Question

2. Write the correct formula for each of the following: 

A. sodium chloride B. magnesium bromide 

3. Write the correct formula for each of the following: 

A. copper (II) oxide B. iron (III) oxide 

4. Write the correct formula for the following: 

A. ammonium chloride 

5. Write the correct formula for the following: 

A. magnesium carbonate 

6. Name the following compounds: 

A. MgCI₂ B. AICI₃ 

7. Name the following compounds: 

A NaO

Answer 1

formula is written in the form of A_xB_y , for the two species A and B having valencies/charges y and x respectively.

or more clearly A_{(valency/charge of B)}B_{(valency/charge of A)} without sign

charges/ valencies of used species are as following

Na +1

Cl -1

Mg +2

Br -1

Cu(II) +2

Fe(III) +3

Oxide or O^2- -2

ammonium NH₄⁺ +1

carbonate or CO₃^2- -2

Ans 2 sodium chloride : NaCl  

magnesium bromide : MgBr₂

Ans 3 copper(II) oxide : Cu₂O₂ or CuO

iron(III) oxide: Fe₂O₃

Ans 4 ammonium chloride : NH₄Cl

Ans 5 magnesium carbonate : MgCO₃