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प्रश्न
Give reasons for the following:
Water on freezing turns into ice.
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उत्तर
Every pure substance has a fired melting point or boiling point.
संबंधित प्रश्न
Give reasons for the following observation:
The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.
Define interconversion of states of matter. What are the two factors responsible for the change of states of matter?
What is volume ?
What are fluids ? Give two examples.
Fill in the blank:
The temperature at which a liquid boils is called the................. point of that liquid.
Match the following
| Column A | Column B |
| (a) Solids | (1) Can flow in all directions. |
| (b) Sublimation | (2) The temperature at which a liquid changes into its gaseous state. |
| (c) Boiling point | (3) Any number of free surfaces. |
| (d) Gases | (4) Gaps between particles. |
| (e) Intermolecular space | ro(5) Change of state fm solid to gas. |
Name the phenomenon which cause the following change:
Conversion of ice into water.
How will you prove by an experiment that solids occupy space ?
Give an experiment to explain that there are intermolecular spaces between water molecules.
Explain the following :
When an incense stick is lighted in the corner of a room, its fragrance spreads quickly in the entire room.
