What information does the following chemical equation convey?
$Zn + H_{2} {SO}_{4} \to {ZnSO}_{4} + H_{2}$

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Solution

Reactants Reactants Products Products

Chemical formula Zinc(Zn) Sulphuric acid ( $H_{2} {SO}_{4}$ ) Zinc sulphate ( ${ZnSO}_{4}$ ) Hydrogen ( $H_{2}$ )

Number of Molecules 1 1 1 1

Molar Mass 65 2(1)+32+4(16)=98 65+32+4(16) = 161 2(1)=2

Mass 665 g 98 g 161 g 2 g

Zinc and sulphuric acid are the reactants while zinc sulphate and hydrogen are the products of the reaction. [1 Marks]

1 molecule of zinc reacts with 1 molecule of sulphuric acid to form 1 molecule of zinc sulphate and 1 molecule of hydrogen gas. [1 Marks]

65 g of zinc reacts with 98 g of sulphuric acid to form 161 g of zinc sulphate and 2 g of hydrogen gas. [1 Marks]

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What information does a balanced equation convey?

Z n + H_{2} S O_{4} \to Z n S O_{4} + H_{2}

What information does the following chemical equations convey ?

(a) $Z n$ + $H_{2} S O_{4}$ $\to$ $Z n S O_{4}$ + $H_{2}$

(b) $M g$ + $2 H C l$ $\to$ $M g C l_{2}$ + $H_{2}$

Z n (s) + 2 H C l (a q) \to Z n C l_{2} (a q) + H_{2} ↑

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