P3 - Particle Model Of Matter

Question 1

What is all matter made up of?

Answer 1

Particles.

Question 2

Describe solids particles?

Answer 2

Strong forces of attraction hold the particles close together in a fixed, regular arrangement. The particles don’t have much energy so they can only vibrate about their fixed positions.

Question 3

Describe liquid particles?

Answer 3

There are weaker forces of attraction between the particles. The particles are close together, but can move past each other, and form irregular arrangements. They have more energy in particles than a solid- moving in random directions at low speeds.

Question 4

Describe gases particles?

Answer 4

There are almost no forces of attraction between the particles. The particles have more energy than in liquids and solids- they’re free to move, and are constantly moving with random directions and speeds.

Question 5

What do colliding gas particles create?

Answer 5

Pressure.

Question 6

What is pressure?

Answer 6

Is the force exerted per unit area.

Question 7

How can you increase the pressure of a gas?

Answer 7

By increasing the temperature.

Question 8

What is density?

Answer 8

Measure of the ‘compactness’ of a substance. It relates the mass of a substance to how much space it takes up.

Question 9

What does the density of an object depend on?

Answer 9

What it’s made of and how its particles are arranged.

Question 10

Describe a dense materials and not dense materials particles?

Answer 10

Dense material - has its particles packed tightly together.

Less dense - more spread out- if you compressed the material the particles would become closer together and more dense.

Question 11

What is internal energy?

Answer 11

The energy stored by the particles that make up a system.