Oxidation States and Calcium Compounds

This video tutorial explains the oxidation states of calcium. Initially, calcium is discussed as a free element with an oxidation number of zero. The video then explores how calcium can have different oxidation states when it bonds with other atoms, particularly focusing on its common +2 oxidation state in compounds like CaCl2. The tutorial concludes with a recap of the key points about calcium's oxidation states.

What is the oxidation number of calcium when it is in its elemental form?

• +1

• 0

• -1

• +2

Which of the following is considered a free element?

• CaCl2

• Na

• H2O

• CaO

When calcium bonds with other atoms, what is its most common oxidation state?

• -2

• +2

• 0

• +1

In the compound CaCl2, what is the oxidation state of calcium?

• +1

• +2

• -1

• 0

What is the oxidation state of chlorine in CaCl2?

• +2

• -1

• 0

• +1

In a neutral compound, what should the sum of the oxidation numbers be?

• 0

• +1

• +2

• -1

What happens to the oxidation number of calcium when it undergoes a single displacement reaction with HCl?

• It becomes -1

• It becomes +1

• It remains 0

• It becomes +2

Which group in the periodic table does calcium belong to, and what is its typical oxidation state?

• Group 2, +2

• Group 4, +4

• Group 3, +3

• Group 1, +1