UTF-8Chemical Reactions: Catalysis227223152
Reaction Rates, Catalysis, and Energy: Catalysis.
Below is a model containing reactants which will form the reaction: A2 + B2 --> 2 AB. In this case the model has been set so the activation energy is high. Try running the reaction with and without a catalyst to see the effect catalysts have on chemical reactions.
EXPERIMENTING WITH THE MODEL
1. Run the model to observe what happens without a catalyst.
2. Pause the model.
3. Add a few (3 - 4) catalyst atoms to the container by pressing the button and then clicking inside the model container.
4. Run the model again, and observe how the catalyst affects the reaction.
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">It turns out
that <strong>almost all of the reactions we need to keep us alive would
not happen fast enough at body temperature</strong>, because the
activation energy is too high. However, nature has found a way around this
problem - catalysts. <strong>Catalysts help a reaction to happen faster.</strong><br><br>Our
own body makes some catalysts called enzymes, which are just proteins that
help reactions happen faster. Some diseases are caused by the inability of
a person's body to make the right enzyme (<em>i.e.</em> catalyst) for an
important reaction. <a href="http://www.ygyh.org/pku/cause.htm">Phenylketonuria</a>
is one of those diseases.</font>
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<font size="4" face="Times,serif"><strong>Describe your observations of how a catalyst participates in the reaction. Why does the the formation of A-B only happen when the catalyst is added?</strong></font>
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<font size="4" face="Times,serif"><strong>If you could adjust the bond strengths of A-A, or B-B, how would you change them to speed up the reaction?</strong></font>
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<font size="4" face="Times,serif"><strong>It is often said that catalysts work by lowering the activation energy (energy needed to get a reaction started). What do you see that seems to support that idea?</strong></font>
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