Factors affecting enzyme action

these questions are from the "check yourself" AQA revision book. these were the points i personally was struggling with. (along with bulllet point answers)

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Enzymes

Q: Why does an increase in temperature increase the rate of reaction?

  • Enzymes work more effectively

  • Molecules move faster - so have more collisions

  • Colliding with more force
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Enzymes

Q: Why do enzymes stop working if the temperature is too hot?

  • Their shape changes - they denature

  • The reacting molecules will not fit into the active site
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Enzymes

Q: Why does the pH have to be 'right' for the reaction to go well?

  • Enzymes work best in a narrow pH range

  • If it varies too much then they might denature
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