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When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
When baking soda is mixed with lemon juice, the bubbles which are formed with the evolution of a gas is due to the evolution of carbon dioxide gas.
Baking soda + lemon juice $\rightarrow$ CO2 + other substances
(sodium hydrogen carbonate) (Citric acid) (bubbles)
Since there is the formation of a new substance in this reaction, it is a chemical change.
[Extra information: A chemical change affects the internal structure of the substance and leads to the formation of a new substance.
Examples: Photosynthesis, digesting food, rusting of iron, boiling an egg, etc.
Properties of chemical change are as follows:
1. Chemical changes are irreversible. The original form of the matter cannot be attained.
2. It is a permanent change and one or more new substance is formed.
3. During a chemical change, energy is produced in the form of heat, light or sound, while during a chemical reaction, energy is either absorbed or released.
4. Chemical change causes changes in the physical and chemical properties of the substance.]
Updated on: 10-Oct-2022
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