Revision Exercise

Translate the following into the language of chemistry: 

Sulphur dioxide reacts with oxygen at $450°\mathrm{C}$in the presence of a catalyst $\left({\mathrm{V}}_2{\mathrm{O}}_5\right)$to form sulphur trioxide. The reaction is reversible and $182\mathrm{kJ}$of energy is liberated.

Correct the equation and then balance it:

$$\begin{gathered} \mathrm{Ca} +{\mathrm{H}}_2\mathrm{O} \to \mathrm{CaOH} +{\mathrm{H}}_2 \\ {\mathrm{N}}_{2 } +\mathrm{H} \to {\mathrm{NH}}_3 \end{gathered}$$

Ethane $\left({\mathrm{C}}_2{\mathrm{H}}_6\right)$burns in oxygen to form carbon dioxide and water. Write a balanced chemical equation for this.

Identify the substance oxidised and oxidising agent in the following reaction:

${\mathrm{H}}_2\mathrm{S} + {\mathrm{Cl}}_2 \to \mathrm{S} +2\mathrm{HCl}$

Predict the oxidising agent and reducing agent in the following reaction:

$\mathrm{PbS}\left(\mathrm{s}\right) +4{\mathrm{H}}_2{\mathrm{O}}_2\left(\mathrm{aq}\right) \to {\mathrm{PbSO}}_4\left(\mathrm{s}\right) +4{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

Translate the following statement into chemical equation and balance it.

Sodium metal reacts with water to give sodium hydroxide and hydrogen gas.

Translate the following statement into chemical equation and balance it.

Barium chloride reacts with sodium sulphate to give barium sulphate and sodium chloride.

Translate the following statement into chemical equation and balance it.

Magnesium nitride reacts with water to give magnesium hydroxide and ammonia.