C1: Fundamental Ideas (1)

Question 1

Diffusion

Answer 1

The automatic mixing of liquids and gases as a result of the random motion of their particles

Question 2

What sort of particles diffuse the quickest?

Answer 2

Small, light ones.

Question 3

Does diffusion take place faster in a liquid or a gas?

Answer 3

Gas, move around faster, more chance of a collision.

Question 4

Elements

Answer 4

Substances made up of only one type of atom.

Question 5

Compound

Answer 5

A substance made out of two or more elements chemically bonded together.

Question 6

Mixture

Answer 6

When substances are mixed together and intermingle but do not react.
A mixture is not a pure substance.

Question 7

Atomic no.

Answer 7

No. of protons.
BOTTOM NUMBER

Question 8

Atomic Mass no.

Answer 8

No. of protons plus neutrons.
TOP NUMBER

Question 9

No. of Protons =

Answer 9

No. of electrons.

Question 10

What does the number of electrons on the outer shell of an element tell us?

Answer 10

What group it is in, and how it reacts.

Question 11

Why does the relative atomic mass only count protons and neutrons?

Answer 11

Because electrons weigh 1/2000 of what protons and neutrons weigh, so are generally discounted.

Question 12

Isotopes

Answer 12

Atoms of the same element with different numbers of neutrons.