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Give the systematic IUPAC name for the compound FeCl3.
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for aluminum dichromate?
A
Al2Cr2O7
B
Al(Cr2O7)2
C
Al2(Cr2O7)3
D
Al(CrO4)3
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Identify the ions involved: aluminum ion is Al³⁺ and the dichromate ion is Cr₂O₇²⁻.
Determine the charges of each ion: Al³⁺ has a charge of +3, and Cr₂O₇²⁻ has a charge of -2.
Balance the total positive and negative charges to make the compound neutral. Find the smallest common multiple of 3 and 2, which is 6.
Calculate the number of each ion needed to reach a total charge of zero: 2 aluminum ions (2 × +3 = +6) and 3 dichromate ions (3 × -2 = -6).
Write the chemical formula by placing the number of ions as subscripts: Al₂(Cr₂O₇)₃.
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