Question

In the chemical word equation- Zinc + Sulphuric acid giving Zinc sulphate + Hydrogen
State the reactants and products of the above reaction. What does the arrow indicate?
In the molecular equation:
${\text{Zn}} + {{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}} \to {\text{ZnS}}{{\text{O}}_4} + {{\text{H}}_2}\left[ {\text{g}} \right]$
State what $\left[ {\text{g}} \right]$ represents.

Answer 1

The chemical substances on the left side of the reaction are known as reactants and that on the right side are known as products. The physical state of the chemical substance is written in the bracket after its molecular formula.

Complete step by step answer:
We are given a chemical word equation as follows:
Zinc + Sulphuric acid giving Zinc sulphate + Hydrogen
The chemical formula for zinc is ${\text{Zn}}$. The chemical formula for the sulphuric acid is ${{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}$. The chemical formula for zinc sulphate is ${\text{ZnS}}{{\text{O}}_4}$. The chemical formula for hydrogen is ${{\text{H}}_2}$.
Thus, the chemical reaction is as follows:
${\text{Zn}} + {{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}} \to {\text{ZnS}}{{\text{O}}_4} + {{\text{H}}_2}$
The chemical substances on the left side of the reaction are known as reactants. Thus, the reactants are zinc $\left( {{\text{Zn}}} \right)$ and sulphuric acid $\left( {{{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}} \right)$.
The chemical substances on the right side of the reaction are known as products. Thus, the products are zinc sulphate $\left( {{\text{ZnS}}{{\text{O}}_4}} \right)$ and hydrogen $\left( {{{\text{H}}_2}} \right)$.
The direction of the arrow is from reactants to products. Thus, the arrow in the reaction indicates that the reactants are converted into products.
We are given a reaction as follows:
${\text{Zn}} + {{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}} \to {\text{ZnS}}{{\text{O}}_4} + {{\text{H}}_2}\left[ {\text{g}} \right]$
The physical state of the chemical substance is written in the bracket after its molecular formula.
Thus, $\left[ {\text{g}} \right]$ indicates that the physical state of ${{\text{H}}_2}$ in the reaction is gaseous.

Note:
We know that in the chemical equation, the physical state of the chemical substance is written in the bracket after its molecular formula. $\left[ {\text{s}} \right]$ indicates that the physical state of the chemical substance is solid. $\left[ {\text{l}} \right]$ indicates that the physical state of the chemical substance is liquid. $\left[ {{\text{aq}}} \right]$ indicates that the physical state of the chemical substance is aqueous.