Multiple Choice
Which of the following is the correct chemical formula for aluminum nitrate?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for lead(II) bromide?
A
Pb2Br2
B
PbBr2
C
Pb2Br
D
PbBr
Verified step by step guidance1
Identify the charge on the lead ion in lead(II) bromide. The (II) indicates that lead has a +2 charge, so the ion is Pb^{2+}.
Determine the charge on the bromide ion. Bromide is a halide ion with a charge of -1, so the ion is Br^{-}.
To write the correct formula, balance the total positive and negative charges so the compound is electrically neutral.
Since Pb^{2+} has a +2 charge and Br^{-} has a -1 charge, you need two bromide ions to balance one lead ion, resulting in the formula PbBr_{2}.
Verify that the formula PbBr_{2} has a total charge of zero: (+2) + 2 (-1) = 0, confirming it is the correct chemical formula.
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