Multiple Choice
Which of the following is the correct chemical formula for strontium sulfate?
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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) hydroxide?
A
Cu2(OH)2
B
Cu(OH)2
C
Cu2OH
D
CuOH
Verified step by step guidance1
Identify the charge on the copper ion in copper(II) hydroxide. The (II) indicates copper has a +2 charge, so the ion is Cu^{2+}.
Recognize the hydroxide ion, OH^{-}, which has a charge of -1.
To form a neutral compound, balance the total positive and negative charges. Since Cu^{2+} has a +2 charge, you need two OH^{-} ions to balance it out, each with a -1 charge.
Write the chemical formula by combining one Cu^{2+} ion with two OH^{-} ions, resulting in Cu(OH)_2.
Verify that the formula is electrically neutral: +2 from copper and 2 × (-1) from hydroxide equals zero net charge.
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