Multiple Choice
Which of the following is a valid ionic compound?
3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for copper(II) oxide?
A
CuO_2
B
Cu_2O_2
C
Cu_2O
D
CuO
Verified step by step guidance1
Identify the oxidation state of copper in copper(II) oxide. The Roman numeral II indicates that copper has a +2 charge (Cu^{2+}).
Determine the charge of the oxide ion. Oxygen typically forms an oxide ion with a -2 charge (O^{2-}).
Balance the charges of the copper ion and oxide ion to form a neutral compound. Since Cu^{2+} and O^{2-} have charges of equal magnitude but opposite sign, they combine in a 1:1 ratio.
Write the chemical formula by combining one copper ion and one oxide ion, resulting in CuO.
Verify that the formula CuO is electrically neutral and correctly represents copper(II) oxide.
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