What is the difference between exothermic and endothermic reaction?

Translate the following statement into chemical equation and balance it.

Calcium oxide reacts with water to give calcium hydroxide.

Translate the following statement into chemical equation and balance it.

Hydrogen gas combines with nitrogen to give ammonia.

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.

Name the substance oxidised, reduced, oxidising agent, reducing agent in the following reaction:

$2{\mathrm{H}}_2\mathrm{S}\left(\mathrm{g}\right)+{\mathrm{SO}}_2\left(\mathrm{g}\right)\to 3\mathrm{S}\left(\mathrm{s}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

Name the substance oxidised, reduced, oxidising agent, reducing agent in the following reaction:

$2\mathrm{Al}\left(\mathrm{s}\right)+3\mathrm{HCl}\left(\mathrm{aq}\right)\to 2{\mathrm{AlCl}}_3\left(\mathrm{aq}\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right)$