

Glutamic acid is used as one of the reagents for a standard to check the BOD test. Determine the theoretical oxygen of 150ppm of glutamic acid.

A

212 ppm

38
Q

A water contains 100.0 mg · L−1 CO2−3 and 75.0 mg · L−1 HCO−3 at a pH of 10 (T =25◦C). Calculate the exact alkalinity. Approximate the alkalinity by ignoring the appropriate chemical species.

A

233 mg/L as CaCO3

39
Q

If the 3-day BOD of a waste is 75 mg/L and
the BOD decay constant, k = 0.345/d, what
is the ultimate BOD?

A

116 mg/L

40
Q

A waste is being discharged into a river that
has a temperature of 100C. What fraction of
the maximum oxygen consumption has
occurred in 4 days if the BOD rate constant
k, determined in the laboratory under
standard conditions is 0.115/d?

A

0.12

41
Q

The BOD of a wastewater sample is
estimated to be 180 mg/L. What volume of
undiluted sample should be added to a 300-
mL bottle? Assume that 4 mg /L BOD can
be consumed in the BOD bottle.

A

7 ml

42
Q

What is the BOD5 of the wastewater sample
if the DO values for the blank and diluted
samples after 5 days are 8.7 and 4.2 mg/L,
respectively?

(connected to the previous problem Vw=7mL)

A

192 mg/L

43
Q

Compute the theoretical NBOD of a
wastewater containing 30 mg/L of ammonia
as nitrogen. If the wastewater analysis was
reported as 30 mg/L of ammonia (NH3), what would the theoretical NBOD be?

A

137mg/L and 113mg/L

44
Q

The town of Aveta discharges 17,360 m3
/day of treated wastewater into the Tefnet Creek. The treated wastewater has a BOD5 of 12 mg/L and a BOD decay constant, k, of 0.12 day−1 at 20◦C. Tefnet Creek has a flow rate of 0.43 m3 /s and an ultimate BOD, Lo , of 5.0 mg/L. The DO of the river is 6.5 mg/L and the DO of the wastewater is 1.0 mg/L. Compute the DO and initial ultimate BOD, Lo, after mixing.

A

4.75 mg/L and 12 mg/L

45
Q

Given the following data for Marikina River and Pasig River, determine the best combination of plant and location to conserve the environment.

A

Plant B in Marikina River ( Choose the highest DO)

46
Q

The following mineral analysis was reported for a water sample taken from well No. 1 at the Eastwood Manor Subdivision near McHenry Illinois (Woller andSanderson, 1976a). Well No. 1, Lab No. 02694, November 9, 1971). (Note: All reported as mg/L as the ion unless stated otherwise.) Determine the total, carbonate and non-carbonate hardness (in mg/L as CaCO3) using the predominant polyvalent cation

A

TH=332.8, CH-284.0, NCH=48.8

47
Q

The design flow and overflow rates for a
settling tank are 0.044 m3 · s −1 and 20 m · day−1, respectively. Determine the surface area of this tank. Determine the length of the tank, using conventional wisdom for length-
to-width ratios. Determine the tank depth,
assuming a detention time of 2 hours

A

Area =190m^2
Length = 16m
Depth = 1.7 m

48
Q

Given the following temperature and
elevation data, determine the stability of the
atmosphere.

Elevation (m) = 2 & 324
Temperature (C) = 14.35 & 11.13

A

-1C, neutral

49
Q

What is the buckyball

A

Fullerene

50
Q

A power plant in a college town is burning coal on a cold, clear winter morning at 8:00 A.M. with a wind speed of 2.6 m · s −1 measured at 30 m elevation and an inversion layer with its base at a
height of 697 m. The effective stack height is 30 m. Calculate the distance downwind XL at which the plume released will reach the inversion layer and begin to mix downward

A

5.8 km

51
Q

A town of 20,000 in Laguna generates 0.96 kg/(capita)-day of MSW. A town of the same size in the Makati City in Metro Manila generates 1.9 kg/(capita)-day of MSW. How much MSW is generated in each town? How many trucks would be needed to collect the waste twice weekly? The trucks each have a capacity of 4.5 MT and operate 5 days per week. Assume that the trucks average two loads per day at 75% capacity. Calculate the number and volume of MSW in tons that enter the landfill

A

19,100 kg/day and 39,000 kg/day
4 trucks and 8 trucks
58m^3/d and 105m^3/d

52
Q

Determine the area required for a new
landfill site with a projected life of 30 years
for a population of 250,000 generating 2.02 kg per capita per day. The density of the compacted waste is 470 kg/m3 . The height of the landfill cannot exceed 15 m.

A

78.4 ha

53
Q

Calculate the volumetric flow rate of leachate through a compacted clay liner if the area of the landfill is 15 ha and the liner thickness is 1 m. The hydraulic conductivity is 7.5 × 10−10 m · s−1. Assume that the head of water is 0.6 m.

A

6.75x10^-5 m^3/s

54
Q

The Nairyosangha landfill located in Peshdadians
serves a population of 562,400 people generating MSW at a rate of 1.89 kg · capita−1· day. The volume of the landfill is 11,240,000 m3. At the present time, 63% of the landfill is used. The ratio of cover to compacted fill is 1.9. Determine projected life remaining for the landfill. Assume the density of the compacted waste to be 490 kg · m−3

A

2.76 years

55
Q

A landfill with a gas collection system is in operation and serves a
population of 200,000. MSW is generated at a rate of 1.95 kg ·
(capita)−1
· day−1
. Gas is produced at an annual rate of 6.2 L · kg−1 of MSW delivered to the landfill. The gas contains 55% methane. Gas recovery is 15% of that generated. The heat content of the landfill gas is approximately 17,000 kJ · m−3 (a value lower than the theoretical value because of dilution of the methane with air during recovery). The landfill company and a developer have proposed to build a subdivision in the vicinity of the landfill and pipe the methane generated to the homes to be used for heating. The homes are estimated to use an average of 110 × 10^6 kJ of heat energy each year. Peak usage during winter is 1.5 times the average usage. How many homes can be built in the subdivision?

A

7 homes

56
Q

A solution of calcium chloride is prepared in
a 1 L volumetric flask. A 60-g sample of
CaCl2 is added to a small amount of water in
the flask, and then additional water is added
to bring the total volume of the solution to 1
L. What is the concentration of calcium
chloride in units of molarity?

A

0.5406 M

57
Q

A solution of HOCl is prepared in water by
adding 15 mg HOCl to a volumetric flask,
and adding water to the 1-L mark. The final
pH is measured to be 7.0. What are the
concentrations of HOCl and OCl? What
percent of the HOCl is dissociated? Assume
the temperature is 250C.

A

[OCl-]=6.39x10^-5M, [HOCl]=2.22x10^-4M, 22.4%

58
Q

The concentration of carbon dioxide in water
at 200C is determined to be 1x10-5 M. The
Henry’s constant for carbon dioxide
dissolution in water is 3.91x10-2 M/atm at
200C. What is the partial pressure of the
CO2 in the air?

A

2.56x10^-4 atm

59
Q

You are working in a site where a leaking underground storage tank has contaminated the soil and groundwater was analyzed and the concentrations of benzene and methyl tertiary butyl ether (MTBE) were found to be 45 and 500 micro grams per liter, respectively. At the soil temperature (100C) the dimensionless Henry’s constants, H for benzene and MTBE are 0.09 and 0.01, respectively. Calculate the soil vapor concentrations of both chemical compounds.

A

Benzene=0.36 micrograms/L
MTBE=5 micrograms/L

60
Q

A solution that gives a crimson red flame. this flame test is a confirmatory test for:

A

Sr^2+

61
Q

What is the color of nickel chloride

A

Yellow

62
Q

Substances whose solution changes color due to pH change.

A

Indicator

63
Q

It is an organic reaction that converts alcohol into an alkyl chlorine using triphenylphosphine and carbon tetrachloride.

A

Appel Reaction

64
Q

It is the major component of lechitin

A

Phosphatidylcholine

65
Q

Polymer used in bulletproof vest

A

Linear Polyethylene

66
Q

Author of the Octet rule

A

Gilbert Lewis

67
Q

Which of the following indicators is used in EDTA titrations?

A

(All of these): Solochrome, Calmagite, Eriochrome Black T.

68
Q

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.

A

Linus Pauling

69
Q

Taurine, a Beta amino acid belongs to the acidic group of:

A

-SO2OH

70
Q

In a standard chemical reaction, rate is governed by the relationship rate=pze-E/RT, where p and z refer to the probability that reacting molecules make a favorable encounter. To increase the probability of reaction, enzymes are employed. Based on the above equation, if E is the activation energy, which is more favorable and why? A lower or hgher E?

A

Lower E so that a proton can be donated or stolen for the reactants leading to better catalyst.

71
Q

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 29143ft.

A

0.333 bar, yO2= 0.177, yN2= 0.823 (kung saan sa choices ang mag equal sa 1)

72
Q

One mole of A at one bar and one mole of B
at 2 bar are separated by a partition and
surrounded by a heart reservoir. Determine
the change in entropy when partition is
withdrawn.

A

12.50 J/K/mol

73
Q

Determine the number of moles of
an unknown base in a solution
when titrated with 0.150 M HCl and
22.01ml of acid were needed to
reach the end point of the titration.

A

3.30x10^-3 mL

74
Q

The coexistence curve where the plot of pressure versus temperature along which the two phases coexist was shown by Clausius-Clapeyron. What did Clausius postulate?

A

(Katong taas) A. The Clapeyron equation was simplified by assuming that the vapor obeys the ideal gas law and by neglecting the molar volume of the liquid VL in comparison with the molar volume of the gas VG

75
Q

What is the significance of colligative property in physical chemistry

A

It refers to the freezing point depression, boiling point elevation, osmotic pressure and lowering of the vapor pressure by a nonvolatile solute

76
Q

Determine the pH of 0.21 M solution of
sodium benzoate in water at room
temperature.

A

8.74

77
Q

In the collision theory of chemical kinetics, it is suggested that reaction rate is governed by the relationship rate=Pze-E/RT. What can an enzyme do to the activation energy of the reaction E?

A

Enzymes provide an alternative reaction pathway in lowering the energy level of the reaction

78
Q

Identify the organic compounds in the following
equation:
CH3CH(OH)CH2CHO → CH3CH=CH + H2O

A

carbonyl aldehyde; cis or trans-isomer

79
Q

In the study of fats and lipids, determine which of the two triglycerides has a higher melting point Substance A containing only lauric acid and glycerol, or substance B-containing only stearic acid and glycerol?

A

Stearic cid has a higher melting point than Lauric acid

80
Q

What is the theory in two or three dimensional collisions to be applied when playing billiard balls and in order to sink the target ball in the corner pocket?

A

Where two equal masses undergo a glancing elastic collision.

81
Q

When Thorium-230 atom undergoes alpha decay, the products of the reaction are usually:

A

Radium and an Alpha Particle

82
Q

Balance the following equation:
225Ac82 = ? + 4He2
when one alpha particle is lost from
actinium.

A

225Ac89 = 221Fr87 + 4He2

83
Q

A certain solid compound was tested in a
laboratory and was analyzed to contain 6.5%
hydrogen, 42.2% carbon, and 5.5% oxygen,
with a molecular weight of approximately 341.2.
Determine the chemical formula.

A

C12H12O11 (closest molecular weight)

84
Q

When travelling at NLEX at 80mph, a stopped car in front causes you to suddenly skid to stop. What happened to the kinetic energy of the moving car?

A

All of it transferred to the road and surroundings

85
Q

Are reversible processes frictionless? why?

A

Because when reversed, retraces its forward path and restores the initial state of the system and the surroundings

86
Q

What is the Nujol Mull in organic chemical reactions?

A

It is a mass spectrum technique and is obtained by grinding up a solid which is mixed with mineral oil to form a suspension for IR sectroscopy

87
Q

Determine the:
1. Moles of analyte
2. Volume of titrant to reach end point
3. pH at the start, halfway and at the endpoint for each of the titrations performed. For the titration shown as follows: 50mL of a weak base (pKb=5), 0.072M with 0.153M HCl

A

3x10-3mol; 24mL; 10.84, 8.82, 5.06

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