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प्रश्न
Compare the energy changes involved during a physical and a chemical change.
उत्तर
- Physical change: No gain or loss of energy during physical change.
The energy required for completion of a physical change is released when the change is reversed. - Chemical change: Energy is either absorbed or evolved during the chemical change.
The energy in the form of light, percussion (pressure), or generally heat energy is required for a chemical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Cutting of trees
Try segregating the things around you as pure substances or mixtures.
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
Fill in the blank.
An earthquake is a .................. change.
True or false
Change of seasons is a non-periodic change.
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
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
Is a change of state of matter – a physical or a chemical change. Give reasons.
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
What type of change is colouring of a paper?
