Chemistry 9701 · AS & A Level · Group 2

Group 2 — practice question

A barium sample is heated in oxygen.
(a(i))[2]

Describe two observations you would make for this reaction.

(a(ii))[1]

Write an equation for this reaction, including state symbols.

(b(i))[3]

Describe how the two-step process is used to change calcium carbonate into calcium hydroxide. Include the relevant equations.

(b(ii))[1]

Name the type of reaction occurring when calcium carbonate is converted into calcium oxide.

(b(iii))[1]

State one shared use of calcium carbonate and calcium hydroxide.

(c(i))[1]

Construct an equation for the reaction when gallium is heated in oxygen to form gallium oxide, $\text{Ga}_2\text{O}_3$.

(c(ii))[1]

Deduce the oxidation number of gallium in $\text{Ga}_2\text{O}_3$.

(c(iii))[2]

Complete the table by predicting the formula of each gallium-containing product formed when gallium oxide reacts separately with hot aqueous hydrochloric acid and with hot concentrated sodium hydroxide.

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: Green flame / white flame (with a green tinge)

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