Multiple Choice
What is the correct name for the ionic compound CaO?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct chemical formula for aluminum bromide?
A
Al2Br3
B
AlBr3
C
AlBr
D
Al3Br2
Verified step by step guidance1
Identify the charges of the ions involved: aluminum typically forms a +3 charge (Al^{3+}), and bromide forms a -1 charge (Br^{-}).
Determine the ratio of ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Since aluminum has a +3 charge and bromide has a -1 charge, you need three bromide ions to balance one aluminum ion.
Write the chemical formula by placing the aluminum symbol first, followed by the bromide symbol with the appropriate subscript to indicate the number of bromide ions.
The resulting formula is AlBr_{3}, which reflects one aluminum ion combined with three bromide ions to form a neutral compound.
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