When heated, both calcium carbonate, $\text{CaCO}_3$, and barium carbonate, $\text{BaCO}_3$, break down to produce a metal oxide and a gas.
(a)[1]
Write an equation to show the thermal decomposition of $\text{CaCO}_3$.
(b)[2]
State which one of $\text{CaCO}_3$ and $\text{BaCO}_3$ decomposes at a lower temperature. Explain your answer.
(c(i))[1]
Calcium oxide, $\text{CaO}$, reacts with water to produce compound A. Barium oxide, $\text{BaO}$, reacts with water to produce compound B. Identify A.
(c(ii))[3]
Explain why A has a lower solubility than B.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Balanced equation: $\mathrm{CaCO_3 \rightarrow CaO + CO_2}$” …