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प्रश्न
Classify the following changes as physical or chemical.
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उत्तर
- boiling — Physical
- curdling of milk — Chemical
- photosynthesis in plants — Chemical
- melting of a solid (wax) — Physical
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Chemical changes are accompanied by changes in energy.
What role does energy play in initiating a chemical change ?
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Compare the energy changes involved during a physical and a 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.
Mention a few physical properties of a substance.
