DAY 1 PRETEST Flashcards by John Clavines Edradan

If aspirin is made using the raw materials salicylic acid and acetic anhydride with a yield of 75%, how many grams of aspirin will be produced?

a. 1
b. 30
c. 15
d. 25

d. 25

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Classify each of the following as homogeneous or heterogeneous:

I. a door

II. the air you breathe

III. a cup of coffee (black)

IV. the water you drink

V. salsa

VI. your lab partner

a. homo, homo, hetero, hetero, homo, hetero

b. hetero, homo, homo, homo, hetero, hetero

c. homo, homo, homo, homo, hetero, homo

d. hetero, hetero, homo, homo, homo, hetero

b. hetero, homo, homo, homo, hetero, hetero

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How many beta particles are emitted in the decomposition of 238 92U to 206 82Pb?

a. 8
b. 2
c. 6
d. 4

c. 6

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Give the mass empirical formula of the following compound if a sample contains 57.8%C, 36%H, and 38.6%O by mass.

a. C8H6O4

b. C12H9O6

c. C4H3O2

d. C2HO

c. C4H3O2

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The decomposition of iodoethane in the gas phase proceeds according to the following reactions:

C2H5I (g) –> C2H4 (g) + HI (g)

At 660 K, k = 7.2x10-4 /s and at 720 K, k = 1.70x10-2/s. If the initial pressure of iodoethane is 894 torr at 2450C, what is the pressure of iodoethane after three half-lives?

a. 356 torr

b. 112 torr

c. 508 torr

d. 429 torr

b. 112 torr

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Where in the body does fatty acid synthesis occur?
Group of answer choices

a. Golgi apparatus

b. Cytoplasm

c. Ribosomes

d. Mitochondrion

b. Cytoplasm

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A solution of an unknown base was titrated with 0.150 M HCl, and 22.0 mL of acid was needed to reach the end point of the titration. How many moles of the unknown base were in the solution?
Group of answer choices

a. 1.2x10^-3 ml

b. 2.2x10^-3 ml

c. 3.3x10^-3 ml

d. 0.9x10^-3 ml

c. 3.3x10^-3 ml

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Suppose you have a phosphate buffer of pH 7.21. If you add more solid NaH2PO4 to this buffer, would you expect the pH of the buffer to increase, decrease, or remain unchanged?
Group of answer choices

a. increase

b. either increase or decrease

c. remain the same

d. decrease

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A water sample contains 60 mg/L of calcium, 60 mg/L of magnesium and 25 mg/L of sodium. What is the total hardness in mg/L as CaCO3?

a. 7.9

b. 85

c. 145

d. 395

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What is the theoretical oxygen demand in liters of air for 300 mg/L solution of methylamine, CH3NH2, to decompose completely?
Group of answer choices

a. 2.9 L

b. 3.6 L

c. 4.2 L

d. 5.8 L

c. 4.2 L

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Calculate the degree of deprotonation of the side chain of cysteine at pH 7.30, given that the side chain –SH group has pKa = 8.20.
Group of answer choices

a. 0.86

b. 0.14

c. 0.27

d. 0.73

a. 0.86

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A stream flowing with a velocity of 2 mph contains no BOD, but has an oxygen deficit of 6 mg/L. Ten miles downstream this deficit has been reduced to 4 mg/L through adsorption from the atmosphere. The stream conditions are uniform throughout its length. Assuming the rate of aeration is proportional to the deficit, what would be the deficit 35 miles downstream from the original point?
Group of answer choices

a. 1.46 mg/L

b. 3.22 mg/L

c. 4.14 mg/L

d. 2.11 mg/L

a. 1.46 mg/L

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What structural characteristics do citric acid and malic acid have in common?
Group of answer choices

a. Both has three moieties of carboxylic acid

b. They are both hydroxy acids

c. They are heterocyclic compounds

d. They contain an alkene bridge

b. They are both hydroxy acids

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If each mole of ATP yields 7.3 kcal of energy upon hydrolysis, how many kilocalories of energy would you get from 1 g of CH3COO- entering the citric acid cycle?
Group of answer choices

a. 2.2 kcal

b. 3.9 kcal

c. 1.5 kcal

d. 0.7 kcal

c. 1.5 kcal

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What is the difference between a coenzyme and a cofactor?
Group of answer choices

a. Coenzyme activator is inorganic while cofactor is organic

b. Cofactor is more generic; it means a nonprotein part of an enzyme. A coenzyme is an organic factor.

c. Coenzyme needs allosteric activator while cofactor requires conformational induction

d. Cofactor contains heme groups, coenzyme has disulfide bridge

b. Cofactor is more generic; it means a nonprotein part of an enzyme. A coenzyme is an organic factor.

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Who discovered phenolphthalein?
Group of answer choices

a. Louis-Jacques Thenard

b. Adolf von Baeyer

c. Albert Hofmann

d. Joseph Louis Gay-Lussac

b. Adolf von Baeyer

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How many high-energy phosphate bonds are in the ATP molecule?
Group of answer choices

a. 0

b. 2

c. 1

d. 3

b. 2

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Classify each of the following as an element, a compound, or a mixture.

a) diamond

b) sea water

c) gasoline

d) wine

e) a pebble

f) bronze

Group of answer choices

a. element, compound, compound, element, compound, compound

b. compound, mixture, compound, mixture, mixture, element

c. element, mixture, mixture, mixture, mixture, mixture

d. compound, compound, mixture, compound, compound, mixture

c. element, mixture, mixture, mixture, mixture, mixture

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Which has higher absolute entropy at a temperature of 250C, cyclopropane or propylene? Why?
Group of answer choices

a. Both have the same absolute entropy at normal temperature.

b. Propylene due to the free rotation around the carbon-carbon single bond.

c. None of these

d. Cyclopropane due to the free rotation around the carbon-carbon double bond.

b. Propylene due to the free rotation around the carbon-carbon single bond.

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Applying the Octet Rule, determine how many electrons each must each atom gain or loss to acquire an electron configuration identical to the noble gas nearest to it in atomic number; Sr, S and Si.
Group of answer choices

a. none of these

b. krypton; argon, argon and krypton

c. neon; argon and krypton; krypton

d. argon; krypton, krypton and argon

b. krypton; argon, argon and krypton

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When 1.61 x 10-3 moles of phenolphthalein indicators in dissolved in one liter of water plus ethanol. Estimate the the concentration at equilibrium of [Hphth], [H3O+] and [phth-].
Group of answer choices

a. None of these

b. [Hpth] = 0.913 x 10-5 M; [H30+] = 6.99 x 10-8 M; [phth-1] = 6.72 x 10-6 M

c. [Hpth] = 1.599 x 10-3 M; [H30+] = 8.0 x 10-7 M; [phth-1] = 8.0 x 10-7 M

d. [Hpth] = 1.512 x 10-4 M; [H30+] = 7.82 x 10-6 M; [phth-1] = 6.07 x 10-6 M

c. [Hpth] = 1.599 x 10-3 M; [H30+] = 8.0 x 10-7 M; [phth-1] = 8.0 x 10-7 M

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A large stream has a reoxygenation constant of 0.4 day−1 and a velocity of 0.85 m/s. At the point at which an organic pollutant is discharged, it is saturated with oxygen at 10 mg/L (DO = 0). Below the outfall the ultimate demand for oxygen is found to be 20 mg/L, and the deoxygenation constant is 0.2 day−1. What is the dissolved oxygen 48.3 km downstream?
Group of answer choices

a. 6.5 mg/L

b. 5.0 mg/L

c. 7.8 mg/L

d. 2.2 mg/L

c. 7.8 mg/L

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Glucose is the only carbohydrate compound that the brain can use for energy. Which pathway is mobilized to supply the need of the brain during starvation?
Group of answer choices

a. none of these

b. gluconeogenesis

c. glycogenesis

d. glycolysis

b. gluconeogenesis

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Predict whether each of the following nuclides is stable or unstable (radioactive). If the nuclide is unstable, predict the type of radioactivity you would expect it to 45K, 56Fe, 11Na, 194Tl.
Group of answer choices

a. stable, stable, stable, stable

b. stable, unstable-alpha production, unstable-electron capture, unstable-alpha production

c. unstable-alpha production, unstable-positron production, stable, unstable-electron capture

d. unstable-beta production, stable, unstable-positron production, unstable-alpha production

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Mercury poisoning is a debilitating disease that is often In the human body, mercury reacts with essential enzymes leading to irreversible inactivity of these enzymes. If the amount of mercury in a polluted lake is 0.4 microgram Hg/mL, what is the total mass in kilograms of mercury in the lake? (The lake has a surface area of 100 mi2 and an average depth of 20 ft.) Group of answer choices a. 55.7x10^5 b. 64.5x10^5 c. 27.1x10^4 d. 80.3x10^4

a. 55.7x10^5

Crystals of a material are suspended in the middle of a cup of water at 2 deg C. How might you enable the crystals to rise to the surface of the water so that you can harvest them? Group of answer choices a. Decrease the temperature of water to 0 deg C b. Add more crystals c. Add more water d. Increase the temperature of water to 4 deg C

d. Increase the temperature of water to 4 deg C

What is the organic formula of lindane, chlorinated pesticide which has been banned? It is composed of 24.781% carbon, 2.082% hydrogen, 73.142% chlorine and has a molecular mass of 290.834. Group of answer choices a. C3H6Cl6 b. C6H12Cl6 c. C3H6Cl12 d. (CHCl)6

d. (CHCl)6

Consider the system A (g) = B (g) at 250C. Assuming GA0 = 8996 J/mol and GB0 = 11718 J/mol, calculate the value of equilibrium constant for this reaction. Group of answer choices a. 2.56 b. 0.33 c. 0.50 d. 1.98

b. 0.33

Predict the order of the melting points of triglycerides containing fatty acids, as follows: I. Palmitic, palmitic, stearic II. Oleic, stearic, palmitic III. Oleic, linoleic, oleic Group of answer choices a. I < III < II b. II < I < III c. II < III < I d. III < II < I

d. III < II < I

A reported synthesis of the transuranium element bohrium (Bh) involved the bombardment of berkelium-249 with neon-22 to produce bohrium-267. The half-life of bohrium-267 is 15.0 seconds. If 199 atoms of bohrium-267 could be synthesized, how much time would elapse before only 11 atoms of bohrium-267 remain? Group of answer choices a. 50 s b. 79 s c. 44 s d. 63 s

d. 63 s

How many molecules are in one drop of water? Group of answer choices a. 1.7x10^24 b. 1.7x10^21 c. 1.0x10^21 d. 1.0x10^24

b. 1.7x10^21

Which of the following objects are chiral (assume that there is no label or other identifying mark)? a) Pair of scissors b) Tennis ball c) Paper clip d) Beaker e) The swirl created in water as it drains out of a sink or bathtub a. achiral, chiral, chiral, achiral, chiral b. chiral, chiral, chiral, chiral, chiral c. chiral, achiral, achiral, achiral, chiral d. chiral, achiral, chiral, chiral, achiral

c. chiral, achiral, achiral, achiral, chiral

Consider the reaction 2O(g) --> O2 (g). Predict the signs of deltaH and Would the reaction more spontaneous at high or low temperatures? Group of answer choices a. deltaH = -, delta S = -, low b. deltaH = +, deltaS = -, low c. deltaH = +, deltaS = +, high d. deltaH = -, deltaS = +, high

a. deltaH = -, delta S = -, low

A sample of municipal sewage is diluted to 1% by volume prior to running a BOD5 After 5 days the oxygen consumption is determined to be 2.00 mg · L−1. What is the BOD5 of the sewage? Group of answer choices a. 300 mg/L b. 200 mg/L c. 250 mg/L d. 150 mg/L

b. 200 mg/L

In each case, tell whether the bond is ionic, polar covalent, or nonpolar covalent: Br2, BrCl, HCl, SrF2, SiH4, CO, N2, CsCl Group of answer choices a. polar covalent, ionic, polar covalent, nonpolar covalent, nonpolar covalent, nonpolar covalent, polar covalent, polar covalent b. nonpolar covalent, nonpolar covalent, polar covalent, ionic, nonpolar covalent, polar covalent, nonpolar covalent, ionic c. nonpolar covalent, nonpolar covalent, ionic, nonpolar covalent, polar covalent, nonpolar covalent, ionic d. nonpolar covalent, polar covalent, nonpolar covalent, nonpolar covalent, polar covalent, polar covalent, ionic, polar covalent

b. nonpolar covalent, nonpolar covalent, polar covalent, ionic, nonpolar covalent, polar covalent, nonpolar covalent, ionic

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

c. reaction with Br2

Carbon tetrachloride, CCl4, has a vapor pressure of 213 torr at 400C and 836 torr at 800 What is the normal boiling point of CCl4? Group of answer choices a. 60degC b. 58degC c. 77degC d. 49degC

c. 77degC

The initial ultimate BOD after mixing of the Bergelmir River is 0 mg- L−1. The DO in the Bergelmir River after the wastewater and river have mixed is at saturation. The river temperature is 10◦C. At 10◦C, the deoxygenation rate constant (kd) is 0.30 day−1, and the reaeration rate constant (kr) is 0.40 day−1. Determine the critical DO. Group of answer choices a. 5.4 mg/L b. 6.8 mg/L c. 7.5 mg/L d. 4.1 mg/L

c. 7.5 mg/L

How many carbon atoms in olvanil? Group of answer choices a. 15 b. 38 c. 40 d. 26

c. 40

These compounds are formed by the reaction of acids with alcohol. Group of answer choices a. Bases b. Enzymes c. Esters d. Ethers

c. Esters

The Tanay Rizal Stone Works employs six workers who produce uncompacted waste from the products formed for building decors. If the density of the uncompacted waste is 40 kilograms per cubic meters, determine the annual volume of solid waste produced by the factory assuming a waste generation volume rate of one kilogram per capita per day. Group of answer choices a. 8.01 cubic meters b. 3.22 cubic meters c. 4.65 cubic meters d. 5.56 cubic meters

c. 4.65 cubic meters

Choose the process that occurs with a decrease in entropy Group of answer choices a. sublimation of dry ice b. boiling of water c. dissolving salt in water d. freezing of water

d. freezing of water

Why is it accurate to assume that the carbon-14 to carbon-12 ratio in a living plant remains constant over the lifetime of the plant? I. Carbon 14 is continually generated in the upper atmosphere by the production and decay of nitrogen 14. II. Carbon 14 incorporated into carbon dioxide and the other compounds are distributed worldwide as part of the carbon cycle. III. The continual formation of carbon-14; transfer of isotope within the oceans, atmospheres and biosphere; and the decay of living matter keep the supply constant. Group of answer choices a. F, F, T b. T, F, T c. F, F, F d. T, T, T

d. T, T, T

Consider the Earth to be a blackbody with average temperature 15degC and surface area equal to 5.1x10^14 m^2. Find the rate at which energy is radiated by the Earth and the wavelength at which maximum power is radiated. Compare this peak wavelength with that for a 5800-K blackbody (the sun). Group of answer choices a. 3x10^15 W, 13.6x10^6 m (earth, 0.20x10^6 m (sun) b. 1x10^19 W, 12.9x10^6 m (earth, 0.33x10^6 m (sun) c. 2x10^17 W, 10.1x10^6 m (earth, 0.48x10^6 m (sun) d. 4x10^16 W, 15.5x10^6 m (earth, 0.57x10^6 m (sun)

c. 2x10^17 W, 10.1x10^6 m (earth, 0.48x10^6 m (sun)

The density of acetylene gas, in a 4-L container at 0 degC and 2 atm pressure is 0.02 g/mL. What would be the density of the gas under identical temperature and pressure if the container were partitioned into two 2-L compartments? Group of answer choices a. 0.01 g/mL b. 0.03 g/mL c. 0.02 g/mL d. 0.04 g/mL

c. 0.02 g/mL

In the combustion of 25 grams of methane gas, what is the volume of oxygen required at 25 deg C and 0.21 atm? Group of answer choices a. 363 b. 521 c. 298 d. 411

a. 363

Determine which of the following will float or sink in water: balsa wood, ethylene, glycol, table salt, ethanol. Group of answer choices a. float, float, float, float b. sink, float, sink, float c. float, sink, sink, float d. sink, sink, sink, sink

c. float, sink, sink, float

Uranium-235 undergoes a series of alpha particle and beta particle productions to end up as lead-207. How many alpha particles and beta particles are produced in the complete decay series? Group of answer choices a. 7, 4 b. 6, 3 c. 5, 5 d. 8, 6

a. 7, 4

Naturally occurring uranium is composed mostly of 238U and 235U, with relative abundances of 99.28% and 0.72%, respectively. The half-life for 238U is 4.5x109 years, and the half-life for 235U is 7.1x108 Assuming that the earth was formed 4.5 billion years ago, calculate the relative abundances of the 238U and 235U isotopes when the earth was formed. Group of answer choices a. 48% and 52% b. 64% and 36% c. 82% and 18% d. 77% and 23%

d. 77% and 23%

The sun radiates 3.9x 1023 J of energy into space every second. What is the rate at which mass is lost from the sun? Group of answer choices a. 3.5x10^6 kg/s b. 2.8x10^6 kg/s c. 1.9x10^6 kg/s d. 4.3x10^6 kg/s

d. 4.3x10^6 kg/s

Chlorine gas was first prepared in 1774 by C. W. Scheele by oxidizing sodium chloride with manganese (IV) oxide. The reaction is NaCl(aq) + H2SO4(aq) + MnO2(s) --> Na2SO4(aq) + MnCl2(aq) + H2O(l) + Cl2(g) Group of answer choices a. 3, 3, 2, 1, 1, 2, 3 b. 1, 4, 2, 3, 2, 2, 1 c. 4, 2, 1, 2, 1, 1, 2 d. 2, 3, 4, 1, 1, 2, 2

c. 4, 2, 1, 2, 1, 1, 2

Boron-10, an effective absorber of neutrons, is used in control rods of uranium-235 fission reactors to absorb neutrons and thereby control the rate of reaction. Boron-10 absorbs a neutron and then emits an a particle. Write a balanced equation for this nuclear reaction and identify the nucleus formed as an intermediate between boron-10 and the final nuclear product. Group of answer choices a. Na b. Ca c. Li d. Be

c. Li

The mass of a proton is 1.67 3 10224 g. The mass of a grain of salt is 1.0 3 1022 g. How many protons would it take to have the same mass as a grain of salt? Group of answer choices a. 7x10^22 protons b. 6x10^21 protons c. 5x10^21 protons d. 1x10^21 protons

b. 6x10^21 protons

Using the data given below: Calculate the DO concentration just mixing Oz WWTP Effluent Bubbling Run Flow, m3/s 0.36 4.8 Ultimate BOD at 200C, mg/L 27 1.35 DO, mg/L 0.9 8.5 Group of answer choices a. 5 mg/L b. 7 mg/L c. 8 mg/L d. 6 mg/L

c. 8 mg/L

How many moles of beryllium would 43.1 pure aquamarine contain? Group of answer choices a. 5.38x10^3 b. 3.2x10^3 c. 4.53 d. 1.1x10^2

d. 1.1x10^2

Suppose 50.0 mg of potassium-45, a beta emitter, was isolated in pure form. After one hour, only 3.1 mg of the radioactive material was left. What is the half-life of potassium-45? Group of answer choices a. 7.5 min b. 13.6 min c. 15 min d. 10 min

c. 15 min

A magnesium hydroxide solution is prepared by adding 10.00 g of magnesium hydroxide to a volumetric flask and bringing the final volume to 1.00 L by adding water buffered at a pH of 7.0. What is the concentration of magnesium in this solution? (Assume that the temperature is 25degC and the ionic strength is negligible). Group of answer choices a. 0.17 M b. 0.19 M c. 0.22 M d. 0.26 M

a. 0.17 M

Answer the following questions Is H+ (aq) capable of oxidizing Cu(s) to Cu2+ (aq)? Is Fe3+ (aq) capable of oxidizing I- (aq)? Is H2 (g) capable of oxidizing Ag+ (aq)? Group of answer choices a. yes, no, no b. no, yes, yes c. no, no, no d. yes, yes, yes

b. no, yes, yes

Determine whether TRUE or FALSE about the constitutional isomer. A.) They have the same molecular formula B.) They have the same molecular weight C.) They have the same connectivity to their atoms D.) They have the same physical properties Group of answer choices a. F; T; T; T b. T; F; F; F c. T; T; F; F d. F; F; T; T

c. T; T; F; F

Suppose you obtain a sample of barium 122 weighing 10.0 g and it takes 10 minutes to set up an experiment. How many grams of Barium – 122 will remain at the point when you begin the experiment? Group of answer choices a. 0.31 g b. 1.5 g c. 2.1 g d. 4.0 g

d. 4.0 g

Number of double bonds in geraniol Group of answer choices a. 2 b. 3 c. 0 d. 1

a. 2

Explain the differences in structure between a saturated hydrocarbon from an unsaturated hydrocarbon. Group of answer choices a. Any of these b. A saturated hydrocarbon can no longer accept any hydrocarbon or inorganic element and compound, while an unsaturated hydrocarbon is more of flexible in reaction mechanisms. c. A saturated hydrocarbons contains only carbon-carbon single bonds, while an unsaturated hydrocarbon contains one or more carbon-carbon double or triple bonds. d. A saturated hydrocarbon is used mainly in cheaper forms of gasoline for vehicle use, while unsaturated hydrocarbons composed most of the gasoline formulas, used by current gasoline manufacturers.

c. A saturated hydrocarbons contains only carbon-carbon single bonds, while an unsaturated hydrocarbon contains one or more carbon-carbon double or triple bonds.

Calculate the number of moles of sulfuric acid that will be needed to form 65 grams of calcium sulfate calcium carbonate? Group of answer choices a. 1.665 b. 3.243 c. 0.480 d. 2.560

c. 0.480

A 1.60-g sample of a mixture of naphthalene and anthracene is dissolved in 20.0 g benzene. The freezing point of the solution is 2.810 What is the composition as mass percent of the sample mixture? Group of answer choices a. 57% naphthalene b. 36% naphthalene c. 44% naphthalene d. 60% naphthalene

c. 44% naphthalene

Determine whether the following statements are TRUE or FALSE. a) For all adiabatic processes, the entropy change of the system must be zero b) For one component system, it is possible for two phases in equilibrium to have different chemical potentials. c) The change in Gibb’s free energy can be negative for a cyclic process. d) A condition for equilibrium is that(∆A) T, F =0 Group of answer choices a. T, F, T, F b. T, T, T, T c. F, T, F, T d. F, F, F, F

a. T, F, T, F

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

d. 4.49 eu

Are the following processes exothermic or endothermic? a) When solid KBr is dissolved in water, the solution gets colder. b) Natural gas (CH4) is burned in a furnace. c) When concentrated H2SO4 is added to water, the solution gets very hot. d) Water is boiled in a teakettle. Group of answer choices a. endothermic, exothermic, endothermic, endothermic b. exothermic, exothermic, endothermic, endothermic c. exothermic, exothermic, exothermic, endothermic d. endothermic, exothermic, exothermic, endothermic

d. endothermic, exothermic, exothermic, endothermic

Determine the molecular weights of glucose and urea respectively. Group of answer choices a. 180 amu; 60 amu b. 84 amu; 38 amu c. 96 amu; 36 amu d. 120 amu; 72 amu

a. 180 amu; 60 amu

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

d. 2, 9, 4, 6, 2

Notation on alkane containing Cl Group of answer choices a. chlorate b. chloride c. chloric d. chloro

d. chloro

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

d. it becomes vapor

The mass percent of carbon in a typical human is 18%, and the mass percent of 14C in natural carbon is 6x 10-10%. Assuming a 180-lb person, how many decay events per second occur in this person due exclusively to the beta particle decay of 14C. a. 4500 decay/s b. 2700 decay/s c. 1900 decay per s d. 3800 decay per s

d. 3800 decay per s

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. methane, methane b. propane, propane c. propane, methane d. methane, propane

c. propane, methane

Calculate the ultimate BOD in ppm and k in /day. Time (days) BOD (mg/L) 2 10 4 16 6 20 a. 20 ppm, 0.21/d b. 35 ppm, 0.18/d c. 27 ppm, 0.23/d d. 33 ppm, 0.15/d

c. 27 ppm, 0.23/d

In year 2, the farmer plans to plant soybeans. No manure is to be applied during this crop year. The soybean is a legume and can fix adequate atmospheric nitrogen to produce the desired yield of soybeans. Additional nitrogen fertilizer does not produce significant yield increases. Soybeans require 50 kg N –(hectare)-1, 35 kg P -(hectare) −1, and 225 kg K - (hectare)−1 according to the local extension agent. Estimate the remaining phosphorus after the corn is harvested. The corn crop from year 1 would have removed 52 kg of P2O5– hectare-1 and 38 kg of K2O - hectare−1. a. 48.5 kg / hectare b. 77.3 kg / hectare c. 50.7 kg / hectare d. 36.9 kg / hectare

b. 77.3 kg / hectare

A deer eats 25 kg of herbaceous material per day. The herbaceous matter is approximately 20% dry matter (DM) and has an energy content of 10 MJ (kg DM)−1. Of the total energy ingested per day, 25% is excreted as undigested material. Of the 75% that is digested, 80% is lost to metabolic waste products and heat. The remaining 20% is converted to body tissue. Calculate the percentage of energy consumed that is converted to body tissue. a. 20% b. 24% c. 15% d. 19%

c. 15%

The discharge pipe from a sump pump in the dry well of a sewage lift station did not drain properly and the water at the discharge end of the pipe froze. A hole has been drilled into the ice and a 200-W electric heater has been inserted in the hole. If the discharge pipe contains 2 kg of ice, how long will it take to melt the ice? Assume all the heat goes into melting the ice. a. 43 min b. 56 min c. 39 min d. 68 min

b. 56 min

A contaminated soil is to be excavated and treated in a completely mixed aerated lagoon at a Superfund site. To determine the time it will take to treat the contaminated soil, a laboratory completely mixed batch reactor is used to gather the following data. Determine the time to achieve 99% reduction in the original concentration. Time (d) Waste Concentration (mg/L) 1 280 16 132 a. 48 days b. 92 days c. 36 days d. 75 days

b. 92 days

Mr. and Mrs. Konzzumer have no children. In an average week they purchase and bring into their house approximately 50 kg of consumer goods (food, magazines, newspapers, appliances, furniture, and associated packaging). Of this amount, 50% is consumed as food. Half of the food is used for biological maintenance and ultimately released as CO2; the remainder is discharged to the sewer system. The Konzzumers recycle approximately 25% of the solid waste that is generated. Approximately 1 kg accumulates in the house. Estimate the amount of solid waste they place at the curb each week. a. 22 kg b. 18 kg c. 12 kg d. 25 kg

b. 18 kg

The following data was obtained for an enzymatic reaction. Determine vmax and Km. Initial Substrate Concentration (mM) Vo (micro gram /h) 0.5 40 1.0 75 2.0 139 3.0 179 4.0 213 6.0 255 7.5 280 10.0 313 15.0 350 a. 526x10^-6 g/h, 6.05 mM b. 186x10^-6 g/h, 5.36 mN c. 367x10^-6 g/h, 2.14 mN d. 409x10^-6 g/h, 8.49 mN

a. 526x10^-6 g/h, 6.05 mM

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 0 10.0 1 8.56 2 8.14 4 6.96 8 6.77 10 5.46 20 4.23 40 1.26 880 0.218 a. third b. second c. first d. zero

c. first

If a wastewater has a soluble orthophosphate concentration of 4.00 mg · L−1 as P, what theoretical amount of ferric chloride will be required to remove it completely? a. 33 mg/L b. 21 mg/L c. 45 mg/L d. 17 mg/L

b. 21 mg/L

If a particle having a 0.0170-cm radius and density of 1.95 g cm−3 is allowed to fall into quiescent water having a temperature of 4◦C, what will be the terminal settling velocity? Assume the density of water = 1000 kg · m−3. Assume Stokes’ law applies. b. 1.09 x10^-2 m/s c. 5.97 x10^-2 m/s d. 8.44 x10^-2 m/s

a. 3.82 x10^-2 m/s

Given the following temperature and elevation data, determine the stability of the atmosphere. Elevation, m Temperature, 0C 2 14.35 324 11.13 a. neutral b. unstable c. inversion d. stable

a. neutral

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. 6.1 km b. 4.3 km c. 7.9 km d. 5.8 km

d. 5.8 km

Define the relationship between the number of electrons in the valence shell and the number of covalent bonds it forms; a) carbon, b) nitrogen, c) oxygen, and d) hydrogen: a. C = 6 electrons; 13 bonds N = 4 electrons; 2 bonds O = 2 electrons; 1 bond H = 2 electrons; 1 bond b. C = 2 electrons; 4 bonds N= 3 electrons; 3 bonds O = 2 electrons; 2 bonds H = 4 electrons; 3 bonds c. C = 4 electrons; 4 bonds N = 5 electrons; 3 bonds O = 6 electrons; 2 bonds H = 2 electrons; 2 bonds d. C = 5 electrons 2 bonds N = 6 electrons: 4 bonds O = 3 electrons; 1 bond H = 2 electrons; 3 bonds

c. C = 4 electrons; 4 bonds N = 5 electrons; 3 bonds O = 6 electrons; 2 bonds H = 2 electrons; 2 bonds

A magician rotates a pail of water in a vertical circle with a radius of 0.50 meter amazes the audience because no water spilled out. What is the minimum speed at which no water will spill out? a. 3.13 m/sec/2 b. 6.4 m/sec/22 c. 7.2 m/sec/2 d. 1.23 m/sec/2

a. 3.13 m/sec/2

A chemical engineering professor recorded her household waste generation as shown below. If a container volume is 0.076 cubic meter, what is the average density of the solid waste produced the household. Each empty container has a mass of 3.61 kilograms. Date Can Number Gross mass, kg container and solid) 3/20/2020 1 7.25 2 7.75 3/28/2020 1 10.90 2 8.20 3 7.30 4/10/2020 1 6.40 2 8.23 3 8.65 a. 75.21 kg/cu. m b. 49.87 kg/cu. m c. 66.32 kg/cu. m d. 58.50 kg/cu. m

d. 58.50 kg/cu. m

Fatty acid 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 acid should people avoid ingesting, saturated or unsaturated and why? a. Unsaturated, because the risk of cardiovascular disease is increased. b. Both fatty acids, because the risk of cardiovascular disease is increased. c. Saturated, because the risk of cardiovascular disease is increased. d. Fatty acids are safe to ingest.

c. Saturated, because the risk of cardiovascular disease is increased.

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 b. acetic acid c. ethanol d. benzene

c. ethanol

40 mL of an acetic acid solution of unknown concentration is titrated with 0.10 M NaOH. After 20 mL of the base solution has been added, the measured pH in the titration flask is 5.10. What was the concentration of the initial acid solution? b. 0.09 M c. 0.05 M d. 0.03 M

a. 0.07 M

In electrochemistry, specific conductance is defined as (1000/N)x K, where N is the normality of the salt solution and K is the specific conductance, current is carried by oth anions and cation to a different degree. Thus the equivalence of a salt is the sum of the ionic conductances of the cation and anion. If the ionic conductance of Na+ is 50.1 and that chloride is 76.3 what is the estimated concentration of NaCl in mg/L? The specific conductance of NaCl is 125 x 106. a. 38 b. 29 c. 58 d. 49

c. 58

What is the pH at the equivalence point for titration of 30 mL of a 0.20 M C6H5OOH solution with 0.30 M KOH (Ka of C6H5COOH is 6.5x10-5? a. 8.63 b. 9.12 c. 6.39 d. 7.56

a. 8.63

Patients undergoing an upper gastrointestinal tract laboratory test are typically given an X-ray contrast agent that aids with the radiologic imaging of the anatomy. One such contrast agent is sodium diatrizoate, a nonvolatile water-soluble compound. A 0.378-m solution is prepared by dissolving 38.4 g sodium diatrizoate (NaDTZ) in 1.60 x10^2 mL water at 31.2degC (the density of water at 31.2 degC is 0.995 g/cm3. What is the molar mass of sodium diatrizoate? a. 715 g/mol b. 639 g/mol c. 450 g/mol d. 584 g/mol

b. 639 g/mol

Do isotopes of the heavy elements (for example, those from atomic number 37 to 53) contain more, the same, or fewer neutrons than protons? a. more b. none of these c. fewer d. same

a. more

In Japan, high-speed “bullet trains” move with an average speed of 220 km/h. If Dallas and Los Angeles were connected by such a train, how long would it take to travel nonstop between these cities (a distance of 1490 miles)? a. 15.6 hours b. 10.9 hours c. 11.7 hours d. 14.2 hours

b. 10.9 hours

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

d. absorb neutrons generated in the fission process.

An aqueous solution of an unknown salt of ruthenium is electrolyzed by a current of 2.50 A passing for 50.0 min. If 2.618 g Ru is produced at the cathode, what is the charge on the ruthenium ions in solution? a. +4 b. +5 c. +6 d. +3

d. +3

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. 190 m^2, 16 m and 1.7 m b. 150 m^2, 15 m and 1.9 m c. 260 m^2, 12 m and 2.3 m d. 220 m^2, 10 m and 2.8 m

a. 190 m^2, 16 m and 1.7 m

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. 2.33 m b. 3.96 m c. 1.04 m d. 0.85 m

c. 1.04 m