Chemistry

Question 1

Describe the arrangement and movement of particles in a solid

Answer 1

Particles are close together in a regular arrangement and vibrate about a fixed position

Question 2

What are the limitations of the particle model?

Answer 2

It does not take into account: the forces between particles, the size of the particles and the space between particles

Question 3

What is a physical change?

Answer 3

A change that does not produce a new substance. A substance may change its state or shape, or break into pieces.

Question 4

What is a chemical change?

Answer 4

A change that produces one, or more, new substances.

Question 5

State the relative charges of the subatomic particles

Answer 5

Protons +1
Neutrons 0
Electrons -1

Question 6

State the relative masses of the subatomic particles

Answer 6

Protons 1
neutrons 1
electrons 0.0005

Question 7

What is the atomic number of an atom

Answer 7

number of protons in an atom

Question 8

What is the mass number of an atom

Answer 8

The number of protons + neutrons in an atom

Question 9

What do we call an atom that has lost or gain an electron?

Answer 9

ion