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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
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Distinguish between the following.
Physical change and chemical change
What will you take into account while identifying the following?
A chemical change in a substance.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Is a change of state of matter – a physical or a chemical change. Give reasons.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
Filling up a balloon with hot air is a _______ change.
