Chromium Hydroxide and Ion Charges

The video tutorial explains how to name the compound CROH3, known as chromium(III) hydroxide. It begins by identifying the hydroxide ion and its role in forming ionic compounds. The tutorial then details the naming process, emphasizing the importance of recognizing chromium as a transition metal with variable charges. The video demonstrates how to calculate the charge of chromium in CROH3 and the use of Roman numerals to indicate this charge. The tutorial concludes by summarizing the naming process and reinforcing the understanding of ionic charges and compound naming conventions.

What is the name of the ion OH when it is bonded to a metal?

• Hydroxide ion

• Oxide ion

• Peroxide ion

• Hydronium ion

What type of compound is Cr(OH)3?

• Molecular compound

• Ionic compound

• Covalent compound

• Metallic compound

What is the charge of each hydroxide ion in Cr(OH)3?

• 2+

• 1+

• 1-

• 2-

How many hydroxide ions are needed to balance the charge of chromium in Cr(OH)3?

• Four

• Two

• One

• Three

What is the charge of the chromium ion in Cr(OH)3?

• 1+

• 2+

• 3+

• 4+

Why is a Roman numeral used in the name Chromium(III) Hydroxide?

• To specify the number of chromium atoms

• To denote the molecular weight

• To indicate the number of hydroxide ions

• To show the charge of the chromium ion

What does the Roman numeral III in Chromium(III) Hydroxide signify?

• The total charge of the compound

• The number of hydroxide ions

• The number of chromium atoms

• The oxidation state of chromium

If given the name Chromium(III) Hydroxide, what can you infer about the chromium ion?

• It has a 4+ charge

• It has a 1+ charge

• It has a 2+ charge

• It has a 3+ charge