CEM 72165 | Course Paper

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HCFCs have been developed to replace CFCs as refrigerants. Which property of these

new compounds makes them environmentally superior to CFCs?

A. Greater reactivity leads to decomposition at elevations below the stratospheric ozone

concentration maximum.

B. Lower reactivity makes them stable even in the intense ultraviolet light in the

stratosphere.

C. Their higher molecular weight prevents them from reaching the stratosphere.

D. They do not contain chlorine.

Which would be classified as a ‘synthetic” polymer?

A. cellulose

B. wool

C. rubber

D. nylon

The energy stored in the chemical bonds of fossil fuels is a form of ______ energy.

A. electrical

B. mechanical

C. potential

D. kinetic

What atmospheric component is responsible for the natural acidity of rain?

A. nitrogen

B. ozone

C. oxygen

D. carbon dioxide

Assume that an extremely inefficient electrical utility company delivers electrical

energy to your home from a natural gas-burning power plant with an overall efficiency

of only 31% and your furnace is 85% efficient in converting electrical energy into heat

energy.What mass of natural gas the power plant must burn if heating your home

requires 3.5 x 107 kJ?The heat of combustion of natural gas is 50.1 kJ/g.

A. 2650 kg

B. 8550 kg

C. 2250 kg

D. 10,100 kg

What generalization is true from this data?

A. Males require more calories per day than women.

B. Older people require more calories per day than younger people.

C. There is no relationship between activity level and recommended caloric intake.

D. There is no relationship between gender and recommended caloric intake.

A 2- ion has 36 electrons and 45 neutrons.What is its correct symbol?

A. 83Sr2-

B. 71Br2-

C. 79Se 2-

D. 78As 2-

PET contains what sort of linkage between the monomer units?

A. Ether

B. Ester

C. Amine

D. Peptide bond

In general, which airborne material is not likely to be affected by the filters or indoor air

handling equipment?

A. particulates

B. pollen

C. soot

D. carbon monoxide

“Hard” water in parts of the Midwest may have a calcium ion concentration as high as

400 ppm. What is this calcium ion concentration when expressed as a percentage?

A. 40%

B. 4%

C. 0.4%

D. 0.04%

A proton released by an acid in aqueous solution quickly reacts with water to form a

hydronium ion. What product is formed when a proton reacts with ammonia (NH3)?

A. NH3

B. NH4

C. NH2

D. NH4

Which concentration is consistent with a basic solution?

A. MH+ = 3.2 103 M

B. MOH- = 3.6 109 M

C. MH+ = 9.7 104 M

D. MOH- = 3.4 103 M

The annual radiation dose for most citizens of the United States is between

A. 0 to 0.10 Sv.

B. 0.10 to 0.25 Sv.

C. 0.25 to 0.50 Sv.

D. 0.50 to 1.0 Sv.

Which functional groups are present in all amino acids?

A. amine ( NH2) groups only

B. acid ( COOH) groups only

C. amine and acid groups

D. single and double bonds between carbon atoms

If 500 mL of air contains 2 x 1022 particles (atoms and molecules), how many particles

do you inhale in one day if you breathe 15000 L of air?

A. 2 x 1022

B. 6 x 1026

C. 1.2 x 1027

D. 5 x 1024

Which of the following statements is not true?

A. The generic version of a drug is usually less expensive than the original version.

B. The generic version of a drug cannot be marketed until the patent protection on the

pioneer drug has expired.

C. Generic drugs do not have to duplicate the efficacy and safety testing required of the

counterpart pioneer drug.

D. The FDA requires that the generic drug be bioequivalent to the pioneer drug; that is,

it should deliver the same amount of active ingredient into a patient’s bloodstream at the

same rate.

In general, hydrogen bonds are

A. about ten times stronger than typical covalent bonds.

B. about 1/10 as strong as typical covalent bonds.

C. found in every molecule containing more than one hydrogen atom.

D. found only between H atoms in molecules like H2.

When table sugar (sucrose, C12H22O11) dissolves in water, which type(s) of attraction

between water and sugar molecules occur(s)?

I. hydrogen bonding

II. polar-polar interactions

III. covalent bonding

A. I and II only

B. II and III only

C. I and III only

D. I, II, and III

Which is not a mixture?

A. a jar filled with rocks and sand

B. sea water

C. a glass of Kool-Aid

D. sodium chloride

When I and II react together to make nylon, what are the products of the first

condensation reaction?

In Earth’s atmosphere, where is the ozone layer?

A. troposphere

B. biosphere

C. mesosphere

D. stratosphere

A calorie is defined as exactly 4.184 J. Therefore 1.000 Cal is exactly

A. 41.84 J.

B. 418.4 J.

C. 1000 J.

D. 4184 J.

Cars and trucks produce most of the NOx emissions and they also suffer the deleterious

effects of acid rain. Which negative effects of acid rain affect cars and trucks?

I. decreased gas mileage

II. damage to the paint and finish

III. increased susceptibility to rust

IV. reduced radio reception

A. I and II only

B. I and IV only

C. II and III only

D. III and IV only

The wavelength of light in the visible range is

A. about the size of an atom of carbon.

B. intermediate between the size of an animal cell and a virus.

C. about the diameter of a CD.

D. intermediate between the size of an animal cell and the diameter of a CD.

Compounds with the same chemical formulas but different molecular structures are

called

A. isotopes.

B. isomers.

C. isobars.

D. allotropes.

Electronegativity

5-30-2013

A. is a measure of an atom’s attraction for an electron in a chemical bond.

B. is the total negative charge on a polyatomic anion.

C. is the same for all of the elements in a family or group.

D. decreases from left to right across a period on the periodic table.

At water treatment plants aluminum sulfate and calcium hydroxide are added to

A. neutralize excess ozone.

B. neutralize excess chlorine.

C. remove suspended clay and dust particles.

D. neutralize excess acidity or basicity.

Scientists have correlated average global temperature with atmospheric carbon dioxide

levels for the last 160,000 years using ice cores from Antarctica. How is the carbon

dioxide level determined?

A. by measuring the CO2 concentration in trapped air bubblesin the ice layers

B. by measuring the 18O/16O ratio in the CO2 molecules

C. by extrapolating the CO2 level from the temperature of the ice

D. by extrapolating the CO2 level from the average global temperature

The greatest percentage of background radiation comes from

A. nuclear power plants.

B. medical X-rays.

C. living things.

D. naturally occurring radon.

For safety reasons, high-level nuclear waste (HLW) must be contained

A. for 10 years.

B. for 100 years.

C. until it becomes low-level nuclear waste.

D. permanently.