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प्रश्न
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
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उत्तर
Rust of iron is a chemical change as iron rust [Fe2O3χ H20] is a brown flaky powder having a different composition from original iron metal, which is an irreversible change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Write true or false for the statement
Decomposition of leaves is a fast change.
State whether the following is physical or chemical changes.
Slaking of lime —
Tick the most appropriate answer.
Photosynthesis requires
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
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Periodic and non-periodic change
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
