Atoms

Question 1

Electrons are…

Answer 1

Leptons
They have a small mass and determine whether a molecule will form abound or not
They orbit the nucleus

Question 2

What are the two quarks you need to know?

Answer 2

Up and Down

- have opposing features

Question 3

What are bosons? Name an example

Answer 3

The weak and strong forces responsible for holding atoms together (the ‘glue’) e.g. photons

Question 4

Protons are… (What quarks do they have?)

Answer 4

Positive, and have two up, one down quark

Question 5

Neutrons are… (What quarks do they have?)

Answer 5

Neutral, and have two down, one up quark

Can act as a proton buffer

Question 6

Define mole

Answer 6

The amount of ‘stuff’ (chemical substance)

Question 7

How are moles expressed?

Answer 7

Mole, M

Question 8

What is the mass of one mole of a substance equals to?

Answer 8

Its relative molecular mass expressed in grams

Question 9

What is Avogadro’s constant?

Answer 9

6.02 x 10^23

It is used to work out the number of atoms or molecules in one mole of substance

Question 10

The bigger the volume the … the concentration

Answer 10

Lower

Question 11

Concentration units?

Answer 11

Mol/L, Mol/dm^3

Question 12

Electron sub shells are stacked based on what?

Answer 12

Energy levels

Question 13

Is a full sub shell more or less stable?

Answer 13

More

Question 14

Outline the first sub shell

Answer 14

S shell, lowest energy level, holds 2 electrons

Question 15

Outline the second sub shell

Answer 15

S and P shell, split into two due to repulsion, holds 8 electrons

Question 16

Outline the third sub shell

Answer 16

S, P and D shell, can hold 18 electrons

Question 17

What must a sub shell have in order to be stable?

Answer 17

An up and down quark