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Chemical Reactions: Introduction
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Reaction Rates, Catalysis, and Energy: Introduction
this is a test2
WHAT IS A CHEMICAL REACTION?
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<font size="4" face="Verdana,sans-serif">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. Each
of your cells is like a test tube that is part of a lab experiment. The
bunsen burner is heated by a flame. We, however, use food (and ultimately
ATP generated from the chemical energy in food) for fuel instead of the
methane burning in the Bunsen flame.</font>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">A chemical
reaction can occur in three different ways:</font>
<ul>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">A chemical
bond is formed.</font>
</li>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">A chemical
bond is broken.</font>
</li>
<li>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">One or
more electrons are transferred between atoms or molecules. </font>
</li>
</ul>
<p>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">This
activity will allow you to explore reactions in which chemical bonds are
formed and broken. In the model to the left you can cause a reaction of
the first kind to occur, one in which chemical bonds are formed. You may
also occasionally see a reaction occur where chemical bonds break. Run
the model by pressing the play button </font><img src="play.gif"><font size="4" face="Verdana, Arial, Helvetica, sans-serif">,
and answer the question below.</font>
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<font size="4" face="Times,serif"><strong>When does a chemical reaction
occur?</strong> (Note: You can reset the model </font><img src="reset.gif"><font size="4" face="Times,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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