2.1.3 Amount Of Substance - The Mole

Question 1

What’s the mass and charge of protons

Answer 1

Mass - 1

Charge - +1

Question 2

What’s the mass and charge of electrons

Answer 2

Mass - 1/1840

Charge - -1

Question 3

What’s the mass and charge of neutrons

Answer 3

Mass - 1

Charge - 0

Question 4

What’s the mass number
Another name for it
Where is it

Answer 4

Number of protons and neutrons
(Nucleon number)
Bottom number

Question 5

What’s the atomic number
Another name for it
Where is it

Answer 5

Number or protons
(Proton number)
Top number

Question 6

Why are protons and neutrons the only ones that contribute to mass number

Answer 6

They only have a mass

Question 7

What’s the relative atomic mass (Ar)

Answer 7

The weighted mean mass of 1 atom of an element relative to 1/12 of the mass of an atom of 12C

Question 8

Where’s the relative atomic mass on the periodic table

Answer 8

It’s the mass number of an element

Question 9

What’s the relative molecular mass (just need to know what it is)

Answer 9

The weighted mean mass of 1 molecule of an element/compound relative to 1/12 the mass of an atom of 12C

Question 10

What’s the value of Avogadro’s number

Answer 10

6.02 x 10(23)

Question 11

What’s 1 mole

Why is this called this

Answer 11

6.02 x 10(23)

Called mole for convenience

Question 12

What’s 1 mole (6.02 x 10(23) the exact number if atoms of an element needed for

Answer 12

A mass (in g) equal to its mass number

Question 13

Definition of 1 mole

Answer 13

The amount of substance that contains as many particles as there are atoms in exactly 12g of carbon-12

Question 14

What’s the equation for number of moles

Answer 14

Moles = mass (g)/Mr (gmol-1)

Question 15

What can u work out first when mole equations involve balanced equations

Answer 15

Mr from periodic table

Question 16

How many dm’3 in 1000cm3

Answer 16

1dm3

Question 17

How many litres in 1000cm3/1dm3

Answer 17

1 litre

Question 18

What’s 1dm3 the same as

Answer 18

1 litre

Question 19

What’s the concentration of a solution

Answer 19

The amount it solid material (solute) dissolved in a certain volume of liquid (solvent)

Question 20

When is a solution more concentrated

Answer 20

The more solute dissolved in the liquid

Question 21

What can concentration be measured in

Answer 21

Gdm-3

Question 22

What’s the equation to work out concentrations with gdm-3

Answer 22

Conc = m/v

M = c x v

Question 23

What’s volume measured in

Answer 23

Dm’3

Question 24

But what’s concentration usually measured in

Answer 24

Moldm-3

Question 25

How do you convert gdm-3 to moldm-3

Answer 25

Gdm-3 = moldm-3 x Mr

Question 26

What can moldm-3 also be termed

Answer 26

‘Molar’ unit (M)

Question 27

How do you convert backwards from Moldm-3 -> gdm-3

Answer 27

Moldm-3 x Mr

Question 28

What’s the most important concentration equation

Answer 28

Conc = moles/volume

N = c x v