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प्रश्न
Name the phenomenon which cause the following change.
Disappearance of camphor.
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उत्तर
Disappearance of camphor is sublimation.
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संबंधित प्रश्न
Water at 100°C has more heat than the steam at 100°C.
Fill in the blank
The molecular motion in liquid and gas is in ................. path.
Give the molecular model for a solid and use it to explain why a solid has a definite volume and a definite shape.
Distinguish between solids, liquids, and gases on the basis of their following properties :
(a) compressibility
(b) fluidity
(c) rigidity
(d) expansion on heating
Fill in the blank
Water is a matter because it has ............ and occupies ............
Fill in the blank
Any matter which has a definite ................. but no definite shape is called a ...............
Match the following
| Column A | Column B | ||
| a | Solids | 1 | Can flow in all directions |
| b | Sublimination | 2 | The temperature at which a liquid changes into its gaseous state |
| c | Boiling Point | 3 | Can have any number of free surfaces |
| d | Gases | 4 | Gaps between particles |
| e | Intermolecular space | 5 | Change of state from solid to gas |
Explain the term ‘matter'
State what would you observe if
(a) sugar is added to pebbles take in a plastic beaker
(b) sand is added to glass balls in a beaker. What would you conclude from this imaginative demonstration?
State the correct term from A, B, C, D, E, or F in List II which represents the change of state of matter or its relevant property from List I.
| List I | List II |
| 1. Solid 'X' to a Liquid 'X' | A: Condensation |
| 2. Liquid 'Y' to its vapour 'Z' | B: Vaporization |
| 3. 'Z' to 'Y' | C: Melting |
| 4. 'Y' to 'X' | D: Freezing |
| 5. The temperature at which 'Y' changes to 'Z' | E: Melting point |
| F: Boiling point |
