Multiple Choice
Which of the following is the correct chemical formula for magnesium chloride?
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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 bromide?
A
CaBr
B
CaBr2
C
Ca2Br
D
Ca2Br2
Verified step by step guidance1
Identify the charges of the ions involved: calcium (Ca) typically forms a Ca^{2+} ion, and bromine (Br) forms a Br^{-} ion.
Determine the ratio of ions needed to balance the overall charge in the compound. Since calcium has a +2 charge and bromide has a -1 charge, two bromide ions are needed to balance one calcium ion.
Write the chemical formula by combining one Ca^{2+} ion with two Br^{-} ions, resulting in CaBr_{2}.
Check that the total positive charge equals the total negative charge to ensure the compound is electrically neutral: +2 from Ca and 2 × (-1) from Br equals zero.
Confirm that the formula CaBr_{2} correctly represents calcium bromide, as it reflects the proper ionic charges and ratio.
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