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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 :
a piece of paper is burnt
State whether the following is physical or chemical changes.
Melting of wax —
Tick (√) the correct alternative from the choice given for the following statement
When sugar is heated, its colour changes into
True or false?
During a physical change energy is either given out or absorbed by the system.
True or false?
In a chemical change, rearrangement of molecules and atoms involves some energy changes.
Fill in the blank
An earthquake is a _______ change.
Distinguish between the following.
Periodic change and non-periodic change
Distinguish between the following.
Natural change and man-made change
Under which different types can the following changes be classified?
Bursting of a cracker.
How can a change occur in a substance?
