Cobalt and Ionic Compounds Concepts

The video tutorial explains how to write the chemical formula for Cobalt(II) Hydroxide. It begins by identifying Cobalt as a transition metal with a 2+ charge and introduces the hydroxide ion, OH-, which is a polyatomic ion with a 1- charge. The tutorial emphasizes the need to balance these charges to achieve a net charge of zero, resulting in the formula Co(OH)2. The process involves using parentheses to denote the hydroxide ion and ensuring the charges are balanced by multiplying the hydroxide's charge by two.

What is the symbol for Cobalt in the periodic table?

• Cu

• Ca

• C

• Co

What is the ionic charge of Cobalt in Cobalt(II) hydroxide?

• 0

• 1+

• 2+

• 3+

Which of the following is a polyatomic ion?

• Na+

• O2

• OH-

• H2O

What is the charge of the hydroxide ion?

• 0

• 1-

• 1+

• 2-

How do you ensure the net charge of an ionic compound is zero?

• By removing electrons

• By adding more ions

• By balancing positive and negative charges

• By changing the element

What is the correct formula for Cobalt(II) hydroxide?

• Co2(OH)

• Co2OH

• CoOH

• Co(OH)2