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प्रश्न
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.
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उत्तर
- (b) Vaporisation
- (d) Freezing
- (a) Melting
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संबंधित प्रश्न
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
Write true or false for the statement
Decomposition of leaves is a fast change.
State whether the following is physical or chemical changes.
mixing oil with water —
Write true or false
Decomposition of leaves is a fast change.
Classify the following as a physical or a chemical change.
Burning of paper
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
In a solution of salt in water, water is the solute
Mention a few physical properties of a substance.
