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प्रश्न
Name two reversible changes.
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उत्तर
Melting of ice.
Dissolving of salt in water.
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संबंधित प्रश्न
Explain the following giving an example.
Pure substance
Melting of solid (wax) is a physical change.
Define physical change. Give two examples for the above changes.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
Is a change of state of matter – a physical or a chemical change. Give reasons.
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
Mention some of the different conditions needed for chemical changes to occur.
