Chemistry 0620 · IGCSE · Rate of reaction

Rate of reaction — practice question

A student examines how quickly large pieces of magnesium carbonate react with an excess of dilute nitric acid. $\text{MgCO}_3 + 2\text{HNO}_3 \rightarrow \text{Mg(NO}_3)_2 + \text{CO}_2 + \text{H}_2\text{O}$
(a)[1]

Name the salt that is produced when magnesium carbonate reacts with dilute nitric acid.

(b(i))[1]

At what time did the reaction end?

(b(ii))[1]

Using the graph, deduce how much carbon dioxide was produced in the first 50 seconds of the experiment.

(b(iii))[2]

Sketch a line on the grid for the investigation using smaller pieces of magnesium carbonate.

(b(iv))[1]

How does increasing the temperature change the rate of this reaction? All other conditions are kept the same.

(b(v))[1]

How does decreasing the concentration of nitric acid change the rate of this reaction? All other conditions are kept the same.

(c)[3]

Complete these sentences about the test for nitrate ions using words from the list. aluminium ammonia blue chloride copper green iron nitrate oxygen red Aqueous sodium hydroxide and ............... foil are added to the solution to be tested. The mixture is warmed gently. The ............... formed turns damp ............... litmus paper ............... .

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: magnesium nitrate salt

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