| Date | November 2009 | Marks available | 1 | Reference code | 09N.1.hl.TZ0.21 |
| Level | HL | Paper | 1 | Time zone | TZ0 |
| Command term | State | Question number | 21 | Adapted from | N/A |
Question
The activation energy of a reaction may be determined by studying the effect of a particular variable on the reaction rate. Which variable must be changed?
A. pH
B. Concentration
C. Surface area
D. Temperature
Markscheme
D
Examiners report
[N/A]
