Oxidation Numbers and Compounds

The video tutorial explains how to find the oxidation numbers for each element in the compound H3PO3, also known as phosphorus acid. It begins by identifying the compound as neutral, meaning the sum of oxidation numbers equals zero. The oxidation number for hydrogen is determined to be +1, while oxygen is -2. The tutorial then calculates the oxidation number for phosphorus by setting up an equation based on these values, resulting in phosphorus having an oxidation number of +3. The video concludes by verifying the calculations and ensuring the sum of oxidation numbers equals zero.

What is the total sum of oxidation numbers in a neutral compound like H3PO3?

• It is zero.

• It is always negative.

• It is always positive.

• It varies depending on the compound.

When hydrogen is bonded to a non-metal, what is its typical oxidation number?

• 0

• +2

• -1

• +1

In which scenario does oxygen NOT have an oxidation number of -2?

• When in a neutral compound

• When bonded to peroxides

• When bonded to phosphorus

• When bonded to hydrogen

What variable is used to represent the unknown oxidation number of phosphorus in the equation?

• p

• z

• y

• x

How many oxygen atoms are present in H3PO3?

• 4

• 3

• 2

• 1

What is the oxidation number of phosphorus in H3PO3 after solving the equation?

• +4

• +3

• +2

• +1

What is the result when you multiply the subscripts and add all oxidation numbers in H3PO3?

• It equals +3.

• It equals 0.

• It equals +6.

• It equals -3.

Who is the narrator of the video tutorial?

• Dr. A

• Dr. B

• Dr. D

• Dr. C