General Instructions: answer the following questions using the narration and the video scenes as a guide.

1. When molecules meet or collide, what two things may happen?





2. When colliding molecules, such as a hydrogen molecule, H_2, and bromine atom, Br, have enough kinetic energy to cause a reaction, what three or four general steps occur?







3. Why does a mixture of hydrogen and oxygen (H₂ + O₂) require additional energy to react?



4. In Figure 13.21 of your text is an energy or reaction “profile”. Describe or illustrate the significance of each part of this diagram.

5. Explain how collision theory and the concept of activation energy explains the effect of temperature on reaction rates.







6. What is a catalyst? How does it work?

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