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प्रश्न
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
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उत्तर
Change is the law of nature that occurs in everyday life. A substance [i.e. matter] undergoes a kind of change when subjected to energy changes.
The matter is said to undergo certain changes when energy is added to the matter or removed from the matter.
Examples of Changes are:
- Ice melts on supplying heat to it.
- Milk changes into curd when a little curd is added to hot milk.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
Classify the following as chemical or physical change:
Dissolving common salt in water.
State the various conditions that favour the process of evaporation.
Write true or false
Melting of ice is a physical change.
Classify the following changes as physical or chemical.
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
Sublimation of Iodine is a ______.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
