Multiple Choice
Which two elements combine to form the most abundant salt found in seawater?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following chemical formulas represents the compound aluminum bromide?
A
AlBr
B
Al2Br6
C
Al2Br3
D
AlBr3
Verified step by step guidance1
Step 1: Identify the charges of the ions involved. Aluminum typically forms a +3 charge (Al^{3+}), and bromine forms a -1 charge (Br^{-}).
Step 2: Determine the ratio of aluminum ions to bromide ions needed to balance the overall charge to zero. Since aluminum is +3 and bromide is -1, you need three bromide ions to balance one aluminum ion.
Step 3: Write the chemical formula by combining one aluminum ion with three bromide ions, resulting in AlBr_3.
Step 4: Recognize that AlBr is incorrect because it does not balance the charges (Al^{3+} and Br^{-} would not be neutral in a 1:1 ratio).
Step 5: Understand that Al_2Br_6 is the dimer form of AlBr_3, often seen in the solid state, but the empirical formula representing aluminum bromide is AlBr_3.
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