Cem 65702 | Course Paper

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Numbers 1 through 4 are used to identify four different elements. Based on periodic

table trends, which number identifies the element that is expected to have the greatest

tendency to attract a shared pair of electrons?

A. 1

B. 2

C. 3

D. 4

The backbone structure of DNA is

A. sugar-base-sugar-base.

B. base-phosphate-base-phosphate.

C. base-base-base-base.

D. sugar-phosphate-sugar-phosphate.

Which of the following has the lowest albedo?

A. Ocean

B. Fresh snow

C. Old snow

D. Desert sand

The process by which a solution is heated to its boiling point and the vapors are

condensed and collected is known as

A. combustion.

B. cracking.

C. crystallization.

D. distillation.

Coal is not a pure chemical compound, but its elemental composition can be

approximated by the formula C135H96NO9S. What is the approximate percentage by

mass of sulfur in coal?

A. 0.413%

B. 1.68%

C. 3.11%

D. 42.8%

Which of these represents the best Lewis structure for acetylene (C2H2)?

A. A

B. B

C. C

D. D

When the ________molecules of ethanol, C2H5OH, are added to water, the ethanol

molecules ________.

A. nonpolar; are attracted to the nonpolar water molecules.

B. polar; form hydrogen bonds with the polar water molecules.

C. polar; form covalent bonds with the polar water molecules.

D. nonpolar; are not attracted to the polar water molecules.

Which molecule(s) contain(s) polar covalent bonds, but is(are) nonpolar?

A. I only

B. III only

C. II and IV only

D. I and III only

Chlorofluorocarbons rise to the stratosphere and

A. react directly with stratospheric ozone to destroy it.

B. interact with UV energy to produce free radicals that destroy ozone.

C. interact with UV energy to produce free radicals that react with oxygen to create

ozone.

D. react with free radicals to remove carbon dioxide.

Ozone is considered an air pollutant in the ________ but is a valuable protective layer

in the __________.

A. troposphere; stratosphere

B. stratosphere; mesosphere

C. stratosphere; troposphere

D. mesosphere; stratosphere

The production of nickel and copper metals from their ores involves sulfur dioxide

emissions because

A. the ores of these elements are composed primarily of NiSO2 and CuSO2.

B. the ores of these elements are composed primarily of NiS and CuS.

C. to release the metals from their ores, the ores are heated with sulfur-containing coal.

D. the release of metals from their ores involves the reaction of SO3 with the ore.

Which functional groups include a nitrogen atom?

I. Carboxylic Acid

II. Ester

III. Amide

IV. Amine

A. I and II only

B. I and IV only

C. II, III and IV only

D. III and IV only

The atomic number is the

A. same as the mass number of an atom.

B. number of protons in a nucleus.

C. number of protons and neutrons in a nucleus.

D. number of neutrons in a nucleus.

Reverse osmosis is illustrated in this diagram. What is this process used for?

A. to purify water by ion exchange

B. to remove dissolved salts from sea water

C. for the ozonation of water supplies

D. to add fluorine to municipal water supplies

This is a representation of a plastic bag being stretched. Which statement best describes

what is happening in the figure?

A. Molecular chains shift from a random orientation to align parallel to each other in

the direction of the pulling force.

B. During the pulling, the mixed-up polymer chains cross link to make the polymer

stronger.

C. The pulling force creates branches, causing a switch from high density to low density

polymer.

D. It is only a temporary distortion; once the pulling force stops, the plastic snaps back

to the original orientation.

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.

Comparing the structures of aspirin, ibuprofen, and acetaminophen, what structural do

they share?

A. acid functional groups

B. amide functional groups

C. benzene rings

D. ester functional groups

Which is the following incorrectly represents a combustion reaction?

A. CH4 + 2O2 → CO2 + 2 H2O

B. S8 + 8 O2 → 8 SO2

C. N2 + 2O2 → 2 NO2

D. C3H8 + O2 → 3 CO2

Bases produce which ions in aqueous solution?

A. OH

B. NO2

C. Cl

D. SO3

Which synthetic polymer is a copolymer?

A. PVC

B. PS

C. HDPE

D. PET

The Prius, a hybrid car produced by Toyota, uses a battery that its makerclaims should

not have to be recharged or replaced during the lifetime of the car. The type of battery

used in the Prius is

A. alkaline.

B. lead acid.

C. nickel-cadmium.

D. nickel-metal hydride.

The quantity 8.7 x 105 g expressed in standard decimal notation is:

A. 0.000087 g

B. 870.000 g

C. 0.0000087 g

D. 870,000 g

This is the Lewis structure for acetic acid. The bond angles are not drawn to scale.

Based on the electronic configuration shown in the Lewis structure, predict the O C

O bond angle, in degrees.

A. 90

B. 109.5

C. 120

D. 180

Bases produce which ions in aqueous solution?

A. OH

B. NO2

C. Cl

D. SO3

Proteins are polymers of amino acids held together by ______ bonds.

A. protein

B. peptide

C. ester

D. acid

Which compound should be the most soluble in water?

Land use changes have a big impact on global warming because of their effect on

albedo. Albedo

A. is the primary wave number at which a greenhouse gas absorbs infrared radiation.

B. describes the effectiveness of a molecule as a greenhouse gas.

C. is the ratio of electromagnetic radiation reflected by a surface to the amount of

radiation hitting that surface.

D. describes the tendency of an atmospheric molecule to react with other atmospheric

molecules, reducing their global atmospheric lifetimes.

Use this table to answer the questions.

Which oil has the greatest amount of monounsaturated fatty acids?

A. corn oil

B. olive oil

C. peanut oil

D. safflower oil

On a Periodic Table, the columns of elements with similar properties are

A. periods.

B. groups.

C. rows.

D. metals.

How does using hydrogen as the fuel in an electric power plant compare with using

hydrogen as the fuel in a fuel cell?

A. H2 used as a fuel in a power plant must be more pure than the H2 used in a fuel cell.

B. Burning H2 in a power plant produces many more pollutants than using H2 in a fuel

cell.

C. A fuel cell using hydrogen operates at a higher overall efficiency than would a power

plant burning hydrogen as a fuel.

D. Using H2 in a fuel cell generates far more heat than burning it in a power plant.

Which is an amine group?

A. OH

B. NH2

C. COOH

D. CONH2

According to the graph below,

the United States production of petroleum has steadily decreased since

A. 1950.

B. 1960.

C. 1975.

D. 1985.

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

models?

I. Aerosol Emissions

II. Land Use

III. Solar Irradiance

A. II only

B. II and III only

C. I and III only

D. I, II, andIII only

Which is the best definition of specific heat?

A. the quantity of heat energy that must be absorbed to cause one gram of a liquid

substance to boil

B. the quantity of heat energy that must be absorbed to increase the temperature of one

gram of a substance one degree Celsius

C. the boiling point of a liquid substance in degrees Celsius

D. the difference between the freezing point and the boiling point of a substance