Oxidation Numbers and Calcium Compounds

The video tutorial explains how to determine the oxidation numbers for each element in calcium carbide (CaC2). It starts by discussing the rule that in a neutral compound, the sum of oxidation numbers is zero. Calcium, being in group 2 of the periodic table, has a +2 oxidation number. The video then sets up an equation to find the oxidation number of carbon, resulting in -1 for each carbon atom. The tutorial concludes with a summary of the findings.

What is the oxidation number of a compound in its neutral state?

• It is equal to the number of atoms.

• It is always positive.

• It is always negative.

• It adds up to zero.

Which group in the periodic table does calcium belong to?

• Group 4

• Group 3

• Group 1

• Group 2

What is the oxidation number of calcium in CaC2?

• -1

• +2

• +1

• 0

Why do we set up an equation to find the oxidation number of carbon in CaC2?

• To verify the oxidation number of calcium.

• To confirm the oxidation number of carbon.

• To find the molecular weight of CaC2.

• To ensure the compound is neutral.

In the equation 2 + 2x = 0, what does 'x' represent?

• The oxidation number of calcium.

• The oxidation number of carbon.

• The number of carbon atoms.

• The total charge of the compound.

What is the oxidation number of each carbon atom in CaC2?

• -1

• +2

• 0

• +1

What is the final conclusion about the oxidation numbers in CaC2?

• Calcium is 0 and carbon is -2.

• Calcium is +2 and carbon is -1.

• Calcium is +1 and carbon is 0.

• Calcium is -2 and carbon is +1.