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Which of the following is the correct chemical formula for the ionic compound formed between aluminum and oxygen?
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3. Chemical Reactions
Naming Ionic Compounds
Multiple Choice
Which metallic ion is present in copper(II) chloride?
A
Cl^{-}
B
Cu^{2+}
C
Cl^{2+}
D
Cu^{+}
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검증된 단계별 안내1
Identify the chemical formula given: copper(II) chloride is written as CuCl\_2.
Understand the Roman numeral in the name: the (II) in copper(II) indicates the oxidation state of the copper ion, which is +2.
Recall that chloride ions (Cl) typically have a charge of -1 each.
Since there are two chloride ions, the total negative charge is 2 \(\times\) (-1) = -2.
To balance the charges in the compound, the copper ion must have a charge of +2, so the metallic ion present is Cu^{2+}.
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