Multiple Choice
Which of the following compounds is most likely an ionic compound?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correctly named ionic compound?
A
CaSO_4: calcium sulfate
B
NaCl: sodium chloride
C
MgO: magnesium oxide
D
KBr: potassium bromide
Verified step by step guidance1
Identify the cation (positive ion) and the anion (negative ion) in each compound. For ionic compounds, the cation is usually a metal and the anion is a nonmetal or a polyatomic ion.
Recall the naming rules for ionic compounds: the cation is named first using the element name, and the anion is named second. For monatomic anions, change the ending of the element name to '-ide'. For polyatomic ions, use the standard name of the ion.
For CaSO_4, recognize that Ca^{2+} is calcium and SO_4^{2-} is the sulfate polyatomic ion. Therefore, the compound is named calcium sulfate.
For NaCl, Na^{+} is sodium and Cl^{-} is chloride (chlorine with '-ide' ending), so the compound is named sodium chloride.
For MgO, Mg^{2+} is magnesium and O^{2-} is oxide (oxygen with '-ide' ending), so the compound is named magnesium oxide. For KBr, K^{+} is potassium and Br^{-} is bromide (bromine with '-ide' ending), so the compound is named potassium bromide.
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