Topic 1

Question 1

5 points of the Particle Model of Matter

Answer 1

1. All substances are made up of tiny particles
2. All particles in a pure substance are the same. Different pure substances are made of different particles
3. The particles have space between them
4. The particles are always in motion, vibrating, rotating, (and in fluids) moving from place to place. The speed of the particles increases/decreases when heat increases/decreases
5. The particles in a substance are attracted to each other. The strength of the attractive forces depends on the type of particle.

Question 2

What are the changes of state

Answer 2

Melting- the process of changing form a solid to liquid
Freezing- the process of changing from a liquid to a solid
Condensation- The process of changing from a gas to a liquid
Vaporization- The process of changing from a liquid to s a gas
Evaporation is slow and boiling is fast
Sublimation- The process of changing from a solid to a gas OR a gas to a solid without going through the liquid state