Multiple Choice
Which of the following is the correct chemical formula for the ionic compound formed between barium (Ba) and sulfur (S)?
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3. Chemical Reactions
Writing Ionic Compounds
Multiple Choice
Which of the following is the correct chemical formula for the ionic compound formed between Ca^{2+} and ClO_3^-?
A
CaClO_3
B
Ca(ClO_3)_2
C
Ca_2ClO_3
D
Ca_2(ClO_3)_3
Verified step by step guidance1
Identify the charges of the ions involved: calcium ion is Ca^{2+} and the chlorate ion is ClO_3^{-}.
Determine the ratio of ions needed to balance the overall charge of the compound so that it is electrically neutral.
Since Ca^{2+} has a charge of +2 and ClO_3^{-} has a charge of -1, two chlorate ions are needed to balance one calcium ion.
Write the chemical formula by placing the calcium ion first, followed by the chlorate ion with a subscript of 2 to indicate two chlorate ions: Ca(ClO_3)_2.
Confirm that the total positive charge (+2 from Ca^{2+}) and total negative charge (2 × -1 from two ClO_3^{-} ions) sum to zero, ensuring the compound is neutral.
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