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Why does our palm feel cold when we put some acetone or petrol or perfume on it?

Class 9 Chemistry
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How does the water kept in an earthen pot (matka) become cool during summer?

Class 9 Chemistry
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Why does a desert cooler cool better on a hot dry day?

Class 9 Chemistry
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Suggest a method to liquefy atmospheric gases.

Class 9 Chemistry
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For any substance, why does the temperature remain constant during the change of state?

Class 9 Chemistry
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What is the physical state of water at: a. 250ºC b. 100ºC ?

Class 9 Chemistry
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Convert the following temperature to celsius scale: a. 300 K b. 573 K.

Class 9 Chemistry
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Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.

Class 9 Chemistry
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Give reasons (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container. (c) A wooden table should be called a solid. (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.

Class 9 Chemistry
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(a) Tabulate the differences in the characteristics of states of matter. (b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.

Class 9 Chemistry
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The mass per unit volume of a substance is called density. (density=mass/volume). Arrange the following in the order of increasing density – air, exhaust from the chimneys, honey, water, chalk, cotton and iron.

Class 9 Chemistry
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What are the characteristics of the particles of matter?

Class 9 Chemistry
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