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प्रश्न
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.
Slow and fast change.
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उत्तर
| Slow change | Fast change |
| (i) Changes which occur – very slowly over days, months, or years. | (i) Changes which occur – very rapidly in seconds or minutes. |
| (ii) Examples: Growth of a tree from a seed - a few years, tooth decay, change of seasons, growth of many rusting of iron | (ii) Examples: Occurrence of lightning - a few seconds, burning of paper or match, lighting a bulb, bursting of fireworks. |
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
burning of sugar —
Give four difference between physical and chemical changes.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
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.
Cutting a log of wood into pieces is a chemical change.
Mention a few physical properties of a substance.
