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Chemical Reactions and Stoichiometry: Summary questions.
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Chemical Reactions and Stoichiometry:</strong> Summary questions.</font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">You should now understand basic chemical equations, what they represent, and how heat and concentration affect reaction rates. Please answer the questions below to summarize what you have learned.</font></td>
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<strong><font face="Arial, Helvetica, sans-serif" size="4">1) The process
by which food rots is ultimately driven by chemical reactions. Why does
refrigerating food make the food last longer? (Be sure to explain it at
the molecular level.)</font></strong>
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<strong><font face="Arial, Helvetica, sans-serif" size="4">2) Which
chemical equation below is shorthand for the following description? One
molecule of methane (CH<sub>4</sub>) reacts with two molecules of oxygen (O<sub>2</sub>)
to form one molecule of carbon dioxide (CO<sub>2</sub>) and two molecules
of water (H<sub>2</sub>O):</font></strong>
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<html>CH<sub>4</sub> + O<sub>2</sub> --> CO<sub>2</sub> + H<sub>2</sub>O</html>
<html>2CH<sub>4</sub> + 4O<sub>2</sub> --> 2CO<sub>2</sub> + 4H<sub>2</sub>O</html>
<html>CH<sub>4</sub> + 2O<sub>2</sub> --> CO<sub>2</sub> + 2H<sub>2</sub>O</html>
<html>CH<sub>4</sub> + 2O<sub>2</sub> --> 2CO<sub>2</sub> + 2H<sub>2</sub>O</html>
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<strong><font face="Arial, Helvetica, sans-serif" size="4">3) Aluminum
reacts with oxygen to form aluminum oxide, a thin non-reactive coating
that prevents aluminum from further rusting. The UNBALANCED chemical
equation is: Al + O<sub>2</sub><img src="reactionRight.png"> Al<sub>2</sub>O<sub>3</sub>.
What is the correct BALANCED chemical equation?</font></strong>
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<html>8 Al + 6 O<sub>2</sub> --> 4 Al<sub>2</sub>O<sub>3</sub></html>
<html>2 Al + 3 O<sub>2</sub> --> Al<sub>2</sub>O<sub>3</sub></html>
<html>4 Al + 3 O<sub>2</sub> --> 2 Al<sub>2</sub>O<sub>3</sub></html>
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<strong><font face="Arial, Helvetica, sans-serif" size="4">4) Some dry
powder fire extinguishers contain baking soda, and use the following
reaction to produce carbon dioxide (CO<sub>2</sub>) which helps to smother
the fire: 2 NaHCO<sub>3</sub><img src="reactionRight.png"> Na<sub>2</sub>CO<sub>3</sub>
+ H<sub>2</sub>O + CO<sub>2</sub>. What type of reaction is this?</font></strong>
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