Multiple Choice
When magnesium reacts with chlorine, which ionic compound is formed?
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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 carbonate?
A
Ca_3(CO_3)_2
B
Ca_2CO_3
C
CaCO_3
D
Ca(CO_2)_3
Verified step by step guidance1
Identify the ions involved in calcium carbonate: calcium ion (Ca^{2+}) and carbonate ion (CO_3^{2-}).
Determine the charges of each ion: calcium ion has a charge of +2, and carbonate ion has a charge of -2.
Balance the charges so that the total positive charge equals the total negative charge, resulting in a neutral compound.
Since both ions have charges of magnitude 2 but opposite signs, they combine in a 1:1 ratio to form CaCO_3.
Verify the formula by checking that the total charge sums to zero: (+2) + (-2) = 0, confirming CaCO_3 is the correct formula.
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