NCERT grade 10 Science Chapter 1: Chemical Reactions and Equations – Concepts and explanation: Part 2

 Writing a Chemical Equation

A chemical equation represents a chemical reaction. Word equations are a quick and simple way of summarising chemical reactions. For example, let’s consider the following description of this reaction: “Calcium carbonate powder reacts with a solution of dilute hydrochloric acid yields calcium chloride, liquid water and carbon dioxide gas.” This can be shown by the following word equation:

Calcium carbonate + hydrochloric acid → calcium chloride + water + carbon dioxide

 Another shorter way for representing chemical equations is to use chemical formulae instead of words. If you recall formulae of Calcium carbonate, hydrochloric acid, calcium chloride, water and carbon dioxide gas, the above word-equation can be written as


Balanced Chemical Equations

The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction which means the total mass of the elements present in the products of a chemical reaction must to be equal to the total mass of the elements present in the reactants. In other words, the number of atoms of each element remains the same, before and after a chemical reaction. Hence, we need to balance a skeletal chemical equation.

Example:

The above mentioned chemical Eq. (1) is not balanced and the balanced equation can be written as follows:


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