Question

13.
Determine the chemical formulae of the following using the crisscross method:
Iron sulphate, Copper nitrate, Sodium sulphide, Magnesium hydrogencarbonate ( in long )​

Answer 1

Chemical Formulae:

• Iron Sulphate:

Iron having chemical formula 'Fe' and valency usually 2, combines with sulphate of valency 2. So the resulting formula would be FeSO₄

• Copper Nitrate:

Copper has chemical formula of 'Cu' and valency usually 2.

This combines with Nitrate having chemical formula 'NO₃' and valency 1

So the resulting formula would be Cu(N0₃)₂

• Sodium Sulphide:

Sodium has a chemical formula of 'Na' and valency 1.

This combines with Sulphur having chemical formula 'S' and valency 2.

So the resulting formula would be Na₂S

• Magnesium Hydrogen Carbonate:

Magnesium has a chemical formula 'Mg' and valency 2

Hydrogen-Carbonate has a chemical formula 'HCO₃' and valency 1

So the resulting formula would be Mg(HCO₃)₂

Diagrams for each are given in attachment.

Know more:

1. Metals donate electrons and form positive ion.
2. Non metals accept electrons and form negative ion.
3. Bond formed by sharing of electrons between Metals and Non metals is known as Ionic bond

Answer 2

Answer:

Nice

Explanation:

The best answer that l got