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प्रश्न
Give two examples for the following case:
Physical changes which are reversible
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उत्तर
- Folding of paper
- Melting of ice
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संबंधित प्रश्न
Fill in the blank.
An earthquake is a .................. change.
State the differences between a physical change and a chemical change.
True or false
Change of seasons is a non-periodic change.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
Give the main differences between physical changes and chemical changes.
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Compare the energy changes involved during a physical and a chemical change.
Physical Change: Boiling::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.
