Determine the name of each compound

Determine the name of each compound. Use Roman numerals where needed. Spelling counts. CuO: Copper(II) Oxide Cu?O: Copper(I) Oxide CoS: Co?S3:

The Correct Answer and Explanation is:

Here are the correct names for the compounds:

CoS: Cobalt(II) Sulfide

Co₂S₃: Cobalt(III) Sulfide

Explanation of Chemical Nomenclature

The process of naming chemical compounds follows a systematic set of rules to ensure clarity and avoid ambiguity. The compounds shown are binary ionic compounds, which consist of a metal cation and a nonmetal anion. For transition metals like cobalt, which can form ions with different positive charges, Roman numerals are used to specify the charge of the metal ion in the compound.[1][2][3]

Here is a step-by-step breakdown of how to name each compound:

CuO: Copper(II) Oxide

Identify the elements: Cu is copper, and O is oxygen.
Determine the charge of the anion: Oxygen is in Group 16 of the periodic table and typically forms an anion with a 2- charge (O²⁻), called oxide.
Determine the charge of the cation: Since the compound is neutral, the total positive charge must balance the total negative charge. With one oxide ion (2-), the single copper ion must have a 2+ charge to balance it.
Write the name: The name of the metal is followed by the charge in Roman numerals in parentheses, and then the name of the nonmetal with its ending changed to “-ide”. Thus, CuO is Copper(II) Oxide.

Cu₂O: Copper(I) Oxide

Identify the elements: Cu is copper, and O is oxygen.
Determine the charge of the anion: The oxide ion has a 2- charge.
Determine the charge of the cation: There are two copper ions for one oxide ion. To balance the 2- charge of the oxide, each copper ion must have a 1+ charge (2 * 1+ = 2+).
Write the name: Following the naming convention, Cu₂O is Copper(I) Oxide.

CoS: Cobalt(II) Sulfide

Identify the elements: Co is cobalt, and S is sulfur.
Determine the charge of the anion: Sulfur is in the same group as oxygen and forms an anion with a 2- charge (S²⁻), called sulfide.[4]
Determine the charge of the cation: To balance the 2- charge of the single sulfide ion, the single cobalt ion must have a 2+ charge.[5][6]
Write the name: The name is Cobalt(II) Sulfide.[5]

Co₂S₃: Cobalt(III) Sulfide

Identify the elements: Co is cobalt, and S is sulfur.
Determine the charge of the anion: The sulfide ion has a 2- charge. There are three sulfide ions, making the total negative charge 3 * 2- = 6-.[7]
Determine the charge of the cation: There are two cobalt ions to balance the total 6- charge. Therefore, each cobalt ion must have a 3+ charge (2 * 3+ = 6+).[7][8]
Write the name: The name is Cobalt(III) Sulfide.[8][9]

This systematic approach, particularly the use of Roman numerals for transition metals, is crucial in chemistry for distinguishing between different compounds made from the same elements.

Sources help

Explanation of Chemical Nomenclature

Related Posts