Changes

: [[Copper Sulphate ]] + [[Magnesium ]] → [[Magnesium Sulphate ]] + [[Copper]]: [[Iron Chloride ]] + [[Calcium ]] → [[Calcium Chloride ]] + [[Iron]]: [[Lithium Hydroxide ]] + [[Potassium ]] → [[Potassium Hydroxide ]] + [[Lithium]]: [[Iron Oxide ]] + [[Aluminium ]] → [[Aluminium Oxide ]] + [[Iron]]