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प्रश्न
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
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उत्तर
The following points pertain to chemical changes:
b. The change is permanent.
e. Produces one or more new substances by change in its composition.
The remaining points pertain to physical changes.
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संबंधित प्रश्न
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
Make a list of different types of changes with example.
A burning candle shows both physical and chemical changes. Explain ?
Write true or false
Decomposition of leaves is a fast change.
A physical change is temporary. Explain.
Classify the following as a physical or a chemical change.
Boiling of water
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Filling up a balloon with hot air is a _______ change.
Physical Change: Boiling::Chemical Change: ______.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
