Which of the following is a proper use for a calorimeter?
A. Measuring heat of combustion
B. Measuring temperature of a mixture
C. Measuring the amount of oxygen consumed in a combustion reaction
D. Measuring entropy of a reaction
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
Which of the following is not carried out by bacteria in soil?
A. Atmospheric nitrogen is fixed in soils.
B. Ammonium is converted into nitrites.
C. Nitrites are converted to nitrates.
D. All of these are carried out by bacteria.
What type of radiation is given off in this nuclear reaction?
A. alpha
B. beta
C. gamma
D. neutron
Consider this table.
How many pounds of plastics were produced per person in 2003?
A. 0.369
B. 3.69
C. 36.9
D. 369
The goal of the Montreal Protocol in 1987 was to
A. reduce the amount of new production of chlorofluorocarbons in developed countries.
B. recycle existing chlorofluorocarbons rather than release them into the air.
C. encourage research into substitutes for chlorofluorocarbons.
D. All of these choices are correct.
In their fourth and most recent report published in 2007, the vast majority of scientists
agreed on several key points. Which of the following is NOT one of those points?
A. If the rate of greenhouse gas emissions is not curtailed, our water resources, food
supply, and even our health will suffer.
B. Human activities (primarily the combustion of fossil fuels and deforestation) are
responsible for much of the recent warming.
C. The Earth is getting warmer.
D. All of the above were mentioned as key points.
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.
Of the following, which radioactive element is found most commonly in our food?
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A. 23Mg
B. 40K
C. 131I
D. 90Sr
What is the maximum one-time dose of radiation one can receive without suffering any
detectable physiological effects?
A. ≤ 25 rem (0.25 Sv)
B. ≤ 50 rem (0.5 Sv)
C. ≤ 100 rem (1.0 Sv)
D. ≤ 200 rem (2.0 Sv)
UV-B radiation has a frequency of approximately 1017 s1. What is the energy of a
photon of this light?
A. 1.99 1042 J
B. 6.63 1017 J
C. 4.19 108 J
D. 1.51 1050 J
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
Which differentiates a compound from a mixture of two or more elements?
A. The elements in a compound may be present in varying proportions.
B. A compound does not exhibit the individual properties of the elements of which it is
composed.
C. A compound is made up of only one element.
D. A compound cannot be made up of more than two elements.
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.
All nine essential amino acids can be found in meat. By employing the nutritional
principle of complementarity, a vegetarian gets all nine. What is complementarity?
A. combining foods that complement each other’s essential amino acids
B. taking essential amino acid supplements to complement the diet
C. complementing a vegetable with a fruit at every meal
D. having milk to complement every meal
Scientists believe they know the average global temperature over the last 160,000 years.
Which property of the ice core samples from Antarctica provides this information?
A. the thickness
B. the carbon dioxide concentration
C. the 1H/2H ratio
D. the temperature
Structurally, how are water soluble and fat soluble vitamins different?
A. Water soluble vitamins have more atoms than fat soluble vitamins.
B. Water soluble vitamins contain polar groups, such as OH and fat soluble do not.
C. Water soluble vitamins always have higher molecular masses than fat soluble
vitamins.
D. Water soluble vitamins are stored in the urine and fat soluble are not.
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
These are the two monomers used to synthesize Kevlar.
Which of the following represent the products formed after one condensation reaction
between the monomers?
A.
B.
C.
D.
What is the structure of the ester that is formed in the following reaction?
A.
B.
C.
D.
Which of these locations would be best suited to geothermal energy as a source to
operate homes?
A. Hawaii
B. Oklahoma
C. Vermont
D. England
The “doping” of a semiconductor to improve its performance means
A. slightly raising the temperature of a pure semiconductor to improve the ability of its
electrons to flow from atom to atom.
B. fusing layers of two different pure semiconductors together to give the electrons that
absorb the solar radiation characteristics of the electrons of both semiconductors.
C. mixing large amounts of a metal with small amounts of a semiconductor so that the
metal itself becomes a semiconductor.
D. adding small amounts of other elements to the pure semiconductor to change the
freedom of electron motion throughout the crystal.
Ethanol (C2H6O) is a common intoxicant and fuel produced from the fermentation of
various grains. How many moles of ethanol are represented by 50.0 kg of ethanol?
A. 1.09 103 mol
B. 46.1 mol
C. 9.00 mol
D. 1.09 mol
The body’s chemical messengers, called _____, are produced in the endocrine glands.
A. enzymes
B. hormones
C. isomers
D. viruses
Calculate the percentage decease in NOx emissions after clean coal technology was
installed at the Milliken power station.
A. 0.4%
B. 40%
C. 60%
D. 160%
The ozone hole is most prominent on the Earth over
A. North America.
B. Europe.
C. Africa.
D. Antarctica.
Reforming processes can store hydrogen fuel in a liquid form as another molecule.
Which of the following cannot be reformed into hydrogen?
A. methanol
B. gasoline
C. diesel
D. carbon dioxide
Most high-level nuclear waste in the United States is currently
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A. sealed deep within the Earth.
B. encased in glass and buried near the surface.
C. sealed at the sites where it was produced.
D. stored at breeder reactors waiting for reprocessing.
Which is the best representation showing a sodium cation in water?
A.
B.
C.
D.
Which symbols represent only elements that are metals?
A. X and Z
B. X and Q
C. P and L
D. X, R, P, and Q
Which of the following is NOT a drawback of using coal for energy production?
A. Mountaintop mining
B. Mercury in fly ash
C. Mining explosions
D. Difficult transportation due to instability
Air is a(n)
A. element.
B. compound.
C. mixture.
D. pure substance.