Multiple Choice
Which of the following is the correct chemical formula for barium 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 chromium(II) chloride?
A
CrCl3
B
CrCl2
C
Cr2Cl3
D
Cr2Cl2
Verified step by step guidance1
Identify the oxidation state of chromium in chromium(II) chloride. The Roman numeral II indicates that chromium has a +2 charge, written as Cr^{2+}.
Determine the charge of the chloride ion. Chloride is a halide ion with a charge of -1, written as Cl^{-}.
Balance the total positive and negative charges to form a neutral compound. Since chromium has a +2 charge and chloride has a -1 charge, you need two chloride ions to balance one chromium ion.
Write the chemical formula by combining one Cr^{2+} ion with two Cl^{-} ions, resulting in CrCl_{2}.
Verify that the total charge is zero: (+2) + 2 imes (-1) = 0, confirming that CrCl_{2} is the correct formula for chromium(II) chloride.
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