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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.
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
State whether the following is physical or chemical changes.
Slaking of lime —
Write true or false
Rusting of iron is a chemical change.
Give two examples of periodic changes.
Make a list of different types of changes with example.
Give the main differences between physical changes and chemical changes.
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Classify the following as a physical or a chemical change.
Butter getting rancid
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Grinding of wheat grain changes its size. It is a ____________ change.
