Multiple Choice
Which process typically leads to the formation of a salt in chemistry?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for cobalt(II) iodide?
A
CoI
B
CoI2
C
Co2I
D
Co2I3
Verified step by step guidance1
Identify the charge of the cobalt ion in cobalt(II) iodide. The Roman numeral II indicates that cobalt has a +2 charge, so the ion is Co^{2+}.
Determine the charge of the iodide ion. Iodine typically forms an ion with a -1 charge, so the iodide ion is I^{-}.
Balance the total positive and negative charges to form a neutral compound. Since cobalt has a +2 charge and iodide has a -1 charge, you need two iodide ions to balance one cobalt ion.
Write the chemical formula by combining one Co^{2+} ion with two I^{-} ions, resulting in CoI_{2}.
Verify that the formula CoI_{2} is electrically neutral by confirming that the total positive charge (+2) equals the total negative charge (2 × -1 = -2).
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