Multiple Choice
Which of the following is the correct chemical formula for zinc iodide?
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3. Chemical Reactions
Writing Ionic Compounds
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Which of the following is the correct formula for the compound formed by lead(II) ions and chromate ions?
A
Pb(CrO4)2
B
Pb2CrO4
C
PbCrO4
D
Pb2(CrO4)3
Verified step by step guidance1
Identify the charges of the ions involved: lead(II) ion is Pb^{2+} and chromate ion is CrO_4^{2-}.
Write down the charges explicitly: Pb^{2+} and CrO_4^{2-}.
Determine the ratio of ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Since Pb^{2+} and CrO_4^{2-} both have charges of magnitude 2 but opposite signs, one Pb^{2+} ion will balance with one CrO_4^{2-} ion.
Write the formula by combining one Pb^{2+} ion and one CrO_4^{2-} ion without any additional subscripts, resulting in PbCrO_4.
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