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प्रश्न
State whether the following is physical or chemical changes.
mixing oil with water —
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उत्तर
physical change.
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संबंधित प्रश्न
Write true or false for the statement
Decomposition of leaves is a fast change.
What are reversible and irreversible changes ? Give one example for each.
State three differences between evaporation and boiling
State whether the following is physical or chemical changes.
respiration in living beings —
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
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 |
Wood to sawdust:______:: Wood to Ash: Chemical change
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Gas exists in three states as solid, liquid, and gas.
