A Level Chemistry 9701/23/M/J/20 Q1

Question

1 (a) A sample of barium is heated in oxygen.
(i) Describe two observations for this reaction.
(ii) Write an equation for this reaction. Include state symbols.
(b) Calcium carbonate can be converted into calcium hydroxide in a two-step process.
(i) Describe how the two-step process is carried out to convert calcium carbonate into calcium hydroxide. Include relevant equations.
(ii) Name the type of reaction occurring when calcium carbonate is converted into
calcium oxide
(iii) State one common use for both calcium carbonate and calcium hydroxide.
(c) Gallium is a silver-grey solid. Aluminium and gallium share many similar chemical properties.
(i) Construct an equation for the reaction of gallium when heated in oxygen to form gallium oxide, Ga2O3.
(ii) Deduce the oxidation number of gallium in Ga2O
(iii) 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.

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    2021-03-27T17:07:17+08:00

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