Multiple Choice
Which of the following is the correct chemical formula for the ionic compound formed between lithium and sulfur?
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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) nitrite?
A
Cr(NO_3)_2
B
Cr_2(NO_2)_3
C
Cr(NO_2)_2
D
Cr_2(NO_3)_2
Verified step by step guidance1
Identify the oxidation state of chromium in chromium(II) nitrite. The (II) indicates chromium has a +2 charge, so Cr is Cr^{2+}.
Determine the formula and charge of the nitrite ion. Nitrite is NO_2^{-} with a charge of -1.
Balance the total positive and negative charges to form a neutral compound. Since Cr^{2+} has a +2 charge and NO_2^{-} has a -1 charge, two nitrite ions are needed to balance one chromium ion.
Write the chemical formula by combining one Cr^{2+} ion with two NO_2^{-} ions, resulting in Cr(NO_2)_2.
Verify that the formula is neutral by confirming the total positive charge (+2) equals the total negative charge (2 × -1 = -2).
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