1(e) Chemical formulae, equations and calculations

Question 1

1.25

write word equations and balanced chemical equations (including state symbols):
* for reactions studied in this specification
* for unfamiliar reactions where suitable information is provided.

Question 2

1.26

calculate relative formula masses (including relative molecular masses) (Mr) from
relative atomic masses (Ar)

Question 3

1.27

know that the mole (mol) is the unit for the amount of a substance

Question 4

1.28

understand how to carry out calculations involving amount of substance, relative
atomic mass (Ar) and relative formula mass (Mr)

Question 5

1.29

calculate reacting masses using experimental data and chemical equations

Question 6

1.30

calculate percentage yield

Question 7

1.31

understand how the formulae of simple compounds can be obtained experimentally,
including metal oxides, water and salts containing water of crystallisation

Answer 7

no idea search it up

Question 8

1.32

know what is meant by the terms empirical formula and molecular formula

Answer 8

Empirical: simplest whole number ratio of atoms in a compound e.g. CH3
Molecular: actual number of atoms in a molecule e.g. C2H6

Question 9

1.33

know what is meant by the terms empirical formula and molecular formula