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प्रश्न
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.
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उत्तर
If a change is permanent and irreversible it is considered a chemical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
State whether the following is physical or chemical changes.
respiration in living beings —
Tick the most appropriate answer.
Photosynthesis requires
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Define a chemical change. Give two examples of the above changes.
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.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
