Naming

A

1

K₂S

potassium sulfide

2

F₂

fluorine

3

NH₃

ammonia

4

SO₃

sulfur trioxide

B

1

HCl

hydrochloric acid

2

CO

carbon monoxide

3

NaOH

sodium hydroxide

4

CaCO₃

calcium carbonate

C

1

Mn

manganese

2

P₄

phosphorus

3

BaSO₄

barium sulfate

4

CuCl₂

where Cu is a Cu²⁺ ion

copper (II) chloride

D

1

H₂CO₃

carbonic acid

2

SO₂

sulfur dioxide

3

NH₄Cl

ammonium chloride

4

CH₄

methane