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प्रश्न
State which of the following pertain to – chemical changes.
(a) Substance retains its identity
(b) The change is permanent
(c) No new substance is formed
(d) Is easily reversible
(e) Produces one or more new substances by a change in its composition
(f) The change is temporary
(g) The composition and properties of the original substance are not altered.
उत्तर
Chemical change :
(b) The change is permanent.
(e) Produces one or more new substances by a change in its composition.
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संबंधित प्रश्न
Try segregating the things around you as pure substances or mixtures.
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
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.
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Select the chemical changes from the following list of changes
Drying of a fruit
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
Tearing of sheet of paper into pieces is ______ By the process of Heating of water, change.
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
Which of the following is not a physical change?
