C1

Question 1

Describe particles in a solid (1)

Answer 1

particles only vibrate around a fixed position , regular structure

Question 2

Describe particles in a liquid (1)

Answer 2

particles can more around each other, collide often

Question 3

Describe particles in a gas (1)

Answer 3

particles move freely and randomly in all directions, collide less often then liquid

Question 4

Explain what happens to temperature during melting (1)

Answer 4

the temperature stays constant as energy is used to weaken the intermolecular forces and change the substance from solid to liquid

Question 5

Explain what happens to temperature during boiling (1)

Answer 5

the temperature stays constant as energy is used to break the intermolecular forces and change the substance from liquid to gas

Question 6

Describe an atom (1)

Answer 6

the smallest part of an element

Question 7

Describe an ion (1)

Answer 7

A charged particle (e.g Na+ or SO₄²-)

Question 8

Describe diffusion (1)

Answer 8

The process by which different substances mix as a result of the random motions of their particles

Question 9

Explain the factors that effect diffusion (2)

Answer 9

the higher the temperature the faster the rate of diffusion. the greater the molecular mass the slower the rate of diffusion.