C1

Question 1

Describe particles in a solid

Answer 1

Particles only vibrate about fixed positions, regular structure

Question 2

Describe particles in a liquid

Answer 2

Particles can move around each other, collide often

Question 3

Describe particles in a gas

Answer 3

Particles move freely and at random in all directions, collide less often than in a liquid

Question 4

Explain what happens to the temperature during melting

Answer 4

The temperature stays constant as energy is used to weaken the intermolecular forces and change the substance from a solid to a gas.

Question 5

Explain what happens to the temperature during boiling

Answer 5

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

Question 6

Describe an atom

Answer 6

The smallest part of an element

Question 7

Describe a molecule

Answer 7

A group of atoms covalently bonded together (eg o2 or H2O)

Question 8

Describe an ion

Answer 8

A charged particle (Na+ or So4 2-)

Question 9

Describe a diffusion

Answer 9

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

Question 10

Explain the factors that affect diffusion

Answer 10

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

Question 10

Explain the factors that affect diffusion

Answer 10

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