Polyvinyl chloride (PVC) is used in
A. water bottles.
B. CD cases.
C. milk cartons.
D. plumbing pipe.
There are approximately 2 x 1022 molecules and atoms in each breath we take and the
concentration of CO in the air is approximately 9 parts per million. Approximately how
many CO molecules are in each breath we take?
3-11-2013
A. 2 x 1015
B. 1.8 x 1017
C. 2 x 1016
D. 2 x 1029
Which solution is acidic?
A. MOH = 0.0065 M
B. MH+ = 1.27 109 M
C. MH+ = 5.79 1010 M
D. MOH = 1.77 1010 M
Neither N2 nor O2 are greenhouse gases because
A. N2 and O2 react with one another, producing N2O2 when exposed to infrared
radiation.
B. their overall electric charge distribution does not change when they vibrate.
C. infrared radiation causes their bonds to break.
D. their atmospheric concentrations are not changed by human activity.
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
A major advantage of a fuel cell over a standard battery is that
A. as long as oxygen and fuel are supplied, a fuel cell will not “run down” like a battery
will.
B. a fuel cell generates electricity without the need for an oxidation-reduction reaction.
C. a fuel cell is 100% efficient at generating electricity, whereas a battery is less than
1% efficient.
D. as it generates electricity, a fuel cell produces more fuel than it uses.
Concerning dietary supplements, which of the following statements is true?
A. They are not reviewed by the FDA before they are marketed.
B. They are classified as “food and drugs.”
C. They are assessed for purity by the DSHEA before they are marketed.
D. They are required not to interact with traditional medicines.
The O-to-O-to-O bond angle in an ozone (O3) molecule is not exactly 120 because
A. ozone molecules are linear so the bond angle is 180.
B. ozone molecules are tetrahedral so the bond angle is approximately 109.
C. the nonbonding electron pair occupies greater space than the bonding pairs.
D. the electrons in the double bond occupy more space that the nonbonding electron
pair.
Weapons-grade uranium is approximately
A. 30% U-235
B. 60% U-235
C. 90% U-235
D. 90% U-239
Deoxyribose is the ______ in DNA.
A. ribonucleotide
B. deoxyribonucleotide
C. sugar
D. phosphate
Depleted uranium
A. is all U-235
B. is all U-238
C. is mostly, but not all U-238
D. is mostly, but not all U-235
Why did the industrial-scale production of ammonia from nitrogen and hydrogen
present a difficult challenge?
A. Ammonia is explosive.
B. Nitrogen is difficult to purify.
C. Nitrogen is unreactive.
D. Hydrogen is unreactive.
The nucleus of an atom contains
A. electrons and protons only.
B. protons only.
C. electrons, protons, and neutrons.
D. protons and neutrons only.
Which diagram(s) best represent(s) only diatomic molecules?
A. I only
B. II only
C. I and II only
D. II and IV only
Which explanation accounts for the fact that, on average, cloudy nights are warmer than
clear nights?
A. Clouds reflect light incoming from the moon.
B. H2O does not absorb infrared energy.
C. Clouds are composed of water vapor and H2O is a strong greenhouse gas.
D. Clouds have a high concentration of carbon dioxide from fossil fuel combustion.
Calculate the mass of CO2 produced by the combustion of a tank of gasoline. Assume
the mass of gasoline is 46.0 kg and that gasoline is pure octane (C8H18);
A. 142 kg
B. 17.8 kg
C. 32.3 kg
D. 46.0 kg
If the adenine (A) content of DNA is 33%, what is its guanine (G) content?
A. 33%
B. 17%
C. 50%
D. 22%
What functional groups are common to both of structures below?
A. acid
B. alcohol
C. amide
D. amine
A 2- ion has 36 electrons and 45 neutrons.What is its correct symbol?
A. 83Sr2-
B. 71Br2-
C. 79Se 2-
D. 78As 2-
Which is/are part of the Chapman cycle in the stratosphere?
I. Ozone is removed by its reaction with water vapor.
II. Ozone is removed by an interaction with UV radiation.
III. Ozone reacts with oxygen atoms to form oxygen molecules.
A. I only
B. II only
C. I, II and III
D. II and III only
The ________ concentration in the air over the desert differs dramatically from that in
the air in the tropical rainforest.
A. N2
B. O2
C. CO2
D. H2O
Silicon has 4 electrons in its outer energy level, gallium has 3. Adding small amounts of
gallium to pure silicon
A. destroys the ability of the silicon to act as a semiconductor.
B. provides the basis for using the silicon as a fuel cell.
C. creates a p-type semiconductor.
D. creates an n-type semiconductor.
During the Antarctic spring, ozone is destroyed at a greater rate than it is formed
A. on the surface of atmospheric ice crystals.
B. in a process that is catalytic.
C. in polar stratospheric clouds.
D. All of these choices are correct.
Which activity would a 70-kg person need to do to “burn off” a meal consisting of a
hamburger (350 Calories), 3 oz of potato chips (1 oz = 108 Calories), and 2 beers (1
“regular” beer = 100 Calories)?
A. golf for 3 hours
B. hike for 2 hours
C. run for 1 hour
D. swim for 1 hour
One approach to encourage more recycling is to institute a “bottle bill.” What is a bottle
bill?
A. a bill that outlaws the use of plastic bottles
B. a “container deposit law” that requires customers to pay a deposit for the bottle
C. a large container for recycling bottles
D. a bill that requires equal use of plastic and glass in bottles
Oxygenated gasolines are blends of petroleum-derived compounds with
oxygen-containing compounds. Which of the following oxygenated compounds has
been discontinued in some states because of potential health risks?
A. ethanol
B. methanol
C. MTBE
D. methane
Results of the Montreal protocol include
A. greatly reduced production of CFCs.
B. increased production of alternatives to CFCs.
C. recycling of CFCs.
D. All of these choices are correct.
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
Which synthetic polymer has two forms, “crystal” and “expandable”?
A. PET
B. HDPE
C. LDPE
D. PS
The main reason that water supplies are “chlorinated” is
A. to produce gels that remove solids from the water.
B. to kill disease-causing organisms in the water.
C. to soften the water.
D. to precipitate lead salts from the water as insoluble lead chloride.
The “Big Six” polymers are all classified as thermoplastics because they
A. are all used as insulators.
B. can be melted and shaped.
C. are all crystalline.
D. are all amorphous.
Which is the most abundant mineral in the body?
A. calcium
B. magnesium
C. potassium
D. sodium
What type of radiation is given off in this nuclear reaction?
A. alpha
B. beta
C. gamma
D. neutron