Chapter 3: Physical and Chemical Changes

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Physical and Chemical Changes


When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.


Neutralisation Reaction: It is the reaction of an acid and a base to give salt and water with the evolution of heat. Thus, a new substance is formed called salt.

Acid + Base →Salt + Water

Lemon contains citric acid while baking soda is a base. When lemon juice is added to baking soda, the acid reacts with the base to form along with the evolution of carbon dioxide gas. 

Lemon(citric acid)+Baking soda
ightarrow Salt+Carbon dioxide+Water

Here, the chemical composition of both lemon juice and baking soda changes that leads to the formation of new substance. Hence, it is a chemical change.

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