Multiple Choice
Which of the following is the correct chemical formula for strontium nitride?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for iron(II) oxide?
A
Fe2O
B
FeO
C
Fe2O3
D
Fe3O4
Verified step by step guidance1
Identify the oxidation state of iron in iron(II) oxide. The Roman numeral II indicates that iron has a +2 charge, written as Fe^{2+}.
Recognize the oxide ion, which has a charge of -2, written as O^{2-}.
To form a neutral compound, the total positive charge must balance the total negative charge. Since Fe^{2+} and O^{2-} have charges of equal magnitude but opposite sign, they combine in a 1:1 ratio.
Write the chemical formula by combining one Fe^{2+} ion with one O^{2-} ion, resulting in FeO.
Compare this with the given options and confirm that FeO is the correct formula for iron(II) oxide.
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