Oxidation Numbers and Transition Metals

The video tutorial explains how to determine the oxidation numbers of elements in CuSO4. It begins by discussing the rules for oxidation numbers in neutral compounds and ions. The sulfate ion (SO4 2-) is introduced, and the process of calculating the oxidation numbers for copper and sulfur is demonstrated. The tutorial concludes with the determination of sulfur's oxidation number using algebraic methods.

What is the sum of oxidation numbers in a neutral compound?

• It is always negative.

• It is always positive.

• It is always zero.

• It equals the charge of the compound.

Which of the following is true about transition metals like copper?

• They are always positively charged.

• They can have multiple oxidation states.

• They do not participate in oxidation reactions.

• They have a fixed oxidation state.

What is the charge of the sulfate ion (SO4)?

• 3-

• 2-

• 1-

• 2+

In CuSO4, what is the oxidation number of copper?

• 0

• 3+

• 2+

• 1+

How do you determine the oxidation number of sulfur in the sulfate ion?

• By using the charge of the ion and known oxidation numbers.

• By assuming it is always -2.

• By assuming it is always +6.

• By using the atomic number of sulfur.

What is the oxidation number of sulfur in the sulfate ion?

• -2

• 0

• +6

• +4

What is the oxidation number of oxygen in most compounds?

• -1

• -2

• 0

• +1

What is the overall charge of CuSO4?

• 0

• 1-

• 1+

• 2+

Which element in CuSO4 is a transition metal?

• Oxygen

• Sulfur

• None

• Copper