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| 1 | |
Which is the correct Lewis structure for an atom of carbon? |
| | A) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232420/Image12.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>]]> |
| | B) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232420/Image13.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (2.0K)</a>]]> |
| | C) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232420/Image14.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (2.0K)</a>]]> |
| | D) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232420/Image15.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (2.0K)</a>]]> |
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| 2 | |
Based on your knowledge of the organization of the periodic table, which is not a reasonable ion? |
| | A) | Rb+ |
| | B) | Sr2+ |
| | C) | Br- |
| | D) | N - |
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| 3 | |
The largest percentage of energy from the Sun comes to Earth in the form of |
| | A) | microwaves. |
| | B) | ultraviolet radiation. |
| | C) | infrared radiation. |
| | D) | visible light. |
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| 4 | |
You have seen images of the Earth that show a large area of dark purple centered on Antarctica. Which statement best explains the purple color in these images? |
| | A) | These are real-color photographs showing the sky to be purple rather than blue over the poles. |
| | B) | These are false-color images in which purple represents very low levels of stratospheric ozone. |
| | C) | These are real-color photographs that represent the UV Index in that region. |
| | D) | These are false-color images in which purple represents very high Dobson Unit readings. |
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| 5 | |
Which statement concerning ozone is correct? |
| | A) | Ozone is considered beneficial in the troposphere because it protects us from ultraviolet light but is an air pollutant in the stratosphere. |
| | B) | Ozone is considered an air pollutant in the troposphere but beneficial in the stratosphere because it protects us from ultraviolet light. |
| | C) | Ozone is considered an air pollutant in both the troposphere and stratosphere because of its toxicity. |
| | D) | Ozone is considered beneficial in both the troposphere and stratosphere because it protects us from ultraviolet light. |
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| 6 | |
How many protons, neutrons, and electrons are in a neutral atom of 5224Cr? |
| | A) | protons = 24, neutrons = 24, electrons = 24 |
| | B) | protons = 24, neutrons = 28, electrons = 24 |
| | C) | protons = 24, neutrons = 28, electrons = 28 |
| | D) | protons = 28, neutrons = 52, electrons = 24 |
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| 7 | |
What are polar stratospheric clouds (PSCs)? |
| | A) | PSCs are thin clouds that form in the stratosphere, often containing ice crystals. |
| | B) | PSCs are thin clouds that form in the stratosphere, often containing CFCs. |
| | C) | PSCs are very dense clouds that form in the stratosphere, often containing ice crystals, sulfuric acid, and hydrochloric acid. |
| | D) | PSCs are very dense clouds that form only in Antarctica, obscuring visibility because the embedded ice crystals. |
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| 8 | |
Which is a correct Lewis structure for ozone? |
| | A) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232420/Image16.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>]]> |
| | B) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232420/Image17.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (6.0K)</a>]]> |
| | C) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232420/Image18.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>]]> |
| | D) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232420/Image19.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>]]> |
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| 9 | |
Diamond, graphite, and fullerenes (buckyballs), all forms of carbon, are examples of |
| | A) | catalysts. |
| | B) | isotopes. |
| | C) | structural isomers. |
| | D) | allotropes. |
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| 10 | |
Which lists types of radiation in order of increasing wavelength? |
| | A) | ultraviolet light, visible light, x-rays, microwaves |
| | B) | visible light, x-rays, infrared radiation, radio waves |
| | C) | radio waves, infrared radiation, x-rays, gamma rays |
| | D) | microwaves, radio waves, visible light, x-rays |
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| 11 | |
How many non-bonded electron pairs are on the oxygen atom in the Lewis structure for carbon monoxide, CO? |
| | A) | four |
| | B) | three |
| | C) | two |
| | D) | one |
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| 12 | |
The Chapman cycle describes the formation and destruction of ozone in the stratosphere. Which statement is true for this natural cycle? |
| | A) | Ozone is formed by reaction of an oxygen molecule with an oxygen atom. |
| | B) | Ozone is destroyed by reaction with the free radical Cl•. |
| | C) | Ozone is formed in the cycle by the reaction of three oxygen atoms. |
| | D) | Ozone is destroyed by the absorption of an appropriate wavelength of infrared light. |
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| 13 | |
A certain brand of skin moisturizer advertises that it contains SPF 15 Sunscreen that protects from UV-A and UV-B rays. Why isn't UV-C mentioned in its product claims? |
| | A) | UV-C radiation is not absorbed by ozone, so it has no connection to the story of increased exposure to UV rays or ozone depletion. |
| | B) | UV-C radiation is not as dangerous as is UV-B radiation, so whether or not we are shielded from it does not matter. |
| | C) | UV-C radiation is extremely dangerous, but it is completely absorbed in the upper atmosphere by oxygen, O2, as well as ozone, O3. |
| | D) | There is no need. UV-C radiation is a natural part of the electromagnetic spectrum, so it only has the same potential for harm as visible light. |
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| 14 | |
HFCs are being developed to replace CFCs. Which of these compounds is a HFC? |
| | A) | CCl2F2 |
| | B) | CH3CFCl2 |
| | C) | CCl3CFCl2 |
| | D) | CF3CH2F |
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| 15 | |
Today's weather report indicates an UV Index of 3-5, the "moderate" exposure category. Which set of sun protection measures is most appropriate? |
| | A) | wear a hat and sunglasses |
| | B) | cover up, stay in the shade near midday, use sunscreen SPF 15+ |
| | C) | reduce time in the Sun between 10 AM and 4 PM, wear a hat and sunglasses, use sunscreen SPF 15+ |
| | D) | stay indoors to totally avoid the sun |
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| 16 | |
The fact that electrons in many molecules are arranged so that every atom shares in eight electrons is known as |
| | A) | quantized photons. |
| | B) | resonance forms. |
| | C) | Lewis structures. |
| | D) | the octet rule. |
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| 17 | |
The ozone hole is most prominent on Earth over which region? |
| | A) | North America |
| | B) | Europe |
| | C) | Antarctica |
| | D) | Africa |
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| 18 | |
CFCs rise into the stratosphere and |
| | A) | react directly with stratospheric ozone to destroy it. |
| | B) | become free radicals that destroy ozone. |
| | C) | react with other free radicals, removing CO2. |
| | D) | become free radicals that react with O2 to form O3. |
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| 19 | |
Consider this equation in which h and c are constants.
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This equation shows that the energy, E, of a single photon is |
| | A) | directly proportional to the frequency of radiation and directly proportional to its wavelength. |
| | B) | inversely proportional to the frequency of radiation and inversely proportional to its wavelength. |
| | C) | directly proportional to the frequency of radiation and inversely proportional to its wavelength. |
| | D) | inversely proportional to the frequency of radiation and directly proportional to its wavelength. |
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| 20 | |
For these three parts of the electromagnetic spectrum, which is the correct order of decreasing energy? |
| | A) | visible, ultraviolet, infrared |
| | B) | ultraviolet, visible, infrared |
| | C) | ultraviolet, infrared, visible |
| | D) | infrared, visible, ultraviolet |
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