Cobalt Ions and Bromide Compounds

The video tutorial explains how to write the formula for Cobalt 3 Bromide. It begins by identifying the element symbols for Cobalt and Bromine, and explains the significance of the Roman numeral indicating the charge of Cobalt. The tutorial then discusses the need to balance charges between the transition metal and the non-metal, using the periodic table to determine the charge of Bromine. The formula CoBr3 is derived by balancing the charges, and the video concludes by explaining how to name the compound from its formula.

What is the element symbol for Cobalt?

• Co

• Cb

• Cl

• Cu

What charge does the bromide ion typically have?

• 1-

• 1+

• 2-

• 2+

How many bromide ions are needed to balance the charge of one Cobalt 3+ ion?

• 3

• 2

• 4

• 1

What is the correct formula for Cobalt 3 bromide?

• CoBr3

• CoBr2

• CoBr

• Co3Br

In the name Cobalt 3 bromide, what does the Roman numeral III indicate?

• The group number of Cobalt

• The number of Cobalt atoms

• The charge on the Cobalt ion

• The number of bromide ions

Why is it important to balance the charges when writing the formula for a compound?

• To make the compound magnetic

• To make the compound colorful

• To ensure the compound is stable

• To increase the compound's weight