Magnesium carbonate is added to dilute hydrochloric acid. $\text{MgCO}_3 + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{CO}_2 + \text{H}_2\text{O}$ If $25.0\,\text{cm}^3$ of dilute hydrochloric acid is mixed with excess magnesium carbonate, the carbon dioxide obtained at room temperature and pressure has a volume of $120\,\text{cm}^3$. Calculate the concentration, in $\text{mol dm}^{-3}$, of the dilute hydrochloric acid.
The reaction is carried out again at a higher temperature, while every other condition remains unchanged. Describe how the rate of reaction changes. Explain your answer using ideas about collisions between particles.
The reaction is carried out again with hydrochloric acid at a higher concentration, while every other condition remains unchanged. Describe how the rate of reaction changes. Explain your answer using ideas about collisions between particles.
Duralumin is an alloy made from aluminium, magnesium, copper and manganese. State the meaning of the term alloy.
Copper is purified through electrolysis with an impure copper anode and a pure copper cathode. Write the ionic equation for the change occurring at the cathode.
A metal object may be coated by electroplating it with another metal. State one use of electroplating.