Question

1 What do we observe when salt is added to water and stirred?

2 Define Kinetic energy.

3 Why do liquids diffuse faster than solids?

4 Why is balloon seller able to fill a large number of balloons from a single cylinder of air?

5 A sponge is compressible, yet it is classified as a solid. Explain. Why?

6 Salt can take the shape of a spoon or a jar in which it is kept, yet it is classified as a solid. Why?

7 What is sublimation? Name two substance which sublime.

8 Define Latent heat of vaporization.

9 Boiling is a bulk phenomena. Explain.

10 Why do people sprinkle water on open ground on a hot, dry day?

11 You have two beakers, one has ice at 0°C and the other has water at 0°C. In which beaker will the temperature increase faster and why?

12 Differentiate between evaporation and boiling.

13 Explain how evaporation case cooling.

14 How will you justify that ice, water and steam are the three states of a substance and not different substances

​

Answer 1

Answer:

1 .the salt particles settle down.

2.energy posessed by an object due to its motion.

3.because they easily evaporate.

7.the process of converting solid directly into gas. e.g. napthalene balls , ammonium chloride.

8.it is the amount of 1 kg of liquid which is converting into gas under its boiling point.