Chemistry 5070 · O Level · Experimental design

Experimental design — practice question

A student is using the apparatus shown below to oxidise copper.
(a)[1]

Construct an equation to show the reaction of copper with oxygen.

(b)[1]

Name the main component of the gas that remains in D at the end of the experiment.

(c(i))[3]

Plot the results and draw a straight line of best fit.

(c(ii))[1]

Ring the anomalous point.

(c(iii))[1]

Use your graph to deduce the correct final volume of gas for the anomalous point.

(c(iv))[1]

Suggest a reason for the anomalous result.

(d(i))[1]

What is the final volume of gas if the student uses $25.0\,\text{cm}^3$ as the initial volume of air?

(d(ii))[1]

If the final volume of gas is $35.0\,\text{cm}^3$, what original volume of air does the student use?

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: Balanced equation: 2Cu + O2 → 2CuO

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