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प्रश्न
Explain in brief the involvement of energy in physical and chemical changes.
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उत्तर
Involvement of energy in physical and chemical changes
- Physical changes use energy to change the state of matter,
- Chemical changes release or absorb energy when changing a substance into a new substance.
Energy is released during the decomposition of a substance while energy is absorbed during the formation of a new substance.
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संबंधित प्रश्न
What do you observe when :
solid ammonium chloride is heated
State whether the following is physical or chemical changes.
burning of wood -
Tick (√) the correct alternative from the choice given for the following statement
When sugar is heated, its colour changes into
Melting of solid (wax) is a physical change.
Distinguish between the following.
Natural change and man-made change
Under which different types can the following changes be classified?
Revolution of the earth around the sun.
How can a change occur in a substance?
Paper, LPG, CNG petrol, etc, are ______ substances.
The difference between initial state and the final state is called change.
______ is the process in which something becomes different from what it was earlier.
