| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.sl.TZ1.18 |
| Level | SL | Paper | 1 | Time zone | TZ1 |
| Command term | Identify | Question number | 18 | Adapted from | N/A |
Question
What is the best definition of rate of reaction?
A. The time it takes to use up all the reactants
B. The rate at which all the reactants are used up
C. The time it takes for one of the reactants to be used up
D. The increase in concentration of a product per unit time
Markscheme
D
Examiners report
[N/A]
Syllabus sections
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