Katie Whitmore 10H
Year 10 coursework
Investigate how concentration affects the rate of reaction
What is meant by rate of reaction?
Chemical reactions can take place at different speeds. An explosion, such as the reaction of hydrogen and oxygen together to produce water vapour, is a very fast reaction – it is over in a tiny fraction of a second. The rusting of iron and the souring of milk are very slow reactions.
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Peer Reviews
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Quality of writing
Communicates in a clear and simplistic way so the writing is easy to understand. Grammar, punctuation and spelling are all correct.
Level of analysis
The rate of reaction is explained well and clearly for this level of student, but to gain higher marks the student could have researched the theoretical actual chemical definition of rate and what this means. In the cases of where the student mentions that doubling the rate of reaction doubles the rate of reaction, the student should give examples of where this is the instance, and then again when they say this is not sometimes the case. The student chooses a poor method to assess the rate of reaction. Measuring how 'cloudy' the experiment is means that the margin for error is great as this will vary from person to person.
Response to question
Uses different text sizes in the experiment which should be made uniform as this looks untidy. Uses the concept of a 'fair' experiment which is very basic terminology. The student overall presents a simplistic style essay which is accurate but basic in understanding. The results are not included in this essay, neither is an assessment of the results. The student should use solid scientific evidence to make a prediction.
