1.1 The Particle Model

Question 1

What are the three states of matter

Answer 1

Solid
Liquid
Gas

Question 2

What happens at the melting point

Answer 2

melting and freezing

Question 3

what happens at the boiling point

Answer 3

boiling and condensing

Question 4

How are the states of matter represented

Answer 4

Solid: close together, regularly arranged
Liquid: close together, random arrangement
Gas: spread apart, random arrangement

Question 5

chemical changes

Answer 5

requires a chemical reaction
needs to be change from reactants and products

Question 6

Physical changes

Answer 6

needs energy
change in state but no change in particles

Question 7

examples of physical changes

in the particle model

Answer 7

melting
boiling
freezing
condensing

Question 8

limitations of particle model: forces of attraction

Answer 8

amount of energy needed to change state depends on the strength of the forces between particles
stronger forces= higher MP and BP

Question 9

limitations of the particle model: size and space

Answer 9

nature of particles depends on the type of bonding and structure