Distinguish extra particle energy from a lower activation energy.
| English | Chinese |
|---|---|
| kinetic energy | 动能 |
| activation energy | 活化能 |
| catalyst | 催化剂 |
| enzyme | 酶 |
Try each question before opening its hint or answer. Use paper for calculations and diagrams.
Why can an enzyme-catalysed reaction become slower at very high temperature?
Decide whether the change affects particle energy or the activation barrier.
The enzyme can denature, changing its shape and reducing its catalytic activity.
Explain why a higher temperature increases reaction rate using energy and collisions.
Explain both collision frequency and the fraction with enough energy.
Particles have higher average kinetic energy. Collisions are more frequent and a greater fraction meet Eₐ.
A student says a catalyst makes particles move faster. Correct the explanation.
A catalyst changes the pathway, not the temperature.
At constant temperature, the catalyst lowers Eₐ; it does not increase average particle kinetic energy.
Use Lesson 3 in your worksheet for written practice. Your teacher will discuss those answers in class.