Formulae And Equations

Question 1

Simple ion charges

Answer 1

G1, 1+
G2, 2+
G3, 3+
G5, 3-
G6, 2-
G7, 1-
T, many

Question 2

Binary compounds

Answer 2

Contains 2 elements only
(Element 1)(Element 2) ide
Metal ions always come first

Question 3

Ammonium

Answer 3

NH+

Question 4

Hydroxide

Answer 4

OH-

Question 5

Nitrate

Answer 5

NO3-

Question 6

Nitrite

Answer 6

NO2-

Question 7

Hydrogen carbonate

Answer 7

HCO3-

Question 8

Manganate (7) (permanganate)

Answer 8

MnO4-

Question 9

Carbonate

Answer 9

CO3 2-

Question 10

Sulfate

Answer 10

SO4 2-

Question 11

Sulfite

Answer 11

SO3 2-

Question 12

Dichromate (6)

Answer 12

CrO7 2-

Question 13

Phosphate

Answer 13

PO4 3-

Question 14

Writing formulae from ions

Answer 14

Overall charge is zero, ionic charges must balance

Question 15

Writing equations

Answer 15

Take care with diatomic molecules and P4
No ions exist as molecules
Ionic formulas worked out from ionic charges

Question 16

(S)

Answer 16

Solid

Question 17

(L)

Answer 17

Liquid

Question 18

(Aq)

Answer 18

Aqueous

Question 19

(G)

Answer 19

Gas

Question 20

Balancing equations

Answer 20

Only change balancing numbers
Do not change the formula
Only balanced when there are the same number of each element on each side of the equation
Brackets