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| 1 | |
How are MCLG (maximum contaminant level goal) and MCL (maximum contaminant level) values related for a carcinogenic drinking water pollutant such as benzene? |
| | A) | Both the MCLG and the MCL values must both be set to zero. |
| | B) | The MCL values are regularly lowered, making it impossible to identify any common relationship between the MCLG and MCL values. |
| | C) | The MCL value will be set to zero, but the MCLG value will take into account the technical and financial barriers to meeting health goals, so will typically be somewhat higher. |
| | D) | The MCLG value will be set to zero, but the MCL value will take into account the technical and financial barriers to meeting health goals, so will typically be somewhat higher. |
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| 2 | |
The gasoline additive MTBE has contaminated ground water in some areas. MTBE is _______________ and ______________.
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| | A) | a nonpolar substance, dissolves well in nonpolar soils where it can leach into the ground water. |
| | B) | is very volatile and escapes into the air when gasoline is pumped, can be washed into the soil by acid rain. |
| | C) | a polar substance, if oxygenated gasoline is leaks or spills the MTBE can dissolve into ground water. |
| | D) | not soluble in oxygenated gasolines, is emitted through the tailpipe without being combusted |
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| 3 | |
An aquifer is |
| | A) | a great pool of water trapped below the Earth's surface in sand and gravel. |
| | B) | the equipment used by municipal water treatment facilities to purify drinking water. |
| | C) | a collecting basin for recycled water that can be used only for irrigation. |
| | D) | a restricted area of surface water used as a resource for municipal drinking water. |
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| 4 | |
Of the salts sodium sulfate (Na2SO4), ammonium nitrate, (NH4NO3), aluminum hydroxide (Al(OH)3), and sodium chloride (NaCl), which are soluble in water? |
| | A) | Al(OH)3 only |
| | B) | Na2SO4, NH4NO3, and NaCl only |
| | C) | Na2SO4 and NaCl only |
| | D) | NH4NO3 and Al(OH)3 only |
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| 5 | |
Rank these covalent bonds in order of increasing polarity. |
| | A) | H—N < H—S < H—O |
| | B) | H—O < H—S < H—N |
| | C) | H—N < H—O < H—S |
| | D) | H—S < H—N < H—O |
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| 6 | |
When a 0.1 M solution of ethanol, C2H5OH, in water is tested for conductivity using the type of apparatus shown the light bulb will ______________; ethanol is _____________.
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| | A) | light up, not soluble in water. |
| | B) | not light up; in molecular form in aqueous solution. |
| | C) | shine dimly; only partially ionized in aqueous solution. |
| | D) | shine brightly, highly ionized in aqueous solution. |
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| 7 | |
When sodium nitrate, NaNO3, dissolves in water, |
| | A) | ions of Na+, N5+, and O2- are formed in the nonpolar solvent. |
| | B) | ions of Na+ and NO3- are formed in the polar solvent. |
| | C) | molecules of NaNO3 are dispersed in the nonpolar solvent. |
| | D) | molecules of NaNO3 are dispersed to the polar water molecules. |
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| 8 | |
This world map shows the availability of safe drinking water around the world. Which statement reflects the world population's access to safe drinking water?
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| | A) | The vast majority of the urban population of the world has access to safe drinking water. |
| | B) | Access to safe drinking water is no longer a concern in most parts of the world. |
| | C) | The urban population of South America and Africa has the greatest access to safe drinking water. |
| | D) | Access to safe drinking water is common in urban areas of North America and Europe. |
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| 9 | |
The correct formula and charge for the sulfite ion is _______. |
| | A) | SO4- |
| | B) | SO42- |
| | C) | SO3- |
| | D) | SO32- |
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| 10 | |
The figure below represents water molecules in a raindrop. Which describes the bonds A and B?
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232423/ch05_Image4.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"> (12.0K)</a>]]>
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| | A) | Bond A is a hydrogen bond, a type of intermolecular force. Bond B is a covalent bond, a type of intramolecular force. |
| | B) | Bond A is a covalent bond, a type of intermolecular force. Bond B is a "hydrogen bond," a type of intramolecular force. |
| | C) | Bond A is a hydrogen bond, a type of intramolecular force. Bond B is a covalent bond, a type of intermolecular force. |
| | D) | Bond A is a covalent bond, a type of intramolecular force. Bond B is a hydrogen bond, a type of intermolecular force. |
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| 11 | |
When NaCl dissolves in water the structure of the solution is best described as |
| | A) | NaCl molecules of surrounded by water molecules. |
| | B) | Na+ cations surrounded by the oxygen atoms of several water molecules, and Cl¯ anions surrounded by the hydrogen atoms of several water molecules. |
| | C) | Na+ cations surrounded by the hydrogen atoms of several water molecules, and Cl¯anions surrounded by the oxygen atoms of several water molecules. |
| | D) | Clusters of Na+ cations surrounding clusters of Cl- anions. |
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| 12 | |
A chloride ion contains _________ protons, ________ electrons, and has a net charge of ________. |
| | A) | 18, 11, 1+ |
| | B) | 17, 18, 1- |
| | C) | 16, 17, 1- |
| | D) | 17, 16, 1+ |
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| 13 | |
Ions of which atoms and molecules are responsible for hard water? |
| | A) | soap ions |
| | B) | NaCO3, borate, phosphate |
| | C) | Ca, Mg, Fe salts of bicarbonate and sulfate |
| | D) | All of these ions are responsible for a "hard" water designation |
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| 14 | |
Which water treatment method is widely used for disinfecting municipal water supplies, but is not commonly used for treating bottled water? |
| | A) | ultraviolet radiation |
| | B) | chlorination |
| | C) | ozonation |
| | D) | distillation |
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| 15 | |
The largest percent of the Earth's fresh water supply is found in |
| | A) | the oceans. |
| | B) | ground water. |
| | C) | the atmosphere as clouds. |
| | D) | ice caps, glaciers, and groundwater. |
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| 16 | |
How many moles of NaCl are there in 250 mL of a 1.20 M aqueous solution of NaCl? |
| | A) | 0.30 mol |
| | B) | 0.60 mol |
| | C) | 1.2 mol |
| | D) | 2.4 mol |
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| 17 | |
Which shows the correct Lewis structure and partial charges for a water molecule? |
| | A) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232423/ch05_Image5.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"> (3.0K)</a>]]>
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| | B) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232423/ch05_Image6.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"> (3.0K)</a>]]>
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| | C) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232423/ch05_Image7.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"> (3.0K)</a>]]>
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| | D) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073048763/232423/ch05_Image8.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"> (3.0K)</a>]]>
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| 18 | |
Based on the number of electron pairs around the central oxygen atom in a water molecule the predicted H-to-O-to-H bond angle is |
| | A) | 90o |
| | B) | 109.5o |
| | C) | 120o |
| | D) | 180o |
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| 19 | |
The primary reason for drinking water standards in the U.S. is to? |
| | A) | insure public access to potable water. |
| | B) | make water attractive and acceptable. |
| | C) | provide inexpensive bottled water. |
| | D) | make soft water available. |
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| 20 | |
The drawing shows two water molecules. The energy needed to break bond A is ____________ the energy needed to break bond B.
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| | A) | the same as |
| | B) | less than |
| | C) | greater than |
| | D) | cannot be compared with |
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