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प्रश्न
Compare the energy changes involved during a physical and a chemical change.
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उत्तर
- Physical change: No gain or loss of energy during physical change.
The energy required for completion of a physical change is released when the change is reversed. - Chemical change: Energy is either absorbed or evolved during the chemical change.
The energy in the form of light, percussion (pressure), or generally heat energy is required for a chemical change.
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संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
Melting of solid (wax) is a physical change.
How do you say that the process of digestion is a chemical change ?
Write true or false
Cutting of paper into pieces is a chemical change.
Write true or false
Burning of sugar is a temporary change.
What are man-made changes ?
Classify the following as a physical or a chemical change.
Burning of coal
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
What will you take into account while identifying the following?
A chemical change in a substance.
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
