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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
Explain the following giving an example.
Pure substance
What role does energy play in initiating a chemical change ?
Which of the following are physical changes and which are chemical changes ?
Fill in the blank.
The process of a liquid changing into a solid is called ________
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
Select the chemical changes from the following list of changes
Rotting of eggs.
Select the chemical changes from the following list of changes
Change of seasons
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
Give two examples for the following case:
Physical changes which are not reversible
