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प्रश्न
Select the chemical changes from the following list of changes
Rotting of eggs.
उत्तर
Rotting of eggs is CHEMICAL change, change in composition takes place, is an irreversible process.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Cutting of trees
Write true or false
Burning of sugar is a temporary change.
Tick the most appropriate answer.
Physical changes are
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Fill in the blank.
The process of a liquid changing into a solid is called ________
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic 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.
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
Distinguish physical and chemical changes.
State whether the following statements are true or false:
Anaerobic bacteria digest animal waste and produce biogas.
