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Chris M.
Chris M., M.S.W. Social Work
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Experience:  Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)
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1. Two pairs of shared electrons are: (Points: 5)

        single bond.

        double bond.

        triple bond.

        resonance forms of bonding.



2. The constant speed at which light and other forms of radiation travel is: (Points: 5)







3. If energy decreases, the wavelength of light increases and the frequency: (Points: 5)



        stays constant.




4. The likelihood of developing nonmelanoma skin cancers is dependent on all of the following factors, EXCEPT: (Points: 5)

        stratosphere ozone concentration.

        latitude in which you live.

        ethnicity and skin color.

        longitude in which you live.



5. What compounds make up chlorofluorocarbons? (Points: 5)

        Bromine, Iodine, Chlorine

        Cl, F, C

        Bromine and Iodine

        C, Fr, Cr



6. Based on Figure 2.25 on page 102, concentrations of effective chlorine in the stratosphere are projected to drop to approximately __________ parts per million by 2010. (Points: 5)







7. Which of the following best explains the condition of enhanced greenhouse effect? (Points: 5)

        81% of the radiation penetrating Earth's atmosphere is of shorter wavelengths.

        UV-A and UV-B radiation exceeds 81% of the 1950 benchmark.

        infrared energy return to the earth is greater than 81%.

        re-radiation to outer space exceeds 81%.



8. Atomic structures exemplified by ozone that do not neatly fit Lewis structures are called __________. (Points: 5)

        covalent bonds

        polyatomic molecules

        resonance forms

        triple bonds



9. Use the periodic table on page 17 to calculate the mass percent of Carbon (C) in Carbon dioxide (C02). (Points: 5)

        27.3% C

        42% C

        37.5% C

        100% C



10. What molecules have been increasing in the atmosphere for decades and have contributed

to an elevated global temperature? (Points: 5)

        Ammonium sulfate

        Sulfur dioxide

        Carbon dioxide




11. Which of the following best explains why holes in the ozone layer appear predominantly over the South Pole? (Points: 5)

        Formation of ice crystals in stratospheric clouds during the long winters provide surfaces that convert otherwise safe molecules into those that deplete ozone.

        Because of their polarization, free radical chlorine atoms are attracted to the southern magnetic pole where they more effectively serve as catalysts.

        Chlorofluorocarbons combine with higher concentrations of chlorinated carbon compounds from natural sources that are more prevalent in Antarctica.

        Ozone depletion occurs equally all over the globe, but the ozone layer is naturally thinner over Antarctica.



12. Major substances involved with global warming include all of the following, EXCEPT: (Points: 5)







13. The term _____ is defined as containing an Avogadro's number of objects. (Points: 5)







14. A radical chlorine atom acts like a(n) __________ because it participates in a chemical reaction that destroys ozone, influencing its speed without undergoing permanent change. (Points: 5)







15. If  sulfur atoms combine with 1 mole of diatomic oxygen, how many moles of sulfur dioxide are produced? (Points: 5)







16. In the periodic table, which elements typically have similar properties? (Points: 5)

        Those in the same rows

        Those related diagonally

        Those in the same columns

        Those on opposite sides



17. The nucleus of an atom contains: (Points: 5)

        electrons and protons only.

        protons only.

        electrons, protons, and neutrons.

        protons and neutrons only.



18. Isotopes of an element have the same number of: (Points: 5)

        electrons, but different numbers of protons.

        protons, but different numbers of neutrons.

        neutrons, but different numbers of protons.

        protons, but different numbers of electrons.



19. Which explanation accounts for the fact that, on average, cloudy nights are warmer than clear nights? (Points: 5)

        Clouds reflect light incoming from the moon.

        H2O does not absorb infrared energy.

        Clouds are composed of water vapor and H2O is a strong greenhouse gas.

        Clouds have a high concentration of carbon dioxide from fossil fuel combustion.



20. The carbon cycle refers to: (Points: 5)

        the mechanism by which carbon dioxide causes global warming.

        the frequency of light energy that affects the rotational energy of carbon dioxide.

        the oxidation of glucose to form carbon dioxide and water.

        the movement of carbon through living organisms, the atmosphere, the sea, and the earth.


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