PARTICLE THEORY
All matter is made from tiny
Particles
Describe a solid in terms of spaces between particles - very close together/close/far apart
Particles are very close together in a solid
When a liquid changes to a gas the liquid needs to be cooled/heated
heated
Spaces between gas particles...
Far apart
Ice turning into liquid water
Melting
Word used to describe everything around us that has mass
Matter
Describe a solid in terms of particle movement
vibrate in fixed position
The attractive forces holding particles together in a liquid are weaker/stronger than in a solid
weaker
Gas particles have high/low forces of attraction between them.
low
Vapour cooling and turning into a liquid
condensation
Particles move faster at HIGH/LOW temperatures
HIGH
Describe a solid in terms of attractive forces between particles (weak/strong/very strong)
Attractive forces between particles in a solid are very strong
The attractive forces particles in a liquid are stronger/weaker than those in a gas
stronger
Gases form when liquids...
evaporate
Water boils and evaporates at
100 degrees Celcius
When a liquid evaporates its mass will INCREASE/DECREASE if particles escape.
DECREASE
When a solid melts, the attractive forces between particles get stronger/weaker.
When a solid melts, the attractive forces between particles get weaker.
(true or false) When a liquid freezes the particles loose energy and get closer together.
True
Gases can be compressed because
there are spaces between particles/particles are far apart/particles can be pushed even closer together
When a gas condenses the particles get further apart/closer together
closer together
What happens to the mass of a liquid when it freezes?
stays the same/does not change
When a solid is heated the particles vibrate more, this can cause the solid to ....... before it melts.
Expand/get bigger
Liquids take the shape of a container because the particles are
free moving/flowing/held by weak forces between particles
Gases can build up ____________ if they are heated in a closed container
pressure
When water cools and condenses in the sky, then falls as rain, sleet, hail or snow, we call it...
Precipitation