Question

6. Give reasons for the following:
(a) Evaporation cools a liquid.
(b) A desert cooler cools a liquid.
(c) Solid carbon dioxide is known as dry ice.
(d) Ice at 0°C is more effective in cooling than water at the same temperature.
(e) Steam causes more severe burns than boiling water.
that tako nlace inside the matter during the change of states.​

Answer 1

Explanation:

Answer:-

1. Evaporation cools a liquid, because it is the convertion of the liquid state into its gaseous form without even reaching its boiling point.
2. Desert cooler let's us feel cool as it works under thr phenomenon of evaporation, drying the sweat which let us feel cool during hot summer days.
3. Solid Carbon Dioxide is Dry Ice as in its solid form, it tries to sublime as a gaseous form and when seen, is called dry ice. It is used to give magical effect in stage performances.
4. Ice at 0°C is more effective in cooling than water at the same temperature because that time, it can absorb more heat under Latent heat of Fusion.
5. Steam causes more severe burns than boiling water because steam has more energy particles, than boiling water possess. It is also the heated form of boiling water.

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Answer 2

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1) evaporation cools a liquid .

Ans => evaporation causes cooling because the process required heat energy the energy is taken away by the molecule when the converted from liquid into gas and this causes cooling on the original surface .

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2) a desert cooler cool a liquid

Ans => in a desert cooler the water inside it is made to evaporate . this leads to absorption of energy from the surrounding their by cooling the surrounding . evaporation depends on the amount of water vapour present in air is the amount of water vapour present in air is less than evaporation is more . on a hot dry day the amount of water vapour present in air is less which water present inside the desert cooler evaporates more and cause cooling the surrounding more .

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3) solid carbon dioxide is known as dry ice .

Ans => solid carbon dioxide is known as dry ice because it does not melt into liquid when it is heated it directly changes into gas this is why it is known as dry ice. this process is known as sublimation .

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4) ice at zero degree celsius is more effective in cooling than water at the same temperature

Ans => this is because ice is more effective in cooling and the water at the same temperature . I can absorb latent heat as well as heat energy in order to attain room temperature this is happening in which water at 0 degree Celsius can absorb heat energy only at the right room temperature .

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5) steam causes more severe burns than boiling water .

Ans => steam has more heat energy than water due to its latent heat of vaporization . for which it will cause more severe burns than the boiling water .

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