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प्रश्न
Given reason:
Burning of paper is a chemical change.
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उत्तर
When a piece of paper is burnt a new substance ash is produced. Even when the burning is stopped, the ash cannot be changed back into paper. This shows that the formation of the ash from paper is a permanent and irreversible 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.
Try segregating the things around you as pure substances or mixtures.
State whether the following is physical or chemical changes.
mixing oil with water —
State whether the following is physical or chemical changes.
Slaking of lime —
Write true or false
Melting of ice is a physical change.
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :
- Sublimation.
- Fermentation.
- Liquefaction or condensation.
- Magnetization.
- Respiration.
Filling up a balloon with hot air is a _______ change.
Mention some of the different conditions needed for chemical changes to occur.
Explain the characteristics of physical change with examples.
