Day 1: Physical and Chemical Principles Auxesis Review Center Flashcards by Nuñez Ronnie

In 1986, the nuclear reactor in Chernobyl had an accident and spewed
radioactive nuclei that were carried by the winds for hundreds of
miles. Today, among the child survivors of the event, the most common
damage is thyroid cancer. Which radioactive nucleus do you expect to
be responsible for these cancers?
a. I-131 c. I-123
b. I-129 d. I-125

a. I-131

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Which of the following objects are chiral?
a. pair of scissors
b. beaker
c. paper clip
d. the swirl created in water as it drains out of a sink or bathtub

a. pair of scissors

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Perchloroethylene, which is a liquid at room temperature, is one of
the most widely used solvents for commercial dry cleaning. It is sold
for this purpose under several trade names, including Perclene. Does
this molecule have polar bonds? Is it a polar molecule? Does it have a
dipole?
a. yes, non-polar, yes c. no, non-polar, none
b. no, non-polar, yes d. yes, non-polar, none

d. yes, non-polar, none

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You place manganese, calcium chloride and sodium acetate in a liquid,
in which they are not soluble. The liquid has a density of 2.15 g/ml.
Which will sink to the bottom, which will stay on the top, and which
will stay in the middle of the liquid?
a. manganese, sodium acetate, calcium chloride
b. calcium chloride, manganese, sodium acetate
c. calcium chloride, sodium acetate, manganese
d. manganese, calcium chloride, sodium acetate

a. manganese, sodium acetate, calcium chloride

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In photosynthesis, how many grams of CO2 are required to produce 5.1 g
of glucose?
a. 8.8 kg c. 6.3 kg
b. 7.5 kg d. 9.6 kg

b. 7.5 kg

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Classify these as kinetic or potential energy
(1) Water held by a dam
(2) A speeding train
(3) A book on its edge before falling
(4) A falling book
(5) Electric current in a light bulb
a. kinetic, kinetic, potential, kinetic, kinetic
b. kinetic, kinetic, potential, kinetic, potential
c. potential, kinetic, potential, kinetic, potential
d. potential, kinetic, potential, kinetic, kinetic

d. potential, kinetic, potential, kinetic, kinetic

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We heat 50.0 g of an unknown substance by adding 205 cal, and its
temperature rises by 7.0°C. Identify the substance.
a. water c. benzene
b. ethanol d. acetic acid

b. ethanol

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What process combines rubber and sulfur at a high temperature?
a. fulmination c. fermentation
b. vulcanization d. distillation

b. vulcanization

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Who invented the Carbon-14 dating method?
a. Irving Langmuir c. August Hofmann
b. Williard Libby d. Otto Hahn

b. Williard Libby

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Which of the following formula is red lead?
a. PbO c. Pb2O4
b. Pb4O6 d. Pb3O

d. Pb3O

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Suppose that the yield of aspirin by the reaction is 75%. How many
grams
of salicylic acid would be required to give an actual yield of 25.0 g
of aspirin?
a. 43 g c. 26 g
b. 12 g d. 35 g

c. 26 g

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. Predict which of these ionic compounds are soluble in water:
(1) MgCl2 (4) NH4NO3
(2) CaCO3 (5) Pb(OH)2
(3) Na2SO3
a. soluble, soluble, soluble, soluble, soluble
b. soluble, insoluble, soluble, soluble, insoluble
c. soluble, insoluble, insoluble, soluble, insoluble
d. soluble, insoluble, insoluble, soluble, insoluble

d. soluble, insoluble, insoluble, soluble, insoluble

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Polymer used in bullet proof vest
a. linear polyethylene c. polycarbonate
b. polyacrylonitrile d. polymethyl acrylate

d. polymethyl acrylate

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Determine the BOD rate constant (in base e).
a. 0.42/day c. 0.51/day
b. 0.36/day d. 0.23/day

b. 0.36/day

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Determine the ultimate BOD.
a. 130 mg/L c. 170 mg/L
b. 140 mg/L d. 190 mg/L

a. 130 mg/L

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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?
a. Fe, Zn c. Fe, Fe
b. Zn, Fe d. Zn, Zn

a. Fe, Zn

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The only natural amino acid that has no chiral center is:
a. Cysteine b. Tryptophan
b. Proline d. Glycine

d. Glycine

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The heat of combustion of methane, the major component of natural gas,
is 213 kcal/mol. The heat of combustion of propane, the major
component
of LPG or bottled gas, is 530 kcal/mol. On a kcal/mol basis, which of
these two fuels is the better source of heat energy? On a kcal/g
basis, which of these two fuels is the better source of heat energy?
a. propane, propane c. propane, methane
b. methane, propane d. methane, methane

c. propane, methane

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If 3.3 g of a gas at 40°C and 1.15 atm pressure occupies a volume of
1.0 L, what is the mass of one mole of the gas?
a. 74 c. 89
b. 65 d. 52

a. 74

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Calculate the entropy change if 350 g of water at 50C is mixed with 500
g of water at 700C.
a. 3.33 eu c. 5.05 eu
b. 6.67 eu d. 4.49 eu

d. 4.49 eu

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How to differentiate alkane alkene and alkyne?
a. combustion on an empty beaker
b. nature of carbon and its branching
c. reaction with Br2
d. all of these

c. reaction with Br2

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Process of breaking down a large isotope into smaller isotopes.
a. nuclear fission c. nuclear fusion
b. beta particle emission d. gamma ray emission

a. nuclear fission

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Can a hydrogen bond form between
(1) Two molecules of methanol, CH3OH?
(2) Two molecules of formaldehyde, CH2O?
(3) One molecule of methanol, CH3OH, and one of formaldehyde,
CH2O?
a. yes, yes, yes c. no, yes, no
b. yes, no, yes d. yes, no, no

b. yes, no, yes

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What will happen to ice at 0°C if the pressure decreases from 1 atm to
0.001 atm?
a. it becomes vapor c. it becomes liquid
b. it remains solid d. both a and c are possible

a. it becomes vapor

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How does alpha, beta and gamma particle affect the mass number of an atom? a. 4, 1, 0 c. 4, 0, 0 b. 4,-1, 0 d. 2,-1, 0

c. 4, 0, 0

Notation on alkane containing Cl a. chloro c. chlorate b. chloride d. chloric

a. chloro

In an autoclave, a constant amount of steam is generated at a constant volume. Under 1.00 atm pressure, the steam temperature is 100°C. What pressure setting should be used to obtain a 165°C steam temperature for the sterilization of surgical instruments? a. 2.3 atm c. 1.8 atm b. 1.2 atm d. 2.6 atm

c. 1.8 atm

What was Melvin Calvin was known for his study of? a. x-rays c. magnetics b. photosynthesis d. boiling point

b. photosynthesis

. Using the equilibrium constants given for reactions (1) and (2), what is the equilibrium constant for reaction (3)? (1) 2NO(g) + O2(g) → N2O4(g) Kp = 1.49 × 1013 (2) 2NO(g) + O2(g)→ 2NO2(g) Kp = 1.66 × 1012 (3) N2O4(g) → 2NO2(g) a. 0.0123 c. 0.111 b. 8.98 d. 80.3

c. 0.111

. Which of the following is the best definition of the chemical nature of soap? a. A soap is a very long molecule. b. A soap is a long chain carboxylic acid. c. A soap is an ester of glycerol and a long chain carboxylic acid. d. A soap is a salt of a long chain carboxylic acid.

d. A soap is a salt of a long chain carboxylic acid.

. Iodine vapor forms iodine crystals when it touches a cold surface. What is the reverse of the process being described? a. deposition c. fusion b. condensation d. sublimation

d. sublimation

Balancing C2H5SH + O2 → CO2 + H20 + SO a. 1, 8, 4, 5, 1 c. 2, 7, 4, 4, 2 b. 2, 9, 4, 6, 2 d. 1, 5, 4,3, 1

b. 2, 9, 4, 6, 2

3. Given: Dodecane (1) Is it soluble in water? (2) Is it soluble in hexane? (3) Is it combustible? (4) Is it solid, liquid or gas at room temperature and atmospheric conditions? (5) Is it denser than water? a. no, yes, yes, liquid, less dense b. no, yes, yes, gas, denser c. no, yes, no, liquid, less dense d. no, no, yes, gas, dense

a. no, yes, yes, liquid, less dense

Which of the following has a larger ionic nucleus? Na+ or Na? a. Both c. Na+ b. Na d. none of these

b. Na

The purpose of control rods in a fission reactor is to: a. cool down the reactor fuel. b. prevent oxygen from reaching the fuel. c. absorb neutrons generated in the fission process. d. absorb electrons emitted in the fission process.

c. absorb neutrons generated in the fission process.

. What compound is a ketone but it is not a carbohydrate but is useful commercially? a. ethyl alcohol c. glucose b. aldehyde d. acetone

d. acetone

Which bond is the least polar? C-C, C-N, C-Cl, C-F, C-O? a. C-C < C-Cl < C-N < C-O < C-F c. C-F < C-N < C-C < C-Cl < C-O b. C-Cl < C-N < C-C < C-F < C-O d. C-O < C-N < C-F < C-C < C-Cl

a. C-C < C-Cl < C-N < C-O < C-F

. Which Republic Act is the PRC Modernization Act of 2000? a. R.A. 8750 c. R.A. 8890 b. R.A. 7897 d. R.A. 8981

d. R.A. 8981

. You are presented with a Lewis dot structure of element X as X. To which two groups in the Periodic Table might this element belong? a. Group 2 A c. Group 1 A b. Group 7 A d. Group 4 A

a. Group 2 A

0. The molar volume of benzene(l) is 88.9 cc at 20°C and 1 atm pressure. Find the value of ΔG for the compression of 1 mole of the liquid from 1 to 100 atm. a. 254 calories c. 222 calories b. 287 calories d. 213 calories

d. 213 calories

A radioactive isotope with an intensity (activity) of 100 mCi per vial is delivered to a hospital. The vial contains 10 mL of liquid. The instruction is to administer 2.5 mCi intravenously. How many milliliters of the liquid should be administered? a. 0.66 ml c. 0.40 ml b. 0.18 ml d. 0.25 m

d. 0.25 m

Diving, particularly SCUBA (Self-Contained Underwater Breathing Apparatus) diving, subjects the body to increased pressure. Each 10 m (approximately 33 ft) of water exerts an additional pressure of 1 atm on the body. What is the partial pressure of oxygen in the air in the lungs at a depth of 100 ft? a. 0.83 atm c. 3.1 atm b. 4.0 atm d. 0.77 atm

a. 0.83 atm

The solubility of aspartic acid in water is 0.500 g in 100 mL at 25°C. If we dissolve 0.251 g of aspartic acid in 50.0 mL of water at 50°C and let the solution cool to 25°C without stirring, shaking, or otherwise disturbing the solution, would the resulting solution be a saturated, unsaturated, or supersaturated solution? a. saturated c. supersaturated b. unsaturated d. cannot be determined

c. supersaturated

A certain liquid has a viscosity of 0.0001 poise and a density of 3.2 g/ml. How long will it take for platinum ball with 2.5 mm radius to fall 1 cm through the liquid? The density of the platinum is 21.4 g/ml. a. 33.4 s c. 28.4 s b. 40.5 s d. 48.9 s

b. 40.5 s

The heat of vaporization of liquid Freon-12, CCl2F2, is 4.71 kcal/mol. Calculate the energy required to vaporize 39.2 g of this compound. The molecular weight of Freon-12 is 120.9 amu. a. 1.53 kcal c. 1.98 kcal b. 1.12 kcal d. 1.67 kcal

a. 1.53 kcal

Microwaves are a form of electromagnetic radiation that is used for the rapid heating of foods. What is the frequency of a microwave with a wavelength of 5.8 cm? a. 3.6x109 /s c. 5.2x109 /s b. 9.4x109 /s d. 1.7x109 /s

c. 5.2x109 /s

Water on heating from 1 to 4°C a. contracts c. expands b. has same volume d. may contract or expand

a. contracts

This law explains why aerosol cans carry the warning “Do not incinerate”. a. Charles Law c. Boyles Law b. Gay-Lussac Law d. Daltons Law of Partial Pressure

b. Gay-Lussac Law

. A teardrop with a volume of 0.5 mL contains 5.0 mg salt. What is the molarity of the salt in the teardrop? a. 0.4 M c. 0.1 M b. 0.3 M d. 0.2 M

d. 0.2 M

How much work is done when a man weighing 75 kg climbs the Washington monument, 555 ft high? How many kilocalories must be supplied to do this muscular work, assuming that 25% of the energy produced by the oxidation of food in the body can be converted into muscular work? a. 254 kcal c. 119 kcal b. 380 kcal d. 476 kcal

c. 119 kcal

The normal boiling point of a substance depends on both the mass of the molecule and the attractive forces between molecules. Arrange the compounds in each set in order of increasing boiling point: (1) HCl, (2) HBr and (3) HI. a. HI < HBr < HCl c. HCl < HBr < HI b. HCl < HI < HBr d. HI < HCl < HBr

c. HCl < HBr < HI

Trichlorofluoromethane (Freon-11, CCl3F) as a spray is used to temporarily numb the skin around minor scrapes and bruises. It accomplishes this by reducing the temperature of the treated area, thereby numbing the nerve endings that perceive pain. Calculate the heat in kilocalories that can be removed from the skin by 1.00 mL of Freon-11. The density of Freon-11 is 1.49 g/mL, and its heat of vaporization is 6.42 kcal/mol. a. 7x10-2 kcal c. 5x10-2 kcal b. 1x10-2 kcal d. 3x10-2 kcal

a. 7x10-2 kcal

. Which isotope of boron is the most stable: boron-8, boron-10, or boron-12? a. boron-8 c. boron-12 b. boron-10 d. both a and b

b. boron-10

Balloons now are used to move huge trees from their cutting place on mountain slopes to conventional transportation. Calculate the volume of a balloon needed if it is desired to have a lifting force of 1000 kg when the temperature is 290 K at 0.940 atm. The balloon is to be filled with helium. Assume that air is 80 mol % N2 and 20 mol % O2. Ignore the mass of the superstructure and propulsion engines of the balloon. a. 1020 m3 c. 1530 m3 b. 1480 m3 d. 1660 m

a. 1020 m3

Suppose that on another planet where the atmosphere is ammonia that the pressure on the surface, at h = 0, is 400 Torr at 250 K. Calculate the pressure of ammonia at a height of 8000 m. The planet has the same g value as the earth. a. 100 Torr c. 210 Torr b. 130 Torr d. 220 Torr

c. 210 Torr

. According to the label on a piece of cheese, one serving of 28 g provides the following daily values: 2% of Fe, 6% of Ca, and 6% of vitamin A. The recommended daily allowances (RDA) of each of these nutrients are as follows: 15 mg Fe, 1200 mg Ca, and 0.800 mg vitamin. Calculate the concentrations of each of these nutrients in the cheese in ppm. a. 5 ppm c. 15 ppm b. 10 ppm d. 20 ppm

d. 20 ppm

What is the specific gas constant of dry air in J/kg per unit Kelvin? a. 0.287 c. 2.87 b. 28.7 d. 287

d. 287

Write an equation for the reaction of HCl with each compound. Which are acid–base reactions? Which are redox reactions? (1) Na2CO3 (5) Fe2O3 (2) Mg (6) CH3NH2 (3) NaOH (7) NaHCO3 (4) NH3 a. none c. only (2) b. (1), (2) and (7) d. only (6)

c. only (2)

9. An ice cube at 0 °C weighing 100.0 g is dropped into 1 kg of water at 20 °C. Does all of the ice melt? If not, how much of it remains? The latent heat of fusion of ice at 0 °C is 6.025 kJ/mol, and the molar heat capacity of water, CP is 75.3 J/mol-K. a. 100 g c. 58 g b. 75 g d. 12 g

a. 100 g

. Perform the same calculations with 10 ice cubes of the same size dropped into the water. a. 1000 g c. 580 g b. 750 g d. 120 g

b. 750 g

A solution of calcium chloride is prepared in a 1.00-L volumetric flask. A 60.00-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 solution to 1.00 L. What is the concentration of calcium chloride in units of molarity? a. 0.29 M c. 0.38 M b. 0.61 M d. 0.54 M

d. 0.54 M

. Classify the following systems as homogeneous, heterogeneous, or colloidal mixtures. (1) Physiological saline solution (2) Orange juice (3) A cloud (4) Wet sand (5) Suds (6) Milk a. homogeneous, homogeneous, homogeneous, heterogeneous, colloidal, homogeneous b. homogeneous, heterogeneous, colloidal, heterogeneous, heterogeneous, colloidal c. homogeneous, heterogeneous, colloidal, heterogeneous, colloidal, colloidal d. homogeneous, homogeneous, homogeneous, heterogeneous, colloidal, colloida

c. homogeneous, heterogeneous, colloidal, heterogeneous, colloidal, colloidal

Calculate the degree of dissociation for a 0.010-m solution of HCl that freezes at 273.114 K. a. 0.96 c. 0.88 b. 0.94 d. 0.80

b. 0.94

the activation energy of the reverse reaction also 10.0 kcal/mol, or would it be more or less? a. less c. more b. the same d. cannot be determined

b. the same

Assume that the following exothermic reaction is at equilibrium: H2(g) = I2(g) +2HI(g) Tell whether the position of equilibrium will shift to the right or the left if we (1) Remove some HI (2) Add some I2 (3) Remove some I2 (4) Increase the temperature (5) Add a catalyst a. right, right, left, left, no shift b. right, left, left, right, no shift c. left, left, right, right, no shift d. right, right, left, right, righ

a. right, right, left, left, no shift

. Balance the chemical equation given K4Fe(CN)6 + H2SO4 + H2O = K2SO4 + FeSO4 + (NH4)2SO4 + CO a. 1,6,6,2,1,3,6 c. 6,3,1,2,6,6,1 b. 2,6,6,2,1,3,6 d. 1,6,6,2,1,2,6

a. 1,6,6,2,1,3,6

Calculate the mole fraction solubility of naphthalene at 25 °C in a liquid with which it forms an ideal solution. The ΔfusH = 19.0 kJ/mol for naphthalene at 25 °C. Its normal melting point is 80.2 °C. a. 0.228 c. 0.415 b. 0.302 d. 0.567

b. 0.302

Suppose you have an aqueous solution prepared by dissolving 0.050 mol of NaH2PO4 in 1 L of water. This solution is not a buffer, but suppose you want to make it into one. How many moles of solid NaH2PO4 must you add to this aqueous solution to make it into a buffer of pH 7.21. a. 0.05 mol c. 0.0005 mol b. 0.5 mol d. 0.005 mol

a. 0.05 mol

___ is a rather disagreeable-smelling liquid used as a preservative for laboratory specimens. a. Acetaldehyde c. Methanal b. Methanol d. Valeraldehyde

c. Methanal

Reactions proceeds spontaneously at low temperatures. At high temperatures, the reverse reaction becomes spontaneous. a. + Δ H and + ΔS c. - Δ H and + ΔS b. - Δ H and – ΔS d. + Δ H and – ΔS

b. - Δ H and – ΔS

What is the common name of this compound – C6H5OCH3? a. Aniline c. Cumene b. Styrene d. Anisole

d. Anisole

The influence of mixing of s and p orbitals; the greater the fraction of s character of the hybrid orbital, the more electronegative is the atom a. Hybridization c. Hybridization Effect b. Hybrid Orbitals d. Hybrid

c. Hybridization Effect

Name the Alkane a. 2-ethyl-3,4-dimethylpentane b. 3,4,5-trimethylhexane c. 4-ethyl-2,3-dimethylpentane d. 2,3,4-trimethylhexane

d. 2,3,4-trimethylhexane

. For each of the following, identify the radiation emitted. (1) Beryllium-10 changes to boron-10 CH CH3 H3C CH CH3 CH H2C CH3 CH3 (2) Europium-151m changes to europium-151 (3) Thallium-195 changes to mercury-195 (4) Plutonium-239 changes to uranium-235 a. alpha, gamma, positron, beta c. beta, gamma, alpha, positron b. alpha, gamma, beta, positron d. beta, gamma, positron, alpha

d. beta, gamma, positron, alpha

Electrolysis of molten KBr generates bromine gas, which can be used in industrial bromination processes. How long will it take to convert a 500.00-kg batch of phenol (C6H5OH) to monobromophenol using a current of 20 000 A? a. 10.1 hr c. 14.2 hr b. 12.8 hr d. 15.6 hr

c. 14.2 hr

A 5.00 mL aliquot of bleach (density = 1.61 g/mL) was diluted and treated with excess KI to convert hypochlorite to chloride. The liberated I2 required 22.85 mL of 0.214 M Na2S2O3 for titration. Calculate the % ClO–in the bleach. a.4.18% c. 2.72% b.1.56% d. 3.12%

b.1.56%

Balance the chemical equation K4Fe(CN)6 + KMnO4 + H2SO4 = KHSO4 + Fe2(SO4)3 + MnSO4 + HNO3 + CO2 + H2O a.60,60,188,10,122,299,162,5,122 b.122,299,162,5,122,60,60,188,10 c.188,60,60,122,5,162,299,122,10 d.10,122,299,162,5,122,60,60,188

d.10,122,299,162,5,122,60,60,188

A base mixture sample weighing 976 mg was dissolved in sufficient water to make 100 mL solution and divided into two equal portions. The first portion was titrated with 52.05 mL of 0.1004M HCl to the methyl red end point. The other portion was titrated with 23.02 mL of the acid to the phenolphthalein endpoint. Calculate the % composition of sample. a. 50.16% NaHCO3, 50.20% Na2CO3 c. 10.38% NaHCO3, 50.20% Na2CO3 b. 23.90% NaHCO3, 50.20% Na2CO3 d. 18.94% NaHCO3, 62.70% Na2CO3

c. 10.38% NaHCO3, 50.20% Na2CO3

What is the major product of the reaction? ⃗1. HNO3 2. H2 SO4 ⃗1.Fe 2. HCl ⃗1.HNO2 2.lowtemp. 1.Cu2 (CN )2 2.heat a. Aniline c. Benzene b. Benzonitrile d. Iodobenzene

b. Benzonitrile

An environmental engineering student was very interested in the reaction of the chemical 2,4,6-chickenwire. She went into the lab and found that 2,4,6-chickenwire degrades in water. During her experiments she collected the data in the following table. Determine if the reaction is zero-, first-, second-, third-order with respect to the concentration of 2,4,6-chickenwire. Time, min Concentration, mg/L Time, min Concentration, mg/L 0 10.0 10 5.46 1 8.56 20 4.23 2 8.14 40 1.26 4 6.96 880 0.218 8 6.77 a. zero c. second b. first d. third

b. first

The phosphate in a 3000 mg sample of industrial detergent was precipitated by the addition of 1-gram AgNO3. The solution was filtered and the filtrate required 18.23 mL of 0.1377 M KSCN. Calculate the percentage of phosphate in the detergent. AgNO3 (169.87 g/mol) PO4–3 (94.97 g/mol) a. 3.56% c. 7.12% b. 5.35% d. 10.69%

a. 3.56%

. The difference between the actual property value of a solution and the value it would have as an ideal solution at the same T and P and composition is called a. Residual c. Excess b. Partial property d. Gibbs free energy

c. Excess

The Waramurungundi tannery with a wastewater flow of 0.011 m3/s and a BOD5 of 590 mg/L discharges into the Djanggawul Creek. The creek has a 10-year, 7-day low flow of 1.7 m3/s. Upstream of the Waramurungundi tannery, the BOD5 of the creek is 0.6 mg/L. The BOD rate constants (k) are 0.115 day−1 for the Waramurungundi tannery and 3.7 day−1 for the creek. Calculate the initial ultimate BOD after mixing. a. 9.27 mg/L c. 6.05 mg/L b. 8.41 mg/L d. 3.16 mg/L

a. 9.27 mg/L

. The Bailey Stone Works employs six people. Assuming that the density of uncompacted waste is 480 kg · m−3, determine the annual volume of solid waste produced by the stone works assuming a waste generation rate of 1 kg · capita−1 · day. a. 3.8 m3/yr c. 4.6 m3/yr b. 1.9 m3/yr d. 2.2 m3/yr

c. 4.6 m3/yr

Calculate the weight of primary standard Na2C2O4 (134 g/mol) necessary to react with 25 mL of 0.2005 M KMnO4 in acidic medium. a. 0.671 gram c. 1.343 grams b. 1.679 grams d. 2.687 grams

b. 1.679 grams

. Hypochlorous acid decays in the presence of ultraviolet radiation. Assume that degradation occurs according to first-order kinetics and the rate of degradation was measured to be 0.12 day−1 (at a particular sunlight intensity and temperature). Given this, how long does it take for the concentration of hypochlorous acid to reach nondetectable levels (0.05 mg/L) if the initial concentration were 3.65 mg/L? a. 25 days c. 36 days b. 14 days d. 47 day

c. 36 days

The company you work for plans to release a waste stream containing 7.0 mg/L of benzaldehyde. calculate the theoretical carbonaceous oxygen demand of this waste stream (in mg/L). a. 17 mg/L c. 19 mg/L b. 11 mg/L d. 14 mg/L

a. 17 mg/L

. A 0.0722 M acid has pH of 3.11, what is the Ka of the acid? a. 4.2 x 10-6 c. 8.35 x 10-6 b. 8.35 x 10-7 d. 4.2 x 10-7

c. 8.35 x 10-6

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. a. 3 years c. 5 years b. 6 years d. 4 years

a. 3 years

Assume the density of the compacted waste to be 490 kg · m−3. What is the ratio of HPO4 2- /H2PO4 - in a phosphate buffer of pH 7.9 (the pH of human pancreatic fluid)? a. 3:1 c. 1:1 b. 4:1 d. 5:1

d. 5:1

The discharge from the Renenutet sugar beet plant causes the DO at the critical point to fall to 4.0 mg/L. The Meskhenet Stream has a negligible BOD and the initial deficit after the river and wastewater have mixed is zero. What DO will result if the concentration of the waste (Lw) is reduced by 50%? Assume that the flows remain the same and that the saturation value of DO is 10.83 mg/L in both cases. a. 6.1 mg/L c. 8.9 mg/L b. 7.4 mg/L d. 9.3 mg/L

b. 7.4 mg/L

Following are pH ranges for several human biological materials. From the pH at the midpoint of each range, calculate the corresponding [H3O -]. Which materials are acidic? (1) Milk, pH 6.6–7.6 (2) Gastric contents, pH 1.0–3.0 (3) Spinal fluid, pH 7.3–7.5 (4) Saliva, pH 6.5–7.5 (5) Urine, pH 4.8–8.4 (6) Blood plasma, pH 7.35–7.45 (7) Feces, pH 4.6–8.4 (8) Bile, pH 6.8–7.0 a. 1, 4, 7, 8 c. 2, 5, 7, 8 b. 2, 5, 6, 7 d. 1, 3, 7, 8

c. 2, 5, 7, 8

A water contains 100.0 mg/L CO2 −3 and 75.0 mg/L HCO−3 at a pH of 10 (T = 25◦C). Calculate the exact alkalinity. Approximate the alkalinity by ignoring the appropriate chemical species. a. 167 mg/L c. 459 mg/L b. 233 mg/L d. 385 mg/L

b. 233 mg/L

A landfill that is 12 ha in area has a liner of thickness 0.9 m. Each year 1700 m3 of leachate is collected. The hydraulic conductivity of the liner is 3.9 × 10−10 m · s−1. What is the head of water above the liner? a. 2 m c. 1 m b. 3 m d. 4 m

c. 1 m

5. What concentration of Al2(SO4)3 has the same ionic strength as 0.1 M NaCl? a. 1.7x10-2 M c. 2.5x10-2 M b. 3.3x10-2 M d. 6.7x10-2 M

d. 6.7x10-2 M

Calculate the NBOD of glutamic acid. Assume the concentration of glutamic acid is 0.1 mM. a. 5.8 mg/L c. 8.1 mg/L b. 6.4 mg/L d. 2.3 mg/L

b. 6.4 mg/L

Above the stratosphere, the concentration of ozone and other gases is low, and the temperature decreases with increasing altitude a. troposphere c. mesosphere b. stratosphere d. ionosphere

c. mesosphere

How many grams of urea must be added to 4000 grams of water to make the solution boil at 100.320C? a. 75.3 grams c. 150.5 grams b. 185.4 grams d. 205.6 grams

c. 150.5 grams

What is the solubility of CaF2 in water in mols of CaF2 per L of solution? Ksp for CaF2 is 1.7 × 1010. a. 9.2×10—6 M c. 1.3×10—5 M b. 3.5×10—4 M d. 5.5×10—4 M

b. 3.5×10—4 M

You work in a lab and it is known that radioactivity is being emitted with an intensity of 175 mCi at a distance of 1.0 m from the source. How far, in meters, from the source should you stand if you wish to be subjected to no more than 0.20 mCi? a. 30 m c. 40 m b. 10 m d. 20 m

a. 30 m

Day 1: Physical and Chemical Principles Auxesis Review Center Flashcards

(100 cards)