Question

what is meant by the change of state? describe an example to show that change in temperature can cause change in physical state of matter

Answer 1

the change of state shows that the change in the space between molecules or particles.Ex.ice changes into water

Answer 2

Answer:

Cause of different physical states of matters:

The physical states of matter depend upon three main factors:

• The force of attraction between particles.
• The space between the particles.
• The kinetic energy of particles.

Solid:

• The force of attraction between the particles of solids is very strong.
• There are minimum spaces between the particles of solids.
• The particles of solids have minimum kinetic energy.
• Because of great force of attraction particles of solids are closely packed together. This makes the space between particles of solids almost negligible. The lowest kinetic energy of particles does not able to move the particles of solids.

Hence, the great force of attraction and least space between particles of solids and lowest kinetic energy of particles keep the particles at fixed places. Because of the combination of these characters matter exists in solid state.

Liquid:

• The force of attraction between particles of solid is strong but less strong than solids.
• The space between particles is more than that of solid but not too more.
• The kinetic energy of particles is greater than solid.
• Strong force of attraction keeps the particles of liquids packed together. But the force of attraction between particles of solids is less strong than that of solid. Because of this particles of liquids are loosely packed compared to solid. The kinetic energy of particles of liquids is greater than that of solids.

Because of more space between particles and more kinetic energy than solids the particles of liquids slide over one another. These characters make a matter to exist in liquid state. Liquid can flow because its particles can slide over one another.

Gas

• The force of attraction between particles of gas is almost negligible.
• The space between particles of solid is greatest.
• The particles of gases have greatest kinetic energy.
• Because of negligible force of attraction the particles of gases are loosely packed consequently there are lots of spaces between their particles. Because of greatest kinetic energy the particles of gas move with high speed.

Because of negligible force of attraction between particles and greatest kinetic energy the particles of gas have always tendency to escape out. Because of these characters a matter exists in gaseous state.

• A matter exists in solid state because of greatest force of attraction between its particles which makes the particles closely packed.

• A matter exists in liquid state because of less force of attraction between its particles than a solid, which makes the particles closely packed but allow to slide over one another.

• A matter exists in gaseous state because of almost negligible force of attraction between its particles, which is unable to keep the particles bonded together.