Multiple Choice
What is the correct name for the compound LiOH?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for aluminum sulfide?
A
Al3S2
B
AlS3
C
AlS
D
Al2S3
Verified step by step guidance1
Identify the charges of the ions involved: aluminum typically forms a +3 charge (Al^{3+}), and sulfide forms a -2 charge (S^{2-}).
Determine the ratio of aluminum ions to sulfide ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Use the crisscross method to balance the charges: the charge magnitude of aluminum (3) becomes the subscript for sulfur, and the charge magnitude of sulfur (2) becomes the subscript for aluminum.
Write the chemical formula using the subscripts found: Al_{2}S_{3}, indicating 2 aluminum atoms and 3 sulfur atoms per formula unit.
Verify that the total positive charge (2 × +3 = +6) balances the total negative charge (3 × -2 = -6), confirming the formula is electrically neutral.
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