Multiple Choice
Which of the following is the correct chemical formula for chromium(II) hydroxide?
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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
B
Cu_2O
C
CuO_2
D
Cu_2O_2
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, written as Cu^{2+}.
Determine the charge of the oxide ion. Oxygen typically forms an oxide ion with a charge of -2, written as O^{2-}.
Balance the charges of the copper and oxide ions 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 Cu^{2+} ion with one O^{2-} ion, resulting in CuO.
Verify that the formula CuO is electrically neutral and correctly represents copper(II) oxide.
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