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When naming ionic compounds with transition metals you need to include roman numerals to show the _____ of the metal..

• atomic number

• mass number

• charge

• ionization energy

Answer explanation

When naming ionic compounds with transition metals, Roman numerals indicate the charge of the metal ion. This is important because transition metals can have multiple oxidation states, and the Roman numeral specifies which charge is present.

Name this formula:

FePO₄

• Iron Phosphide

• Iron (III) Phosphide

• Iron (I) Phosphate

• Iron Phosphate

• iron (III) phosphate

Answer explanation

The formula FePO4 indicates iron (Fe) combined with phosphate (PO4). The iron is in the +3 oxidation state, making the correct name iron (III) phosphate. Other options are incorrect due to wrong oxidation states or naming conventions.

Name the following compound: Fe(ClO₃)₃

• iron chlorate

• iron (III) chlorate

• iron chloride

• iron (III) chloride

• iron chloride

Answer explanation

The compound Fe(ClO3)3 contains iron in the +3 oxidation state, indicated by the Roman numeral III. Therefore, the correct name is iron (III) chlorate, distinguishing it from other iron compounds.

What is the name of the compound NiCO₃?

• nickel(II) carbonate

• nickel carbonite

• nickel bicarbonate

• nickel(III) carbonate

Answer explanation

The compound NiCO3 is named nickel(II) carbonate because nickel has a +2 oxidation state in this compound. The other options are incorrect as they either misrepresent the oxidation state or the compound's composition.

What is the name of FeSO₄?

• Iron Sulfite

• Iron(II) Sulfite

• Iron(IV) Sulfate

• Iron(II) Sulfate

Answer explanation

FeSO4 is composed of iron (Fe) and sulfate (SO4). The 'II' indicates the iron is in the +2 oxidation state, making the correct name Iron(II) Sulfate, not Iron(IV) or Iron Sulfite.

Tags

NGSS.HS-PS1-2

Name Fe(NO₃)₃

• Iron(III) Nitrate

• Iron(III) Nitrite

• Iron Nitrite(III)

• Iron Nitrate

• Iron Oxynitride

Answer explanation

Fe(NO3)3 indicates iron with a +3 oxidation state, hence 'Iron(III)'. The compound is a nitrate, not nitrite, making 'Iron(III) Nitrate' the correct name. Other options are incorrect due to misidentification of the anion or oxidation state.

Tags

NGSS.HS-PS1-1

The correct name for Cu(CN)₂ is __.

• copper (I) cyanide

• carbon cyanide

• carbon carbonate

• copper (II) cyanide

• copper (I) nitride

Answer explanation

Cu(CN)2 contains copper in the +2 oxidation state, making the correct name copper (II) cyanide. The other options either misidentify the oxidation state or refer to different compounds.

Which formula/name pair is incorrect?

• FeSO₄ iron (II) sulfate

• Fe₂(SO₃)₃ iron (III) sulfite

• FeS iron (II) sulfide

• FeSO₃ iron (II) sulfite

• Fe₂(SO₄)₃ iron (III) sulfide

Answer explanation

The pair Fe₂(SO₄)₃ iron (III) sulfide is incorrect because it refers to iron (III) sulfate, not sulfide. The correct formula for iron (III) sulfide is Fe₂S₃.

In the compound CoSO₄, what is the charge on cobalt?

• +4

• +2

• +2

• -2

• -1

Answer explanation

In CoSO4, sulfate (SO4) has a charge of -2. To balance this, cobalt must have a charge of +2, making the overall charge of the compound neutral. Therefore, the charge on cobalt is +2.

What is the correct name for Ni₂(SO₄)₃

• Nickel (I) sulfide

• Nickel (II) sulfate

• Nickel (III) sulfate

• Nickel (III) sulfite

Answer explanation

Ni2(SO4)3 indicates nickel has a +3 oxidation state, making it Nickel (III) sulfate. The other options either misrepresent the oxidation state or refer to different compounds.