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Questions and Answers
Digestion of food in our body is an example of physical change.
Digestion of food in our body is an example of physical change.
False
Vinegar and baking soda react to form a new substance.
Vinegar and baking soda react to form a new substance.
True
Chemical changes are not important in our daily lives.
Chemical changes are not important in our daily lives.
False
Lime water turns milky when carbon dioxide is passed through it.
Lime water turns milky when carbon dioxide is passed through it.
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A chemical change is also called a physical reaction.
A chemical change is also called a physical reaction.
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Medicine is the starting material of a chain of chemical reactions.
Medicine is the starting material of a chain of chemical reactions.
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Plastics are formed through physical changes.
Plastics are formed through physical changes.
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Fermentation of grapes is an example of a physical change.
Fermentation of grapes is an example of a physical change.
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Calcium carbonate is formed when carbon dioxide reacts with lime water.
Calcium carbonate is formed when carbon dioxide reacts with lime water.
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New materials are discovered by studying physical changes.
New materials are discovered by studying physical changes.
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Study Notes
Physical and Chemical Changes
- A change in which one or more new substances are formed is called a chemical change or chemical reaction.
- Chemical changes are very important in our daily lives, forming new substances as a result.
- Examples of chemical changes include:
- Digestion of food in our body
- Ripening of fruits
- Fermentation of grapes
- Production of medicines through a chain of chemical reactions
- Formation of new materials like plastics and detergents through chemical reactions
Rusting of Iron
- Rusting is a chemical change that affects iron articles, slowly destroying them.
- Iron is used in making bridges, ships, cars, truck bodies, and many other articles, resulting in huge monetary losses due to rusting.
Anaerobic Bacteria and Biogas
- Anaerobic bacteria digest animal waste and produce biogas through a chemical change (Change – A).
- The biogas is then burnt as fuel, which is also a chemical change (Change – B).
Cooking Fuels and Chemical Changes
- Burning fuels for cooking is always accompanied by the production of heat.
- Explosion of a firework is a chemical change, producing heat, light, sound, and unpleasant gases that pollute the atmosphere.
Other Examples of Chemical Changes
- Neutralisation of an acid with a base is a chemical change.
- When food gets spoiled, it produces a foul smell, which is a chemical change.
- A slice of apple acquires a brown colour when not consumed immediately, which is due to the formation of new substances through a chemical change.
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Description
Learn about chemical changes and reactions, including examples of digestion, ripening, fermentation, and production of medicines and new materials.
