Is matter around us pure?

What are the characteristics of particles of matter?

Particles have spaces between them, are continuously moving, and attract each other.

What does the fact that particles have spaces between them imply?

It allows matter like lemon and water to mix easily.

What is diffusion?

The intermixing of particles of matter due to their motion.

Name the three states of matter.

Solid, Liquid, Gas.

What are the characteristics of a solid?

Definite shape, distinct boundaries, fixed volume, negligible compressibility.

Why can a diver easily cut through water?

Because the forces of attraction between water molecules are weaker compared to a solid.

What are the characteristics of a liquid?

No fixed shape, fixed volume, can flow and take the shape of its container.

What are the characteristics of gases?

No fixed shape or volume, highly compressible, fill the container, diffuse quickly.

What is melting?

The process of a solid changing into a liquid.

What is the melting point of ice?

0 °C.

What is the boiling point of water?

100 °C.

What is latent heat?

The hidden heat used to change the state of matter without changing its temperature.

What is the latent heat of fusion?

The heat required to change 1 kg of a solid into a liquid at its melting point.

What is the latent heat of vaporization?

The heat required to change 1 kg of a liquid into gas at its boiling point.

What is evaporation?

The process of a liquid changing into a gas at any temperature below its boiling point.

What are the factors affecting the rate of evaporation?

Temperature, Surface area, Humidity, Wind speed.

Why do we feel cold when acetone or perfume is put on our palm?

The liquid absorbs energy from the palm for evaporation, making it feel cold.

Why does an earthen pot

The water evaporates from its tiny pores, making it cooler.