Q.1. A simple of water under study was found to boil at 102°c at normal temperature and pressure .is the water pure ? Will this water freeze 0°c? Comment.
Q.2. A student heats a beaker containing ice and water . He measure the temperature of the beaker as a function of time. Which of the following would correctly represent the results?
Q.3. fill ups
1. Evaporation of a liquid at room temperature leads to a_____ effect.
2. At room temperature the forces of attraction between the parties of solid substance are_______than those which exist in the gaseous state.
3. The arrangement of particles is less ordered in the ____ state however ,there is no order in the ___state.
4. ______is the change of gaseous state directly to soils state without going though the____state.
5. The phenomenon of change of a liquid into the gaseous state at my temperature below its boiling point is called ____.
Q.4 match the following
1) pressure. 1)cubic metre
2) temperature. 2) kilogram
3)density 3)pascal
4)mass. 4)Kelvin
5)volume. 5) kilogram per cubi metre
Q.5.osmosis is a apical kind of diffusion comment.
Q6.water as ice has cooling . Whereas water as steam may cause severe burns. Explain observation.
Q.7alka was making tea in a kettle suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle . She wondered whether the temperature of steam was higher than that of the water boiling in the kettle. Comment.
Q.8. (a) conversion of solid to vapour is called sublimation. Name the term used to donate the conversion of vapour to solid.
(B) conversion of solid to liquid state is called Fusion, what is meant by latent heat of fusion?
Answers
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1. No. The water is impure. it contains some impurities .Also, since the given sample is not pure, therefore it will not freeze at 0°C (freezing point of pure water) but at a lower temperature.
8. a) Sublimation is the process which is conversion from solid to vapour and vise versa
b) latent 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.
7. the temperature of both boiling water and steam is hundred degree Celsius but still has more energy because of latent heat of vaporization.
6. in case of ice the water molecules have low energy while in the case of steam the water molecules have high energy. The high energy of water molecules in steam is transformed as heat and may cause Burns. on the other hand, in case of ice, water molecules take energy from the body and this give a cooling effect.
3. a) cooling
b) stronger
c) liquid, gaseous
d) Sublimation, liquid
e) evaporation
2. The option is last one..
since Ice and water are in equilibrium the temperature would be zero. When we heat the mixture, energy supplies is utilised in melting the ice and the temperature does not change till all the ice melts because of latent heat of fusion. on further heating the temperature of water would increase therefore, the option correct the last one
8. a) Sublimation is the process which is conversion from solid to vapour and vise versa
b) latent 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.
7. the temperature of both boiling water and steam is hundred degree Celsius but still has more energy because of latent heat of vaporization.
6. in case of ice the water molecules have low energy while in the case of steam the water molecules have high energy. The high energy of water molecules in steam is transformed as heat and may cause Burns. on the other hand, in case of ice, water molecules take energy from the body and this give a cooling effect.
3. a) cooling
b) stronger
c) liquid, gaseous
d) Sublimation, liquid
e) evaporation
2. The option is last one..
since Ice and water are in equilibrium the temperature would be zero. When we heat the mixture, energy supplies is utilised in melting the ice and the temperature does not change till all the ice melts because of latent heat of fusion. on further heating the temperature of water would increase therefore, the option correct the last one
radhika27:
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