Particle model and states of matter

Question 1

solid

Answer 1

Strong forces of attraction holding the particles close together in a fixed regular arrangement

( not much energy ) so vibrate in fixed position

Question 2

liquid

Answer 2

Weak FOA holding particles quite close together but can move past each other
Irregular arrangement
move in all directions at low speeds ( more energy )

Question 3

gas

Answer 3

More energy than the two
no FOA
free to move
move in all directions at diff speeds

Question 4

What particles cause pressure ?

Answer 4

colliding gas
1) gas particles free to move
2) as they move, they collide into each other and whatever happens to be in the way
3) when they collide with something, they exert a force
4) pressure is force exerted per unit area
5) so in a sealed contained, outward gas pressure is the total force exerted by particles in gas on unit area of container walls.

Question 5

What also increases pressure ?

Answer 5

temp
1 increase temp, transfer energy to KES of particles
2) temp of gases refers to average gas in KES of particles in gas. Higher temp, higher average energy
3) Increase temp of gas, average speed of particles increase, this is due to 1/v mv^2
4) gas at constant volume, increasing temp increases pressure

• particles have more momentum
• exert more force