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प्रश्न
Select the chemical changes from the following list of changes
Change of seasons
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उत्तर
Change of season is a PHYSICAL change, only change in temperature is seen and is a reversible change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Classify the following as chemical or physical change:
Burning of paper and wood
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Write true or false
A natural change can also be a desirable change.
Define a chemical change. Give two examples of the above changes.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
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.
A physical change is generally____________.
Grinding of wheat grain changes its size. It is a ____________ change.
