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प्रश्न
What will you take into account while identifying the following?
A physical change in a substance.
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उत्तर
Physical changes are those changes in which only the forms of substances get modified; the chemical natures and compositions of the substances involved are not altered.
Characteristics:
- No new substance is formed during a physical change.
- Most physical changes can be reversed easily.
- The chemical composition of a substance undergoing physical change remains the same.
संबंधित प्रश्न
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
Write true or false for the statement
A natural change can also be a desirable change
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Fill in the blank.
The process of a liquid changing into a solid is called ________
Given reason:
Burning of paper is a chemical change.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Natural and man-made change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
