A reaction in the body has an activation energy of 85 kJ/mol without a catalyst…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A reaction in the body has an activation energy of without a catalyst. With its enzyme, the activation energy is . The temperature is , and the frequency factor is the same in both cases. Take . Find the natural logarithm of the ratio of the rate constants, and the ratio as a power of ten.
Need a reminder? The key ideaShow
An enzyme lowers the activation energy . With the same frequency factor, with . Between two temperatures, . A denatured enzyme has lost its activity.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Plan. The ratio is .
Step 1. Difference. .
Step 2. Natural logarithm. .
Step 3. Power of ten. , so the ratio is about , which is .
Answer: , and the enzyme makes the reaction about times faster.
Check. A drop of about gives one power of ten at this temperature, and .
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