Which is not a component of a fuel cell?
A. a timer
B. an anode
C. a cathode
D. an electrolyte
Which is the balanced chemical equation showing hydrogen peroxide (H2O2)
decomposing into hydrogen (H2) and oxygen (O2)?
A. H2O2 → H2 + O2
B. H2 + O2 → H2O2
C. 2 H2 + O2 → 2 H2O2
D. 2 H2O2 → 2 H2 + O2
Which equation below shows the addition polymerization of ethylene?
A.
B.
C.
D.
Although the nuclear reactors used to produce electricity do not release carbon dioxide,
nuclear energy is still responsible for the release of this greenhouse gas. Which activity
probably does not contribute largely to the carbon dioxide released by nuclear power
generation.
A. mining and production of uranium fuel rods
B. transportation of nuclear fuel and waste
C. construction of the nuclear reactor facility
D. cooling of the secondary coolant by a large reservoir of water
Cracking is
A. the breaking of larger molecules into smaller ones.
B. the combination of small molecules to form larger molecules.
C. any reaction that is accompanied by the release of heat.
D. any reaction that is accompanied by the absorption of heat.
A polymer that is made from two different monomers is known as a
A. dimer.
B. dipolymer.
C. copolymer.
D. multimer.
Which of the following fission products released from the Chernobyl reactor is
dangerous because it concentrates in bones?
A. I-131
B. Sr-90
C. C-14
D. U-238
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 is not a known advantage of natural gas over other fossil fuels?
A. It burns more completely than other fossil fuels.
B. It burns more cleanly than other fossil fuels.
C. It is far more abundant than any other fossil fuel.
D. Sulfur dioxide is rarely produced by burning natural gas.
The numbers 1 through 4 are used to identify four different elements on the periodic
table. Which element is expected to have 2+ charge when it forms an ion?
A. 1
B. 2
C. 3
D. 4
In the Chapman cycle, ozone formation depends upon a sufficient concentration of
oxygen atoms. Which step in the Chapman cycle produces oxygen atoms?
A. absorption of light (λ ≤ 320 nm) by ozone molecules
B. absorption of light (λ ≤ 320 nm) by oxygen molecules
C. absorption of light (λ ≤ 242 nm) by ozone molecules
D. absorption of light (λ ≤ 242 nm) by oxygen molecules
Human insulin protein
I. is helpful in the treatment of diabetes in humans.
II. controls the levels of glucose in the blood.
III. can be produced in the bacterium, E. coli.
IV.
A. I and II only
B. II and III only
C. I and IV only
D. I, II, and III
The half-life of carbon-14 is 5,730 years. If you started with 100.0 g of carbon-14, how
much would remain after 4 half-lives?
A. 25.0 g
B. 12.5 g
C. 6.25 g
D. 57.3 g
Radon-222
A. is a radioactive gas produced from the decay of radium
B. is naturally occurring
C. is the largest contributor to background radiation
D. all of the above
If you were worried about your cholesterol intake, which breakfast should you not eat?
A. eggs fried in butter with bacon and white toast
B. pancakes with maple syrup
C. yogurt, granola, and fruit
D. cereal with fruit and whole milk
Which is not a benefit associated with nuclear power plants?
A. efficient production of electricity
B. reduction of CO2 in the atmosphere
C. inexpensive to operate
D. helps reduce the levels of acid rain
The internationally accepted atomic mass standard is carbon-12 because this isotope
A. was arbitrarily selected as a convenient standard.
B. is the smallest isotope that could be accurately weighed.
C. is the only isotope with equal numbers of protons, neutrons, and electrons.
D. is the only isotope of carbon that exists.
Both the Clinton and G.W. Bush administrations were unwilling to sign the Kyoto
Protocol. What was their primary objection to the treaty?
A. The target emission levels are not sufficiently low to affect the greenhouse effect.
B. The treaty does not include a provision for trading emission allowances.
C. Developing countries are not required to control greenhouse gas emissions.
D. Enforcement of the treaty will be impossible.
In the year 2000, which two energy sources contributed almost equally to our total
energy usage?
A. coal and natural gas
B. petroleum and natural gas
C. petroleum and nuclear electric power
D. coal and nuclear electric power
The fat soluble vitamins, A, D, E, K, are stored in lipid material. Which statement is
true?
A. These vitamins are not as important as the water soluble ones.
B. These vitamins do not have to be taken daily.
C. Ingesting excess amounts of these vitamins does no harm.
D. These vitamins have to be taken in pill form because they are not usually found in
foods.
Why is it so expensive to ship hydrogen as a liquid as is often done with other gas?
A. Hydrogen is very heavy to ship.
B. Hydrogen is very dense to ship.
C. Hydrogen has to be shipped at a very low temperature.
D. Hydrogen in very flammable.
One of the monomers used to make nylon is 1,6-diaminohexane (also known as
hexamethylene diamine). How many amine ( NH2) groups does it have?
A. none
B. 1
C. 2
D. 6
In this schematic of DNAof a representation, the arrow points to what type of chemical
unit in DNA?
A. nitrogenous base
B. phosphate group
C. monosaccharide
D. deoxyribonucleotide
Thermal pollution is possible at water sources near
5-21-2013
A. coal-burning plants.
B. nuclear plants.
C. both coal-burning and nuclear plants.
D. neither coal-burning nor nuclear plants.
How does the reaction of hydrogen and oxygen to produce energy in a fuel cell differ
from their interaction during the direct combustion of hydrogen and oxygen?
I. The direct combustion of hydrogen and oxygen produces several different products,
whereas the fuel cell produces only water.
II. Much less heat energy is produced in a fuel cell than via direct combustion of
hydrogen and oxygen.
III. In the fuel cell, there is an oxidation-reduction reaction between hydrogen and
oxygen. In the direct combustion of hydrogen and oxygen, there is no such reaction.
IV. It is much easier to control the hydrogen and oxygen during direct combustion than
during their reaction in a fuel cell.
A. I and II only
B. I, II and III only
C. I, II, III and IV
D. I and III only
Morphine, opium and oxycodone are categorized into which”drug schedule”?
A. I
B. II
C. III
D. IV
What is the source of the nitrogen in the NOx emitted from fossil fuel combustion?
A. the atmosphere
B. coal
C. natural gas
D. oil
Predict the geometry of nitrous oxide, N2O (atomic order N N O).
A. linear
B. bent
C. trigonal pyramidal
D. trigonal planar
Which statement is not true?
A. In forming a solution, the solute dissolves other substances that are called solvents.
B. Water is the solvent in an aqueous solution.
C. Pure water does not conduct electricity.
D. Electrolytes dissolved in water produce a solution that can conduct electricity.
The Montreal protocol is a
A. treaty to protect against global warming.
B. treaty to reduce the amount of CFCs produced in the world.
C. list of substitutes for CFCs.
D. way to destroy CFCs in the stratosphere.
Which is produced in the greatest amount from a barrel of petroleum?
A. asphalt and road oil
B. gasoline
C. home heating oil
D. lubricants and waxes
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 quantity 8.7 105 g expressed in standard decimal notation is:
A. 0.000087 g
B. 870.000 g
C. 0.0000087 g
D. 870,000 g
In an electrochemical cell, the anode is
A. the electrode at which oxidation takes place.
B. the material used to connect the two half cells to each other.
C. always used up before the cathode.
D. never a metal.