Multiple Choice
Which of the following compounds is classified as a covalent (molecular) compound?
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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 iodide?
A
AlI
B
AlI3
C
Al3I2
D
Al2I3
Verified step by step guidance1
Identify the charges of the ions involved: aluminum typically forms a +3 charge (Al^{3+}), and iodide forms a -1 charge (I^{-}).
Determine the ratio of ions needed to balance the overall charge to zero. Since aluminum has a +3 charge and iodide has a -1 charge, you need three iodide ions to balance one aluminum ion.
Write the chemical formula by combining one aluminum ion with three iodide ions, resulting in AlI_3.
Verify that the total positive charge (+3 from Al) and total negative charge (3 × -1 from I) sum to zero, confirming the formula is electrically neutral.
Compare the options given and select the formula that matches the correct ratio of aluminum to iodide ions, which is AlI_3.
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