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प्रश्न
Write true or false
Burning of paper and formation of curd are reversible changes.
पर्याय
True
False
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उत्तर
False.
Burning of paper and formation of curd are irreversible changes.
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संबंधित प्रश्न
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
True or false
In a physical change no net energy change is involved.
State the various conditions that favour the process of evaporation.
Classify the following as a physical or a chemical change.
Burning of paper
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.
Desirable and undesirable change.
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
What type of energy changes is associated when ice melts?
Grinding of wheat grain changes its size. It is a ____________ change.
The change of state of a substance from solid to liquid and liquid to gas is ______.
