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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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Which of the following affect the rate of reaction?
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concentration of reactants
temperature of reactants
boiling point of reactants
both A and B
none of the above
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Explain your answer for the previous question about factors affecting
reaction rates:
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>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.)</strong></font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>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):</strong></font>
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<html>CH<sub>4</sub> + O<sub>2</sub> --> CO<sub>2</sub> + H<sub>2</sub>O</html>
<html>2 CH<sub>4</sub> + 4 O<sub>2</sub> --> 2 CO<sub>2</sub> + 4 H<sub>2</sub>O</html>
<html>CH<sub>4</sub> + 2 O<sub>2</sub> --> CO<sub>2</sub> + 2 H<sub>2</sub>O</html>
<html>CH<sub>4</sub> + 2 O<sub>2</sub> --> 2 CO<sub>2</sub> + 2 H<sub>2</sub>O</html>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>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?</strong></font>
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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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<font face="Arial, Helvetica, sans-serif" size="4"><strong>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?</strong></font>
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synthesis
decomposition
single displacement
double displacement
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<p class="firstp" align="center"><strong>You have reached the end of the activity.<BR>Please submit a report.</strong></p>
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Chemical Reactions and Stoichiometry
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