Multiple Choice
Deodorants contain a compound called aluminum hydroxide. What is its chemical formula?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for the iron(II) ion?
A
Fe^{3+}
B
Fe^{+}
C
Fe_2^{+}
D
Fe^{2+}
Verified step by step guidance1
Understand that the Roman numeral in parentheses indicates the oxidation state (charge) of the ion. Here, iron(II) means iron has a +2 charge.
Recall that the chemical symbol for iron is Fe.
Combine the symbol Fe with the charge indicated by the Roman numeral II, which corresponds to a 2+ charge.
Write the ion with the charge as a superscript: \(Fe^{2+}\).
Verify that the charge matches the oxidation state given (II means +2), confirming that \(Fe^{2+}\) is the correct formula for the iron(II) ion.
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