Oxidation Numbers and Copper Compounds

The video tutorial explains how to determine the oxidation numbers for each element in Cu2O, known as copper(I) oxide. It highlights that Cu2O is a neutral compound, meaning the oxidation numbers must sum to zero. Copper, a transition metal, can have various oxidation states, but in this compound, it is bonded to oxygen, which typically has an oxidation state of -2. The video demonstrates that each copper atom has an oxidation state of +1, resulting in a neutral compound when combined with oxygen. The tutorial concludes by reiterating the oxidation numbers for Cu2O and the naming convention for copper(I) oxide.

What is the total sum of oxidation numbers in a neutral compound like Cu2O?

• It is always negative.

• It is zero.

• It varies depending on the compound.

• It is always positive.

Why is copper not listed in the general rules for oxidation numbers?

• Because it is a noble gas.

• Because it always has a fixed oxidation state.

• Because it is a transition metal with variable oxidation states.

• Because it is a non-metal.

What is the typical oxidation state of oxygen in compounds?

• -2

• -1

• +2

• 0

In Cu2O, what is the oxidation number of each copper atom?

• -1

• +1

• +2

• 0

How do the oxidation numbers of copper and oxygen in Cu2O balance each other?

• Copper is +2 and oxygen is -2, balancing to zero.

• Copper is 0 and oxygen is 0, balancing to zero.

• Copper is +1 and oxygen is -2, balancing to zero.

• Copper is -1 and oxygen is +2, balancing to zero.

What is the correct name for Cu2O based on its oxidation state?

• Copper(II) Oxide

• Copper(I) Oxide

• Copper Oxide

• Copper(III) Oxide

Why is Cu2O referred to as Copper(I) Oxide?

• Because it contains one copper atom.

• Because each copper atom has an oxidation number of +2.

• Because each copper atom has an oxidation number of +1.

• Because it is a neutral compound.