1. Give two examples of matter.
2. Write two examples of diffusion.
3. Define sublimation.
4. What do you mean by condensation ?
5. Which state of matter have definite volume but no fixed shape ?
6. Define absolute temperature.
7. Define the term 'latent heat of fusion'.
8. Which type of gases move upwards ?
9. What are the three states of matter ?
10. In which state, the particles have the maximum kinetic energy ?
11. Write the value of latent heat of vaporisation of water.
12. Which type of process is evaporation : exothermic or endothermic ?
13. What is value of 23°C on Kelvin scale ?
14. Which property of gases has not been possessed by solids ?
15. Convert 310 K to the Celsius scale.
Answers
Explanation:
1. air , even yourself
2. *Perfume is sprayed in one part of a room, yet soon it diffuses so that you can smell it everywhere.
*A drop of food coloring diffuses throughout the water in a glass so that, eventually, the entire glass will be colored.
3. Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state.
4. Condensation. The phenomenon of change of gas to liquid is called condensation.
5. liquid has a definite volume but no definite shape,
6. Absolute temperature, also called thermodynamic temperature, is thetemperature of an object on a scale where 0 is taken as absolute zero.
7. The enthalpy of fusion of a substance, also known as heat of fusion is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.
8. Most hydrogen atoms move upward, as do ALLcarbon dioxide molecules
9. solid , liquid and gas.
10. The kinetic energy of particles is maximum in gas as the particles are free to roam with maximum speed as there is negligible force of attraction between the particle
11. The latent heat of vaporization for water is 22.6 x 10^5 J/kg. This means that 22.6 x 10^5 J ofheat energy must be added to turn one kilogram of water from liquid to gas at 100 degrees Celsius.
12. Evaporation is endothermic because water molecules must absorb heat from the surroundings to increase their kinetic energy.
13. 296.15 kelvins
14. All solids, liquids and gas possess mass and volume. Conductivity is notdependent on the state of matter - conductors can be solids, liquids orgases. However, fluidity is the property possessed only by liquids and gases.Solids never posses fluidity - they are hard and have a definite shape.
15. 36.85 degrees celsius.
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