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CIE iGCSE Co-Ordinated Science C9.4 Reactivity series Exam Style Questions Paper 3

CIE iGCSE Co-Ordinated Science C9.4 Reactivity series Exam Style Questions Paper 3

Question

(a) A student adds calcium and copper to separate test-tubes of cold water. Describe the reaction, if any, for each metal.

▶️Answer/Explanation

Calcium: Gas evolved / metal dissolves / white insoluble solid forms.

Copper: No change.

(b) The student reacts copper carbonate with dilute sulfuric acid. Copper(II) sulfate, carbon dioxide and water are made.

(i) Complete the word equation for this reaction.

▶️Answer/Explanation

Copper carbonate + sulfuric acid → copper sulfate + carbon dioxide + water.

(ii) Carbon dioxide gas is a greenhouse gas. State the name of one other greenhouse gas.

▶️Answer/Explanation

Methane.

(iii) The formula of copper(II) sulfate is CuSO4. State the number of different elements and the total number of atoms shown in this formula.

▶️Answer/Explanation

Number of elements: 3 (Copper, Sulfur, Oxygen).

Number of atoms: 6 (1 Cu, 1 S, 4 O).

(c) Copper oxide, CuO, is reduced to copper, Cu, by heating with carbon. The equation for the reaction is shown.

2CuO + C → 2Cu + CO2

(i) Explain how the equation shows that copper oxide, CuO, is reduced.

▶️Answer/Explanation

Copper oxide loses oxygen, which is the definition of reduction.

(ii) The reaction between copper oxide and carbon is exothermic. State what is meant by exothermic.

▶️Answer/Explanation

Exothermic reactions release energy to the surroundings, usually in the form of heat.

(iii) Name a metal, other than copper, that can be extracted from its ore by heating with carbon.

▶️Answer/Explanation

Iron.

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