When heated, both calcium carbonate, $\text{CaCO}_3$, and barium carbonate, $\text{BaCO}_3$, decompose to give the metal oxide and a gas.
(a)[1]
Write the equation for the thermal decomposition of $\text{CaCO}_3$.
(b)[2]
State which of $\text{CaCO}_3$ and $\text{BaCO}_3$ breaks down at the lower temperature. Explain your answer.
(c(i))[1]
Calcium oxide, $\text{CaO}$, reacts with water to produce compound $A$. Identify $A$.
(c(ii))[3]
Barium oxide, $\text{BaO}$, reacts with water to produce compound $B$. Explain why $A$ is less soluble than $B$.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$” …