Oxidation Numbers and Iron Compounds

This video tutorial explains how to determine the oxidation number of iron in iron(III) chromate. It begins by identifying the compound as neutral, meaning all oxidation numbers sum to zero. The chromate ion is introduced with its -2 charge, and the video demonstrates how to calculate the oxidation numbers for iron to balance the compound. The tutorial also covers the correct notation for writing ions and oxidation numbers, and provides a link for further help with finding the oxidation number for chromium in chromate.

What is the overall charge of the Iron(III) Chromate compound?

• Positive

• Neutral

• Negative

• Variable

What is the ionic charge of the chromate ion (CrO4)?

• 1-

• 2+

• 3-

• 2-

How do the oxidation numbers in a chromate ion add up?

• To a positive number

• To the charge of the ion

• To a negative number

• To zero

What is the oxidation number of iron in Fe2(CrO4)3?

• +4

• +2

• +6

• +3

How many iron atoms are present in Fe2(CrO4)3?

• 1

• 2

• 3

• 4

What is the total oxidation number for the iron atoms in Fe2(CrO4)3?

• +3

• +6

• +12

• +9

In oxidation number notation, where is the sign placed?

• Before the number

• Below the number

• After the number

• Above the number

Where can you find additional help for finding the oxidation number of chromium in chromate?

• In the video description

• In the video thumbnail

• In the video comments

• In the video title