Unit one

Question 1

relative atomic mass

Answer 1

the mean mass of an element compared to the mass of one twelfth of a carbon-12 atom

Question 2

relative isotopic mass

Answer 2

the mean mass of an isotope compared to tge mass of one twelfth of carbon-12

Question 3

isotopes

Answer 3

isotopes have the same number of electrons and protons but a different number of neutrons

Question 4

spectrometer

Answer 4

used to measure the mass of an isotope/element

Question 5

hydrochloric acid

Answer 5

HCl

Question 6

nitric acid

Answer 6

HNO3

Question 7

sulphuric acid

Answer 7

H2SO3

Question 8

silver chloride

Answer 8

AgCl

Question 9

sodium hydroxide

Answer 9

NaOH

Question 10

calcium carbonate

Answer 10

CaCO

Question 11

ammonium

Answer 11

NH4

Question 12

what is the ionic charge of a magnesium ion

Answer 12

+2

Question 13

what is the ionic charge of a fluoride ion

Answer 13

-

Question 14

what is the ionic charge of an aluminum ion

Answer 14

+3

Question 15

what is the ionic charge of a carbonate ion

Answer 15

-2

Question 16

what is the ionic charge of a sulphate ion

Answer 16

-2

Question 17

what is the ionic charge of a hydroxide ion

Answer 17

-

Question 18

what is the ionic charge of an ammonium ion

Answer 18

+

Question 19

what are the seven elements that exist as diatomic molecules

Answer 19

Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine and Iodine

Question 20

moles =

Answer 20

mass / Mr

Question 21

moles =

Answer 21

number of atoms / avogadros number

Question 22

Avogadro’s number

Answer 22

6.02 x 10^23

Question 23

moles =

Answer 23

volume (dm^3) / 24

Question 24

moles =

Answer 24

concentration (moldm^-3) x volume (dm^3)

Question 25

steps for empirical formula

Answer 25

calculate moles, divide by smallest, whole number ratio, empirical formula

Question 26

multiple =

Answer 26

relative molecular mass / mass of empirical formula

Question 27

% error =

Answer 27

[(number of readings x error) / amount] x 100

Question 28

how to identify x in a salt

Answer 28

calculate moles of water lost, ratio of anhydrous salt to water, moles of anhydrous salt, find Mr, identify x

Question 29

ideal gas equation

Answer 29

pressure (pa) x volume (m^3) = moles x 8.314 (Jmol^-1K^-1) x temperature (K)

Question 30

how to convert C to K

Answer 30

K = C + 273

Question 31

how to covert kPa to Pa

Answer 31

1kPa = 1000Pa

Question 32

room temp =

Answer 32

298K (25C)

Question 33

regular pressure =

Answer 33

100000Pa (100kPa)

Question 34

atom economy =

Answer 34

(molecular mass of wanted product / molecular mass of products) x 100

Question 35

percentage yield =

Answer 35

(actual amount / theoretical amount) x100