Chromium-3 Hydroxide and Ionic Charges

This video tutorial explains how to write the chemical formula for Chromium(III) Hydroxide. It begins by identifying the element symbol for Chromium and its ionic charge, followed by the hydroxide ion's charge. The tutorial emphasizes the importance of balancing the charges to achieve a net charge of zero. It concludes with the correct formula representation, including the use of parentheses to denote multiple hydroxide ions.

What is the main objective of the video?

• To learn about the periodic table

• To memorize chemical symbols

• To understand ionic charges

• To write the formula for Chromium-3 Hydroxide

What is the element symbol for Chromium?

• Co

• Cm

• Cr

• Ch

What does the Roman numeral III indicate in Chromium-3?

• The number of electrons

• The number of neutrons

• The ionic charge of 3+

• The atomic number

What is the charge of the hydroxide ion?

• 2-

• 1-

• 1+

• 2+

Why do we need to balance the charges in Chromium-3 Hydroxide?

• To make it a gas

• To ensure a net charge of zero

• To increase its solubility

• To change its color

How many hydroxide ions are needed to balance the charge of Chromium-3?

• Three

• Two

• Four

• One

What is the correct formula for Chromium-3 Hydroxide?

• Cr(OH)3

• CrO3H

• CrOH

• Cr(OH)2