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Chemical Reactions and Stoichiometry: What is a chemical reaction?
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Chemical Reactions and Stoichiometry:</strong> What is a chemical reaction?</font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Chemical reactions are going on everywhere, from deep in the sea to high in the atmosphere. One of the most active places for chemistry, however, is inside a living organism. Right now countless chemical reactions are happening inside of you. What is a chemical reaction? Use the model below to explore the answer to this question at the atomic level. </font></td>
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<p>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">A chemical
reaction can occur in three different ways:</font>
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<ul>
<li>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">A chemical
bond is formed.</font>
</li>
<li>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">A chemical
bond is broken.</font>
</li>
<li>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">One or
more electrons are transferred between atoms or molecules. </font>
</li>
</ul>
<p>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">This
activity will allow you to explore reactions in which chemical bonds are
formed and broken. In the model to the left you can see both bond
formation and bond breaking. <strong>Run the model </strong></font><strong><img src="play.gif"><font size="4" face="Verdana, Arial, Helvetica, sans-serif">,
and try heating and cooling the chemicals to see how this affects the
kind of reaction that may occur.</font></strong>
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<p>
<input value="heat" script="script:mw:1:select atom all; heat 0.1; select atom none;" name="Submit" type="submit">
  <input value="cool" script="script:mw:1:select atom all; heat -0.1; select atom none;" name="Submit2" type="submit">
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<strong><font size="4" face="Arial, Helvetica, sans-serif">When does a
chemical reaction occur?</font></strong><font size="4" face="Arial, Helvetica, sans-serif">
(Note: You can reset the model </font><img src="reset.gif"><font size="4" face="Arial, Helvetica, sans-serif"> or
even play it backwards </font><img src="playBackwards.gif"><font size="4" face="Times,serif">.)
</font>
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Any two atoms can form a bond at any time.
When two unbonded atoms collide with each other.
When any two atoms hit each other even if they have already formed bonds to other atoms.
Sometimes, when bonded atoms collide with something else, the bond breaks.
Both B and D are correct.
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