Multiple Choice
Which of the following is the correct name for the ionic compound SiO_2?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following ionic compounds is commonly used as a building material?
A
CaCO_3 (limestone)
B
MgO (magnesium oxide)
C
NaCl (salt)
D
Fe_2O_3 (iron oxide)
Verified step by step guidance1
Understand the question: It asks which ionic compound is commonly used as a building material. This means we need to identify a compound known for its structural or construction applications.
Review each compound's common uses:
- $\mathrm{CaCO_3}$ (calcium carbonate) is found in limestone, which is widely used in construction.
- $\mathrm{MgO}$ (magnesium oxide) is used in refractory materials but less commonly as a primary building material.
- $\mathrm{NaCl}$ (sodium chloride) is common table salt, not used in building.
- $\mathrm{Fe_2O_3}$ (iron oxide) is rust, which is not a building material itself but related to iron corrosion.
Focus on $\mathrm{CaCO_3}$: Limestone, primarily composed of calcium carbonate, is a natural stone used extensively in building due to its durability and availability.
Compare with other options: While $\mathrm{MgO}$ and $\mathrm{Fe_2O_3}$ have industrial uses, they are not typically classified as building materials in the same way limestone is.
Conclude that $\mathrm{CaCO_3}$ (limestone) is the correct answer because it is the ionic compound commonly used as a building material.
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