Multiple Choice
What is the IUPAC name for the compound CoBr2?
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3. Chemical Reactions
Naming Ionic Compounds
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the correct name for the ionic compound with the formula Cu_2S?
A
Copper(I) sulfide
B
Copper(I) sulfate
C
Copper(II) sulfide
D
Copper sulfate
Verified step by step guidance1
Identify the ions present in the compound Cu_2S. The compound consists of copper (Cu) and sulfur (S).
Determine the charge on the sulfide ion. Sulfur typically forms the sulfide ion with a charge of 2-, written as S^{2-}.
Since the formula is Cu_2S, there are two copper atoms balancing one sulfide ion. To balance the 2- charge from sulfide, the total positive charge from copper must be +2.
Divide the total positive charge by the number of copper atoms to find the charge on each copper ion: +2 total charge / 2 copper atoms = +1 charge per copper ion. This means copper is in the +1 oxidation state.
Name the compound using the oxidation state of copper in Roman numerals: Copper(I) sulfide.
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