Enzyme Races!
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HS-PS1-5: Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.
(Evidence Statements)
Part I - Effect of Temperature on Reaction Rate
Part II - Effect of Concentration on Reaction Rate
(Evidence Statements)
Part I - Effect of Temperature on Reaction Rate
- Run a trial to test the effect of temperature on the speed of a chemical reaction.
- Set the simulation window on the left to Enzymes-5, Substrates-50, Inhibitors=0, Temperature=5 Container=400 and pH=7. Now click on the "setup" button.
- Now set the simulation window on the right to the same settings but changing just one variable. For example, you might try Enzymes-5, Substrates-50, Inhibitors=0, Temperature=25, Container=400 and pH=7. Now click on the "setup" button.
- Click on start for the two windows as quickly as you can to avoid one simulation window having a big head start.
- Compare the time it takes for blue dots (starting materials or "reactants") to be converted to red dots (ending materials or "products").
- Propose an explanation for why the window with the faster reaction takes less time for reactants (blue) to turn into products (red).
Part II - Effect of Concentration on Reaction Rate
- Try running with the set up described below to determine the reason why concentration changes the rate of a reaction.
- Set the simulation window on the left to Enzymes-5, Substrates-50, Inhibitors=0, Temperature=15 Container=400 and pH=7. Now click on the "setup" button.
- Now set the simulation window on the right to Enzymes-15, Substrates-50, Inhibitors=0, Temperature=15, Container=400 and pH=7. Now click on the "setup" button.
- Click on start for the two windows as quickly as you can to avoid one simulation window having a big head start.
- Compare the time it takes for blue dots (starting materials or "reactants") to be converted to red dots (ending materials or "products").
- Propose an explanation for why the window with the faster reaction takes less time for reactants (blue) to turn into products (red).