Multiple Choice
Which of the following is the correct chemical formula for copper(I) iodide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for copper(I) sulfide?
A
Cu2S
B
CuSO4
C
CuS
D
Cu2SO3
Verified step by step guidance1
Identify the oxidation state of copper in copper(I) sulfide. The (I) indicates copper has a +1 charge, written as Cu⁺.
Determine the charge of the sulfide ion. Sulfide (S) typically has a charge of -2, written as S²⁻.
Balance the total positive and negative charges to form a neutral compound. Since copper is +1 and sulfide is -2, you need two Cu⁺ ions to balance one S²⁻ ion.
Write the chemical formula by combining the ions in the ratio that balances the charges: two Cu⁺ ions and one S²⁻ ion gives Cu₂S.
Verify that the formula Cu₂S is neutral overall: (2 × +1) + (-2) = 0, confirming the correct formula for copper(I) sulfide.
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