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
Light behaves like
A. a particle.
B. a wave.
C. both a particle and a wave.
D. neither a particle nor a wave.
Of five major gaseous components of air, which is the only one to vary significantly in
concentration from place to place and from day to day?
A. water vapor
B. carbon dioxide
C. nitrogen
D. argon
In a solar cell, semiconductors of the p-type and n-type are placed in contact with each
other via a conducting wire. In order to generate an electric current, which of the
following must be true?22-2
A. An external battery must be attached
B. Light shining on the system will cause oxidation to occur
C. Light shining on the system must have enough energy to set electrons in motion from
the n-type semiconductors to the p-type
D. Light shining on the system must have enough energy to set electrons in motion
from the p-type semiconductors to the n-type
Why are HFCs environmentally superior to the currently used HCFCs?
A. HFCs are not flammable.
B. HFCs do not contain chlorine.
C. HFCs are lighter and may be transported more easily.
D. HFCs are less reactive than HCFCs.
Which is not a necessary consideration for a battery designed to run a cell phone or
portable MP3 player?
A. It must develop a useful level of electrochemical potential.
B. It must “run” for a reasonable amount of time.
C. It must use liquid, aqueous solutions.
D. It must be fairly light in weight.
Which is the correct Lewis structure of a chlorine atom and the ion that chlorine forms?
A.
B.
C.
D.
How many different tripeptides can be made from a supply of glycine and lysine?
A. 2
B. 3
C. 6
D. 8
The diagram below shows a simplified version of a fractionating column used in the
petroleum industry.
The compounds that are obtained at position D are
A. asphalt.
B. gasoline.
C. jet fuel.
D. refinery gases.
Some steroids are more soluble in water than others. Based on your understanding of
the solubility of molecular compounds in water, decide which compound is the most
soluble.
A.
B.
C.
D.
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
Which is not an example of an over-the-counter medication?
A. cough suppressants, such as dextromorphan.
B. antacids and indigestion aids, such as calcium or magnesium salts.
C. anti-anxiety drugs, such as valium.
D. motion sickness drugs, such as diphenhydramine.
Compounds that reduce fever are called _____; compounds that reduce pain are called
____.
A. analgesics; antipyretics
B. analgesics; hormones
C. antipyretics; analgesics
D. antipyretics; prostaglandins
Which of the following statements is not true about PEM fuel cells?
4-25-2013
A. PEM fuel cells rely on inexpensive catalysts.
B. PEM fuels cells are cleaner than gasoline powered vehicles.
C. PEM fuel cells have safe and efficient fuel storage.
D. PEM fuel cells have limited driving range.
A monomer is
A. a single polymer chain.
B. a polymer made from only one component.
C. a small molecule used to make a polymer chain.
D. a polymer molecule that only contains a single element.
Which synthetic polymer has two forms, “crystal” and “expandable”?
A. PET
B. HDPE
C. LDPE
D. PS
Which of the following has the longest half-life?
A. U-238
B. U-235
C. C-14
D. Pu-231
An acidic fog in Pasadena was found to have a pH of 2.50. Which expression represents
this pH measurement?
A. MOH = 3.2 1012 M
B. MOH = 3.2 109 M
C. MH+ = 9.7 103 M
D. MH+ = 2.5 M
Which equation correctly shows the first step in the formation of polyethylene
terephthalate (PET) by the process of condensation polymerization?
A.
B.
C.
D.
Hydrogen gas (H2) is a promising alternative to fossil fuels. How many molecules are
present in 1.0 kg of hydrogen gas?
A. 3.0 x 1023
B. 6.0 x 1023
C. 3.0 x 1026
D. 6.0 x 1026
Which type of battery is best for use in heart (cardiac) pacemakers?
A. alkaline
B. lithium-iodine
C. mercury
D. nickel-cadmium
The level of protein structure that involves interactions between the side chains of acid
separated in sequence is
A. primary.
B. secondary.
C. tertiary.
D. double helix.
Which of these is not a realistic risk associated with nuclear power plants?
A. release of radioactivity from spent fuel rods
B. a nuclear explosion
C. a meltdown from loss of coolant
D. thermal pollution of nearby body of water
The pH of lemon juice is approximately 2.40. At this pH, the hydronium ion
concentration is closest to which concentration?
A. 2.5 x 1012 M
B. 4.0 x 103 M
C. 0.38 M
D. 5.6 x 104 M
Which vibrational mode for carbon dioxide is not expected to contribute to the
greenhouse effect?
A.
B.
C.
D.
Approximately what percentage of the electrical energy generated in the United States
is produced from nuclear energy?
A. < 2%
B. 10%
C. 20%
D. 50%
Increasing wavelength of light goes in this order:
A. ultraviolet > visible > infrared.
B. visible > infrared > ultraviolet.
C. infrared > visible > ultraviolet.
D. ultraviolet > infrared > visible.
Nationally, the greatest amounts of NOx in the atmosphere are produced by which of
these?
I. transporation sources (motor vehicles, aircraft, trains)
II. combustion of fuel in electrical utility plants and industry releases
III. nitrification in farm fields
A. I and II only
B. I and III only
C. II and III only
D. I, II, and III
Which corresponds to the composition of the ion typically formed by magnesium?
A. A
B. B
C. C
D. D
Although coal is a complex mixture of substances, its elemental composition can be
approximated by the formula C135H96O9NS. Using this chemical formula, calculate the
percentage, by mass, of carbon (C) in coal.
A. 85%
B. 67%
C. 56%
D. 20%