CHEM 74815 | Course Paper

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Which shows the Lewis structure of water with the correct partial charges and

nonbonding electrons?

How many bromide ions can combine with one ion of aluminum to form an ionic

compound?

A. 3

B. 6

C. 1

D. 2

Which corresponds to the composition of the ion typically formed by magnesium?

A. A

B. B

C. C

D. D

Electrolysis is a process that

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A. produces an electrical current while decomposing water into hydrogen gas and

oxygen gas.

B. requires an electrical current to decompose water into hydrogen gas and oxygen gas.

C. produces heat energy while decomposing water into hydrogen gas and oxygen gas.

D. requires heat energy to decompose water into hydrogen gas and oxygen gas.

A student wants to prepare exactly 250 mL of a 0.500 M aqueous potassium hydroxide

solution. What mass of potassium hydroxide (molar mass = 56.10 g/mol) must the

student dissolve in the 250 mL of solution?

A. 56.1 g

B. 28.1 g

C. 14.0 g

D. 7.01 g

In a refinery, the components of petroleum are separated by

A. combustion reactions.

B. crystallization.

C. fractional distillation.

D. isomerization.

A particular sample of air is 2.5% water vapor. Express the concentration of water

vapor in parts per million (ppm).

A. 0.0000025 ppm

B. 0.025 ppm

C. 250 ppm

D. 25000 ppm

What factors are considered in determining the global warming potential for a particular

molecule?

I. Relative contribution of a molecule of gas to global warming

II. Lifetime in the atmosphere

III. Atmospheric concentration

A. I only

B. I and II only

C. I and III only

D. II and III only

A protein is a linear polymer composed of

A. sugar-amino acid-sugar-amino acid.

B. base-sugar-base-sugar.

C. amino acid-amino acid.

D. lipid-base-lipid-base.

In the petroleum industry, what does a refinery do?

A. It separates crude oil into fractions consisting of compounds with similar boiling

points.

B. It separates crude oil from the coal with which it is almost always found.

C. It mixes natural gas or coal with crude oil in order to remove the impurities from the

crude oil.

D. It produces the machinery by which crude oil is removed from the ground.

Although greenhouse gases likely account for the problem of global warming, they are

also responsible for making earth habitable. What would be the temperature on earth in

the absence of the effects of carbon dioxide and water?

A. 450C

B. 15C

C. -18C

D. -270C

In which part of the bodydoes radioactive I-131 accumulate?

A. liver

B. pituitary gland

C. thyroid gland

D. adrenal glands

The conclusion that it is impossible to completely convert heat into work without

making other changes in the universe is

A. based on erroneous observations.

B. the concept that increasing entropy characterizes all changes in the universe.

C. another way of stating that all energy is either thermal energy or heat.

D. the second law of thermodynamics.

Is nuclear power generation associated with producing greenhouse gases?

A. No, it is greenhouse gasemissions free.

B. Yes, but from obtaining the fuel.

C. Yes, they produce as much or more greenhouse gas as a coal plant.

Vitamin C (ascorbic acid) must be supplied daily in the diet. Why?

A. to keep you from catching cold

B. to keep your bones strong

C. to keep you from getting pellagra

D. to keep you from getting scurvy

WUKF FM transmits at 93.5 MHz. What is the wavelength of the electromagnetic

radiation that carries the station’s signal?

A. 6.42 109 m

B. 3.21 m

C. 3.21 106 m

D. 3.12 1015 m

Which synthetic polymer is used to makeshatter-resistant bottles and fleece fabric?

A. PET

B. HDPE

C. PVC

D. PS

Which equation correctly shows the breakdown of glucose by the body?

A. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + energy

B. C12H24O2 + 17 O2 → 12 CO2 + 12 H2O + energy

C. C12H22O11 + 12 O2 → 12 CO2 + 11 H2O + energy

D. 6 CO2 + 6 H2O → C6H12O6 + 6 O2 + energy

The ability of a molecule to absorb infrared radiation is measured with IR

spectrometers, which report the frequency of light absorbed in units of cm1. Which

explanation best describes this unit?

A. the distance traveled by light of a specific frequency in 1 second

B. the number of wavelengths in 1 cm for a specific frequency of light

C. the wavelength of a specific frequency of light

D. the speed of a specific frequency of light

Which of the following has the highest MCL in drinking water in the US?

A. Nitrates

B. Trihalomethanes

C. Lead

D. Mercury

It is the _____ electrons that account for many of the chemical and physical properties

of elements.

A. innermost

B. intermediate

C. outermost

D. transitional

Which would be classified as a “natural” polymer?

A. cellulose

B. polystyrene

C. polyester

D. nylon

Two amino acids combine to form a dipeptide when the amino group of one reacts with

the acid group of the other. Which structure is correct?

What is the molarity of sodium chloride in a solution containing 0.50 mol of sodium

chloride in 500 mL of water?

A. 0.25 M

B. 0.50 M

C. 1.0 M

D. 5.0 M

In this electrochemical cell, the reduction half reaction is

A. Cu2+(aq) + 2 e → Cu(s)

B. Zn(s) → Zn2+(aq) + 2 e

C. Zn(s) → Cu(s)

D. Cu2+(aq) → Zn2+(aq)

In order to make useful predictions, which factors must be accounted for by climatic

models?

I. Cooling effect of atmospheric aerosols

II. Smoke, haze, and cloud cover

III. Change in land use

IV. Combustion of fossil fuels

A. IV only

B. II and III only

C. III and IV only

D. I, II, III, and IV

Which reaction accounts for the fact that the pH of rain is naturally slightly acidic?

A. CO2 + H2O → H+ + HCO3

B. SO3 + H2O → 2 H+ + SO42

C. Ca2+ + CO2 + H2O → CaCO3 + 2 H+

D. NO2 + H2O → 2 H+ + NO3

Which Lewis structure for formaldehyde (CH2O) is correct?

A. A

B. B

C. C

D. D

In the petroleum industry, what does a refinery do?

A. It separates crude oil into fractions consisting of compounds with similar boiling

points.

B. It separates crude oil from the coal with which it is almost always found.

C. It mixes natural gas or coal with crude oil in order to remove the impurities from the

crude oil.

D. It produces the machinery by which crude oil is removed from the ground.

Most aquatic life in lakes cannot survive in water with a pH less than

A. 9.

B. 8.

C. 6.

D. 5.

Polyvinyl chloride (PVC) is used in

A. water bottles.

B. CD cases.

C. milk cartons.

D. plumbing pipe.

Based on this reaction and its energy profile,

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

the reaction

A. is exothermic.

B. is endothermic.

C. has a high activation energy.

D. violates the first law of thermodynamics.

The burning characteristics of a gasoline can be improved by converting the octane it

contains into isooctane. This conversion requires the use of expensive catalysts such as

A. biological enzymes.

B. gold and titanium.

C. platinum and palladium.

D. ultraviolet radiation.

What herb is reported to have mood-elevating activity?

A. chamomile

B. ginko biloba

C. lemon balm

D. St. John’s wort

Although coal is a complex mixture of substances, its elemental composition can be

approximated by the formula C135H96O9NS. Using this formula, predict the amount of

CO2 released from the combustion of 1.00 x 106 metric tons of coal (about the annual

average for a coal-fired power plant). 1 metric ton = 1 x 103 kg

A. 3.66 x 109 kg

B. 3.11 x 109 kg

C. 8.50 x 108 kg

D. 3.11 x 105 kg