Question

1. drag and drop the formulas with the chemical names.

formulas: feo, hg₂o, hgo, fe₂o₃
choices:

• iron (iii) oxide
• mercury (i) oxide
• mercury (ii) oxide
• iron (ii) oxide

Explanation:

Match each formula to its name by balancing ionic charges:

1. For FeO: Iron has a +2 charge, oxide is -2, so it is iron (II) oxide.
2. For $\text{Hg}_2\text{O}$: Mercury has a +1 charge (two Hg⁺ balance one O²⁻), so it is mercury (I) oxide.
3. For HgO: Mercury has a +2 charge, oxide is -2, so it is mercury (II) oxide.
4. For $\text{Fe}_2\text{O}_3$: Iron has a +3 charge (two Fe³⁺ balance three O²⁻), so it is iron (III) oxide.

Answer:

• $\text{FeO}$: iron (II) oxide
• $\text{Hg}_2\text{O}$: mercury (I) oxide
• $\text{HgO}$: mercury (II) oxide
• $\text{Fe}_2\text{O}_3$: iron (III) oxide