Give one reason why magnetising a piece of steel is a physical change.

Complete the following equation in words and then write down the balanced equation.

Zinc nitrate $+$ Sodium carbonate $\to$?

Complete the following equations in words and then write down the balanced equation in each case.

Iron (II) sulphate(ferrous sulphate) $+$ Sodium hydroxide $\to$?

State whether the following conversion is an examples of oxidation or reduction:

$\mathrm{Na}\to {\mathrm{Na}}^{+}$

State whether the following conversions are examples of oxidation or reduction:

${\mathrm{PbO}}_2\to {\mathrm{PbSO}}_4$

Complete the following equations and state in each if the reaction represents oxidation or reduction:

${\mathrm{Fe}}^{2+}\to {\mathrm{Fe}}^{3+}$

Complete the following equations and state in each if the reaction represents oxidation or reduction:

$\mathrm{Cl}\to$

Complete the following equations and state in each if the reaction represents oxidation or reduction:

$\mathrm{Ag}\to {\mathrm{Ag}}^{+}$

Complete the following reaction and state whether the following reaction represents oxidation or reduction:

${\mathrm{Cu}}^{++}\to \mathrm{Cu}$