Multiple Choice
Which of the following is the correct chemical formula for calcium 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) fluoride?
A
CrF2
B
CrF3
C
Cr2F2
D
Cr2F3
Verified step by step guidance1
Identify the oxidation state of chromium in chromium(II) fluoride. The Roman numeral II indicates that chromium has a +2 charge, so the chromium ion is \( \text{Cr}^{2+} \).
Determine the charge of the fluoride ion. Fluoride is a halide ion with a charge of \( -1 \), so the fluoride ion is \( \text{F}^{-} \).
Balance the total positive and negative charges to form a neutral compound. Since chromium has a +2 charge and fluoride has a -1 charge, you need two fluoride ions to balance one chromium ion.
Write the chemical formula by combining one \( \text{Cr}^{2+} \) ion with two \( \text{F}^{-} \) ions, resulting in \( \text{CrF}_2 \).
Verify that the formula \( \text{CrF}_2 \) is electrically neutral by confirming the total positive charge (+2) equals the total negative charge (2 × -1 = -2).
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