객관식
Which statement correctly describes ionic compounds?
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3. Chemical Reactions
Naming Ionic Compounds
객관식
In which of the following is the name and formula given correctly for an ionic compound?
A
Sodium chloride, NaCl
B
Potassium sulfide, KSO4
C
Calcium nitrate, CaNO2
D
Magnesium oxide, MgO2
검증된 단계별 안내1
Step 1: Understand that ionic compounds are formed between metals and nonmetals, where the metal forms a cation and the nonmetal forms an anion. The formula must reflect the correct ratio of ions to balance the overall charge to zero.
Step 2: Analyze the given names and formulas by identifying the ions involved and their charges. For example, sodium (Na) forms a +1 cation, and chloride (Cl) forms a -1 anion, so the formula NaCl is correct because the charges balance.
Step 3: Check potassium sulfide: potassium (K) forms a +1 cation, and sulfide (S) forms a -2 anion. To balance charges, the formula should be K2S, not KSO4, which contains sulfate (SO4) and is incorrect for sulfide.
Step 4: Check calcium nitrate: calcium (Ca) forms a +2 cation, and nitrate (NO3) forms a -1 anion. The correct formula should be Ca(NO3)2 to balance charges, not CaNO2, which corresponds to nitrite, not nitrate.
Step 5: Check magnesium oxide: magnesium (Mg) forms a +2 cation, and oxide (O) forms a -2 anion. The correct formula is MgO, not MgO2, because one Mg2+ balances one O2-.
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