Oxidation Numbers in Compounds

The video tutorial explains how to determine the oxidation numbers in water, highlighting that water is a neutral compound with a total oxidation number of zero. It details the oxidation numbers of hydrogen and oxygen in water, noting that hydrogen is +1 and oxygen is -2. The tutorial also covers exceptions to these rules, such as in H2O2 and other peroxides where oxygen is -1, and in OF2 where oxygen is +2 due to fluorine's high electronegativity.

What is the oxidation number of water (H2O) as a whole?

• +1

• -2

• 0

• +2

In a water molecule, what is the oxidation number of hydrogen?

• -1

• +2

• 0

• +1

What is the oxidation number of oxygen in a water molecule?

• -1

• -2

• +1

• 0

What is the usual oxidation number of oxygen in compounds?

• 0

• -2

• -1

• +2

In peroxides like H2O2, what is the oxidation number of oxygen?

• 0

• -1

• +1

• -2

Why does oxygen have an oxidation number of -1 in peroxides?

• Because hydrogen is -1

• Because oxygen is more electronegative

• To balance hydrogen's +1 oxidation number

• Because oxygen is less electronegative

In OF2, what is the oxidation number of oxygen?

• 0

• +2

• -2

• -1

Why does oxygen have a positive oxidation number in OF2?

• Because fluorine is less electronegative

• Because fluorine is more electronegative

• Because oxygen is more electronegative

• To balance the molecule's charge

Which element always has an oxidation number of -1 in compounds?

• Oxygen

• Hydrogen

• Fluorine

• Nitrogen