Multiple Choice
Which of the following is the correct chemical formula for calcium bromide?
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3. Chemical Reactions
Writing Ionic Compounds
Multiple Choice
Which of the following is the correct formula for an ionic compound formed between Ba^{2+} ions and Cl^{-} ions?
A
BaCl_2
B
Ba_2Cl_2
C
Ba_2Cl
D
BaCl
Verified step by step guidance1
Identify the charges of the ions involved: Ba^{2+} has a charge of +2, and Cl^{-} has a charge of -1.
Determine the ratio of ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Since Ba^{2+} has a +2 charge, and each Cl^{-} has a -1 charge, two Cl^{-} ions are needed to balance one Ba^{2+} ion.
Write the formula by placing the cation first followed by the anion, using subscripts to indicate the number of each ion: \(\mathrm{BaCl_2}\).
Verify that the total positive charge equals the total negative charge: \(+2\) from Ba^{2+} and \(2 \times (-1) = -2\) from two Cl^{-} ions, confirming the compound is neutral.
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