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प्रश्न
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
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उत्तर
Wax [CxHy]
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संबंधित प्रश्न
Dissolving salt in water is a reversible change.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Write true or false
Burning of paper and formation of curd are reversible changes.
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
Classify the following as physical or chemical change :
Condensation of steam
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Is a change of state of matter – a physical or a chemical change. Give reasons.
Give a reason why rusting of iron is a chemical change but, the magnetization of iron is a physical change.
Which of the following is a physical change?
Give two examples for the following case:
Physical changes which are not reversible
