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प्रश्न
What is a chemical change ? Give two examples of chemical changes.
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उत्तर
Chemical change: These changes occur when a substance combines with another to form a new substance. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
Examples:
- Rusting of iron
- Burning of paper
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संबंधित प्रश्न
A burning candle shows both physical and chemical changes. Explain ?
Write true or false
Burning of paper and formation of curd are reversible changes.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Make a list of different types of changes with example.
Classify the following as a physical or a chemical change.
Butter getting rancid
Compare the energy changes involved during a physical and a chemical change.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Select the chemical changes from the following list of changes
The carbon cycle.
Digestion of food is a physical change.
Distinguish physical and chemical changes.
