Multiple Choice
The silicate ion is the silicon version of the carbonate ion. Based on this description, provide the structure of the silicate ion.
5. Molecules and Compounds
Polyatomic Ions
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Give the systematic name for the following polyatomic ion.
CO22–
A
hypocarbonate
B
carbonate
C
carbonite
D
carbonide
E
carbide
Verified step by step guidance1
Identify the chemical formula given in the problem: CO2^2−.
Recognize that the formula CO2^2− represents a polyatomic ion, which is a charged species composed of two or more atoms covalently bonded.
Understand that the suffix '-ite' is typically used for polyatomic ions with one less oxygen atom than the '-ate' ion. For example, carbonate is CO3^2−, so CO2^2− would be carbonite.
Recall that the systematic naming of polyatomic ions often involves recognizing patterns in the number of oxygen atoms and the charge of the ion.
Conclude that the correct systematic name for CO2^2−, based on the pattern of naming, is 'carbonite'.
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