Multiple Choice
Which of the following is the correct chemical formula for aluminum selenide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for ammonium sulfide?
A
NH4S
B
NH4SO3
C
(NH4)2S
D
(NH4)2SO4
Verified step by step guidance1
Identify the ions involved: ammonium is the polyatomic ion NH4\textsuperscript{+} and sulfide is the ion S\textsuperscript{2-}.
Determine the charges of each ion: ammonium has a charge of +1, and sulfide has a charge of -2.
Balance the total positive and negative charges to make a neutral compound. Since sulfide has a charge of -2, you need two ammonium ions (each +1) to balance it.
Write the formula by placing the ammonium ion in parentheses with a subscript 2 to indicate two ammonium ions, followed by the sulfide ion: (NH4)2S.
Verify that the formula is neutral by checking that the total positive charge (+2 from two NH4\textsuperscript{+}) balances the total negative charge (-2 from one S\textsuperscript{2-}).
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