Module 2

Question 1

Proton Number

Answer 1

The number of protons in the nucleus of an atom

Question 2

relative atomic mass

Answer 2

The weighted mean mass of an atom of an element compared with
one-twelfth of the mass of an atom of carbon-12.

Question 3

relative formula mass

Answer 3

The weighted mean mass of the formula unit of a compound compared
with one-twelfth of the mass of an atom of carbon-12.

Question 4

relative isotopic mass

Answer 4

The mass of an atom of an isotope compared with one-twelfth of the
mass of an atom of carbon-12.

Question 5

relative molecular mass

Answer 5

The weighted mean mass of a molecule of a compound compared

with one-twelfth of the mass of an atom of carbon-12.

Question 6

isotopes

Answer 6

Atoms of the same element with different numbers of neutrons and different masses

Question 7

molar mass

Answer 7

The mass per mole of a substance

Question 8

mole

Answer 8

The amount of any substance containing as many elementary particles as there are carbon
atoms in exactly 12 g of the carbon-12 isotope, that is, 6.02 × 1023 particles.

Question 9

anhydrous

Answer 9

Containing no water molecules

Question 10

anion

Answer 10

A negatively charged ion with more electrons than protons.

Question 11

cation

Answer 11

A positively charged ion with fewer electrons than protons.

Question 12

concentration

Answer 12

The amount of solute, in moles, dissolved in 1dm3
(1000 cm3
) of solution

Question 13

empirical formula

Answer 13

a The formula that shows the simplest whole-number ratio of atoms of each
element present in a compound.

Question 14

hydrated

Answer 14

A crystalline compound containing water molecules

Question 15

molecular ion

Answer 15

The positive ion formed in mass spectrometry when a molecule loses an electron

Question 16

water of crystallisation

Answer 16

Water molecules that are bonded into a crystalline structure of a
compound

Question 17

Equation to work out moles of a solid

Answer 17

Moles = mass/Mr

Question 18

Equation to work out moles of a solution

Answer 18

moles = MV/1000

Question 19

Equation to work out moles of a gas (in standard conditions)

Answer 19

moles = volume (dm3)/24

Question 20

Ideal Gas Equation

Answer 20

PV=nRT
P = pressure in Pa
V = volume in m3
n = no. of moles
R = gas constant (8.31)
T = temperature in K

Question 21

What is 25oc in Kelvin?

Answer 21

25+273 = 298K

Question 22

Define strong acid

Answer 22

Completely dissociates in aqueous solution

Question 23

Define weak acid

Answer 23

Partially dissociates in aqueous solution

Question 24

Define Bronsted-Lowry acid

Answer 24

Proton donor

Question 25

Define base

Answer 25

Proton acceptor

Question 26

Define salt

Answer 26

When the proton of an acid is replaced by a metal ion

Question 27

Define oxidation

Answer 27

Loss of electrons

Question 28

Define reduction

Answer 28

Gain of electrons

Question 29

What is the oxidation number of any element

Answer 29

0

Question 30

What is the oxidation number of oxygen generally (with the exception of in peroxide)

Answer 30

-2

Question 31

What is the oxidation number of sulphur in CaSO4

Answer 31

+6