C1.1.3 Limitations of the particle model

Question 1

Ratio of distance to diameter equation

Answer 1

ratio of distance to diameter = distance between atoms / diameter of atoms

Question 2

Electrostatic forces of attraction

Answer 2

Forces of attraction or repulsion between electrically charged particles
They weaken the further apart the particles are

Question 3

When are electrostatic forces weakest and strongest?

Answer 3

Strongest in solids

Weakest in gases

Question 4

Limitations of particle model

Answer 4

Do not take into account:

• the forces between particles
• the size of particles
• the space between particles

Question 5

Melting..?

Answer 5

Volume of substance usually increases a little when it melts as some forces of attraction are overcome and the particles can move around each other

Question 6

Evaporation…?

Answer 6

Volume increases a great deal when a liquid becomes a gas but some forces of attraction do remain