Physics
Match the following
| Column A | Column B |
|---|---|
| (a) Molecules | (i) water boils |
| (b) 100°C | (ii) evaporation |
| (c) 0°C | (iii) changes from solid to gas |
| (d) At all temperatures | (iv) matter |
| (e) Camphor | (v) water freezes |
Matter
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Answer
| Column A | Column B |
|---|---|
| (a) Molecules | (iv) matter |
| (b) 100°C | (i) water boils |
| (c) 0°C | (v) water freezes |
| (d) At all temperatures | (ii) evaporation |
| (e) Camphor | (iii) changes from solid to gas |
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Related Questions
Fill in the blanks:
(a) Evaporation takes place at …………… temperatures.
(b) …………… process is just the reverse of melting.
(c) …………… is a process that involves direct conversion of a solid into its vapour on heating.
(d) The temperature at which a solid converts into a liquid is called its …………… .
(e) The smallest unit of matter that exists freely in nature is called …………… .
(f) Molecules of a substance are always in a state of …………… and so they possess …………… .
(g) Inter-molecular space is maximum in …………… less in …………… and the least in …………… .
(h) Inter-molecular force of attraction is maximum in …………… , less in …………… and the least in …………… .
Write true of false for each statement:
(a) The temperature of a substance remains unaffected during its change of state.
(b) Ice melts at 100°C.
(c) Water at 100°C has more heat than steam at 100°C.
(d) Evaporation of a liquid causes cooling.
(e) Water evaporates only at 100°C.
(f) Boiling takes place at all temperatures.
(g) Evaporation takes place over the entire mass of the liquid.
(h) The process of a gas converting directly into solid is called vaporization.
(i) At high altitudes, water boils above 100°C.
(j) The melting point of ice is 0°C.
Define the term matter. What is it composed of?
State three properties of molecules of matter.