Chemistry key areas:

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General knowledge:

Comparing to experiments:
When comparing to experiments, you always need to ask yourself a few things:
1: how has the data been found, and how accurate is said data?
2: which experiment had the fastest/slowest rate and why is this?
3: what is the question SPECIFICALLY asking for? A comparison in data? A comparison of reliability? A comparison on equipment used?

If you are able to answer all these questions then you will be fine for this type of question. If you can't, here are some helpful tips:
Data can be called reliable when it has a pattern to it. You should be naturally recording the data as you go along.
Remember, the rate of an experiment can be found using…

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very short, would have liked more information as a pupil to note down and have an understand of each.