Question

names and formulas of compounds
write name for each of the following compounds.

1. na₂s
2. nh₄cl
3. cuf
4. cuf₂
5. pbso₄

write the chemical formula for each of the following compounds.

1. carbon monoxide
2. iron (ii) oxide
3. diphosphorus pentoxide
4. hydrogen sulfate
5. sulfur dioxide

Explanation:

Step1: Name Na₂S

Sodium forms a +1 ion and sulfur forms a -2 ion. The compound is named sodium sulfide.

Step2: Name NH₄Cl

NH₄⁺ is the ammonium ion and Cl⁻ is the chloride ion. The compound is ammonium chloride.

Step3: Name CuF

Copper can have +1 or +2 oxidation states. Here, since fluoride has a -1 charge, copper has a +1 charge and the compound is copper(I) fluoride.

Step4: Name CuF₂

With two fluoride ions each with -1 charge, copper has a +2 charge. It is copper(II) fluoride.

Step5: Name PbSO₄

Lead can have +2 or +4 oxidation states. Sulfate has a -2 charge. Here lead has a +2 charge and the compound is lead(II) sulfate.

Step6: Write formula for carbon monoxide

Carbon has a +2 oxidation state and oxygen has a -2 oxidation state. The formula is CO.

Step7: Write formula for iron (II) oxide

Iron (II) has a +2 charge and oxygen has a -2 charge. The formula is FeO.

Step8: Write formula for diphosphorus pentoxide

The prefixes indicate 2 phosphorus and 5 oxygen atoms. The formula is P₂O₅.

Step9: Write formula for hydrogen sulfate

Hydrogen has a +1 charge and sulfate has a -2 charge. The formula is H₂SO₄.

Step10: Write formula for sulfur dioxide

The prefix indicates 1 sulfur and 2 oxygen atoms. The formula is SO₂.

Answer:

1. sodium sulfide
2. ammonium chloride
3. copper(I) fluoride
4. copper(II) fluoride
5. lead(II) sulfate
6. CO
7. FeO
8. P₂O₅
9. H₂SO₄
10. SO₂