Multiple Choice
Which of the following is the correct chemical formula for sodium carbonate?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following chemical formulas represents calcium carbonate?
A
CaO
B
CaCl_2
C
CaSO_4
D
CaCO_3
Verified step by step guidance1
Understand that calcium carbonate is a compound composed of calcium (Ca), carbon (C), and oxygen (O).
Recognize that the chemical formula for carbonate ion is $\mathrm{CO_3^{2-}}$, which combines with calcium ion $\mathrm{Ca^{2+}}$ to form calcium carbonate.
Analyze each given formula: $\mathrm{CaO}$ contains calcium and oxygen only, $\mathrm{CaCl_2}$ contains calcium and chlorine, and $\mathrm{CaSO_4}$ contains calcium, sulfur, and oxygen.
Identify that none of the given options explicitly show the carbonate ion $\mathrm{CO_3^{2-}}$, but the correct formula for calcium carbonate is $\mathrm{CaCO_3}$, which includes calcium, carbon, and oxygen in the correct ratio.
Conclude that the formula $\mathrm{CaCO_3}$ represents calcium carbonate, as it contains the calcium ion combined with the carbonate ion.
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