Multiple Choice
What is the correct chemical formula for aluminum sulfite?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for calcium nitride?
A
Ca2N3
B
CaN2
C
Ca3N2
D
Ca(NO3)2
Verified step by step guidance1
Step 1: Identify the ions involved. Calcium typically forms a Ca^{2+} ion, and the nitride ion is N^{3-}.
Step 2: Determine the ratio of calcium ions to nitride ions needed to balance the charges so the compound is electrically neutral.
Step 3: Use the crisscross method to balance the charges: the charge magnitude of calcium (2) becomes the subscript for nitrogen, and the charge magnitude of nitrogen (3) becomes the subscript for calcium.
Step 4: Write the chemical formula using the subscripts found: Ca_{3}N_{2}.
Step 5: Verify that the total positive charge from calcium ions equals the total negative charge from nitride ions to confirm the formula is correct.
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