The Particle Model

Question 1

Solid

Answer 1

Strong forces of attraction hold the particles together, in fixed regular arrangement. Only vibrate about their fixed points.

Question 2

Liquids

Answer 2

There are weaker forces of attraction between the particles. Can move past to form irregular arrangements.

Question 3

Gases

Answer 3

There are almost no forces of attraction between the particles. They are free to move, and are constantly moving with random directions and speeds.

Question 4

Pressure

Answer 4

When the particle collide to other particle, it exert a force to it. The pressure is the force exerted per unit area.

Question 5

Temperature increases pressure of gas

Answer 5

As the particles are moving quicker, it means that they hit the sides of the container more often. It exert a larger force when they collide with the container. This is pressure.

Question 6

Density

Answer 6

It relates to the mass of a substance to how much space it takes up.

Question 7

Density of an object depends on…

Answer 7

What it is made of and how its particles are arranged. A dense material has its particles packed tightly together.

Question 8

Internal energy

Answer 8

Is the total energy that its particles have in their kinetic and potential energy stores.

Question 9

Change in state

Answer 9

Is a physical change. When the substance is heated enough and the particles have enough energy in their kinetic energy stores to break bonds.

Question 10

The number of particles (change in state)

Answer 10

Doesn’t change. The particles are just arranged differently. This means that mass is conserved.