Key Area 1.5 - Chemical Formulae

Question 1

How to name a chemical compound with 2 element and Oxygen

Answer 1

Consists of the name of both non-oxygen elements but the last part of the second name changes to - ATE or - ITE
Examples
Mg + N2 + O2 = Magnesium Nitrate
Ca + Br + O2 = Calcium Bromate

Question 2

Show the valency of each group from 1-8

Answer 2

Group 1 - 1
Group 2 - 2
Group 3 - 3
Group 4 - 4
Group 5 - 3
Group 6 - 2
Group 7 - 1
Group 8 - 0

Question 3

Calculating the Chemical Formulae system

Answer 3

Symbol
Valency
Swap
Drop

Brackets around groups are essential to show that they atoms are grouped and not individual.
Ionic formulas also show charges

Question 4

Formula prefixes

Answer 4

If a formula has a prefix, the swap and drop process does not take place!
Mon 
Di
Tri
Tetra
Penta
Hexa

Question 5

Transitional Metals

Answer 5

When a transition metal has a numeral next to it, that should be used as its valency during the swap and drop process
I
II
III
IV
V
VI

Question 6

How to name a chemical compound with just 2 elements

Answer 6

The compound name consists of both chemical names but the last part of the second name changes to - IDE
Examples
Mg + O2 = Magnesium Oxide
C + Cl2 = Carbon Chloride