Question

16. A chemical reaction represented by using symbols of the elements.

• A. Chemical equation
• B. Word equation
• C. Chemical formula
• D. Chemical symbol

Answer 1

The correct option is A

Chemical equation

Explanation for correct option:

(A) A symbolic representation of the changes which occur in a chemical reaction, expressed in terms of the formulae of the molecules involved, is called a chemical equation. For example,

The balanced chemical equation of water is:

$\underset{\mathrm{Hydrogen}\mathrm{Oxygen}\mathrm{Water}}{2{\mathrm{H}}_2+{\mathrm{O}}_2\to 2{\mathrm{H}}_2\mathrm{O}}$

Explanation for incorrect options:

(B) A word equation gives the names of the substance involved in a reaction. For example:

$\mathrm{Hydrogen}+\mathrm{Oxygen}\to \mathrm{Water}$

This would represent a word equation.

• Hydrogen and Oxygen are the reactants as they are on the left-hand side of the arrow, and water is the product as it is on the right-hand side of the arrow.

(C) A set of chemical symbols showing the elements present in a compound and their relative properties is called a chemical formula. For example, the chemical formula for water is$\left({\mathrm{H}}_2\mathrm{O}\right)$.

(D) The letters used to represent elements are called chemical symbols. For example, the symbol of Boron is $\mathrm{B}$.

So the correct answer is an option (A).