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

Reactions in Everyday Life

Chemical reactions take place around us in many everyday situations. A flaky brown-coloured layer appearing on the surface of iron articles such as nail, crackers that render bright light and sound during festive season, digestion of food, milk left at room temperature during summers, Cooking of food and respiration are some examples for reactions happened in day-to-day life. In all the above situations, the nature and the identity of the initial substance have changed. So, in a chemical reaction, at least one of the following changes will occur:

Change in state

Change in colour

Evolution of a gas

Change in temperature

Formation of a precipitate

 What is a Chemical Reaction?

A chemical reaction is a process in which the chemical structure of a substance changes, leading to the formation of a new substance with different properties. In other words, the reactants convert into products through the breaking and formation of chemical bonds.

 What is a Chemical Equation?

A chemical equation is the symbolic representation of a chemical reaction in the form of chemical formulae, signs, symbols, and directions, in which the reactant entities are given on the left-hand side and the product entities on the right-hand side.

Example: when a magnesium ribbon is burnt in oxygen, it gets converted to magnesium oxide. The word-equation for this reaction can be written as follows:



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