1. Explain all of the effects of the factor that you tested
For example, temperature increases both the frequency of collisions and the fraction which are successful
C  C+

2. Use more key terms in your discussion of collision theory
C+  B

3. Explain why the factor you tested increases the rate
Make your discussion of collision theory more thorough
B  A

4. Include values for rate in your discussion
Include a discussion of collision theory (a successful collision must have proper geometry and enough energy to overcome the activation energy)
Include values for rate in your discussion
A  A+

5. Include diagrams to support your discussion of collision theory
A+  A++