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

Answer in Brief

When baking soda (Sodium hydrogen carbonate) is mixed with lemon juice (citric acid), bubbles form. The bubbles are formed due to the evolution of carbon dioxide gas, which is a chemical change.
In this change, the citric acid in lemon juice reacts with sodium hydrogen carbonate, resulting in the evolution of carbon dioxide gas.

\[\ce{\underset{(Sodium bicarbonate)}{Baking Soda} + Lemon juice -> \underset{(CO2)}{Carbon dioxide} + Other substances}\]

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Chapter 5 Physical and Chemical Changes
Exercises | Q 4. | Page 55

Fill in the blank:

The basic conditions necessary for a chemical reaction is _______

Name the type of chemical reaction shown by the following equation:

CaCO₃ → CaO + CO₂

Explain the term reactant and product giving examples.

State the type of reactions for the following represent and balance the ones that are not balanced.

NaOH + HCl → NaCl + H₂O

What is a chemical change? Give two examples of chemical change?

A chemical reaction is often accompanied by external indications or characteristics which include –

With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.

State the following reaction represent oxidation or reduction.

\[\ce{Cu++->Cu}\]

The water we drink is a combination of hydrogen and oxygen.

Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings

Write the equation for the process of formation of rust.