Ionic Compounds and Transition Metals

The video tutorial explains how to write the formula for Cobalt 3 oxide. It begins by identifying the element symbols for cobalt and oxygen, emphasizing the importance of recognizing cobalt as a transition metal. The tutorial discusses the charges of cobalt and oxygen, explaining how to balance them to form a neutral compound using the crisscross method. The video concludes by verifying the formula and ensuring the charges balance to zero.

What is the correct symbol for Cobalt when writing chemical formulas?

• C

• Cb

• Co

• CO

Why is it important to use a lowercase 'o' in the symbol for Cobalt?

• To represent its charge

• To show it is a transition metal

• To indicate it is a metal

• To differentiate it from carbon monoxide

What do Roman numerals indicate in the name of a transition metal compound?

• The number of atoms

• The charge of the metal

• The type of bond

• The group number

What is the ionic charge of Cobalt in Cobalt(III) oxide?

• 1+

• 4+

• 2+

• 3+

In which group is oxygen found on the periodic table?

• Group 14

• Group 15

• Group 16

• Group 17

What is the ionic charge of oxygen in compounds?

• 1-

• 4-

• 2-

• 3-

What method is used to balance the charges in Cobalt(III) oxide?

• Multiplication method

• Addition method

• Substitution method

• Crisscross method

How many oxygen atoms are needed to balance the charge of two Cobalt atoms in Cobalt(III) oxide?

• One

• Two

• Three

• Four

What is the net charge of a correctly balanced ionic compound?

• Positive

• Negative

• Zero

• Variable

What is the final formula for Cobalt(III) oxide?

• Co3O2

• CoO2

• Co2O3

• CoO