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प्रश्न
State four differences between physical and chemical changes.
उत्तर
| Physical change | Chemical change |
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संबंधित प्रश्न
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
State whether the following is physical or chemical changes.
shaping a piece of glass —
State whether the following is physical or chemical changes.
Slaking of lime —
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Sublimation is classified as a physical change. Why ?
Select the chemical changes from the following list of changes
Rotting of eggs.
Select the chemical changes from the following list of changes
The carbon cycle.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
Give two examples for each of the following cases:
Physical changes are reversible.
