Chemistry 0620 · IGCSE · Preparation of salts

Preparation of salts — practice question

This question concerns copper and its compounds.
(a)[3]

Describe the bonding present in a metallic element such as copper. A diagram may be included in your response.

(b)[3]

State what is used for the positive electrode (anode), the negative electrode (cathode) and the electrolyte.

(c)[3]

Calculate the greatest mass of copper(II) sulfate crystals, CuSO$_4\cdot$5H$_2$O, that may be formed using the following steps.

(d)[1]

State one observation showing that the copper(II) oxide is in excess in step 1.

(e)[3]

Give a reason for the decrease in rate of reaction. Explain your answer in particle terms.

(f)[1]

Name a substance, other than copper(II) oxide, that may be added to dilute sulfuric acid to make copper(II) sulfate in step 1.

(g)[1]

Name the process used to separate excess copper(II) oxide from aqueous copper(II) sulfate in step 2.

(h)[2]

Suggest the meaning of the term saturated solution in step 3.

(i)[1]

Explain why aqueous copper(II) sulfate is not taken to dryness in step 3.

Worked solution & mark scheme

This 18-mark question has a full step-by-step worked solution and mark scheme. One marking point: regular lattice of positive ions

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