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प्रश्न
State whether the following is physical or chemical changes.
burning of wood -
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उत्तर
chemical change,
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
passing electric current through a heater rod —
Tick (√) the correct alternative from the choice given for the following statement
Burning is a
True or false?
In a chemical change, rearrangement of molecules and atoms involves some energy changes.
Melting of solid (wax) is a physical change.
Under which different types can the following changes be classified?
Conversion of milk into yoghurt.
Under which different types can the following changes be classified?
Bursting of a cracker.
Under which different types can the following changes be classified?
Stretching of a spring.
Give reason.
While purchasing canned food, its expiry date should be checked.
Explain in brief the involvement of energy in physical and chemical changes.
How can a change occur in a substance?
