Polyatomic Ions

Question 1

If a polyatomic ion contains oxygen, what is it called?

Answer 1

An oxyanion

Question 2

Which PAI are cations?

Answer 2

NH4+ and Hg2 2+

Question 3

Given two variations of a PAI, what is the naming scheme?

Answer 3

Less oxygen: ITE suffix (SO3=sulphite)
More oxygen: ATE suffix (SO4=sulphate)

Question 4

Given four variations of a PAI, what is the naming scheme?

Answer 4

1 Oxygen (least): Hypo prefix + Ite suffix
2 Oxygen (middle-least): Ite suffix
3 Oxygen (middle-most): Ate suffix
4 Oxygen (most): Per prefix + Ate suffix

Question 5

For variations of an acid, what is the naming scheme?

Answer 5

Least Oxygen: Hypo prefix + OUS suffix
Less Oxygen: OUS Suffix (H2SO3= Sulphurous acid)
More Oxygen: IC suffix (H2SO4= Suphuric acid)
Most Oxygen: Per prefix + IC suffix

Question 6

For acids without oxygen, what is the naming scheme?

Answer 6

The name of the acid contains the Hydro prefix
(HCN= Hydrocyanic Acid)

Question 7

What is the charge on all Nitrogen Based PAI?

Answer 7

Both Nitrogen based PAI have charges of -1
(Nitrate and Nitrite)

Question 8

What is the charge on all Sulphur Based PAI?

Answer 8

Both Sulphur based PAI have charges of -2
(Sulphite and Sulphate)

Question 9

What is the charge on all Chlorine Based PAI?

Answer 9

All 4 Chlorine based PAI have charges of -1
(hypochlorite, chlorite, chlorate and perchlorate)