1) A student decided to investigate the effect of temperature on the rate of the following reaction.

Part of the student’s experimental report is provided on the right.

a. What does the student need to do to ensure that they comply with all applicable safety guidelines during the investigation?

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b. What is the independent variable?

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c. What is the dependent variable and how is it measured?

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d. i. Predict the relationship between the independent variable and the dependent variable. Explain your prediction.

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ii. Is the graph of the student’s results consistent with your prediction? Give your reasoning.

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e. Identify two ways in which the graph could have been presented differently to better illustrate the relationship between the independent variable and the dependent variable.

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f. Identify two changes that could be made to the experimental method to improve the precision of the results if the experiment was repeated. For each change, explain how it would improve precision.

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2. Using large sample sizes in an experiment increases
A. reliability.
B. precision.
C. validity.
D. uncertainty.

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