Multiple Choice
Which of the following is the correct chemical formula for zinc iodide?
16
views
3. Chemical Reactions
Writing Ionic Compounds
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
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.
3:09mWatch next
Master Rules for Writing Ionic Compounds with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Writing Ionic Compounds practice set
Problem sets built by lead tutorsExpert video explanations