Oxidation Numbers and Ionic Charges

The video tutorial explains how to find the oxidation numbers for each element in ammonium perchlorate (NH4ClO4). It begins by identifying the compound as neutral and composed of two ions: ammonium (NH4+) and perchlorate (ClO4-). The oxidation number for nitrogen in NH4+ is calculated as -3, while each hydrogen is +1. For ClO4-, the oxidation number for chlorine is determined to be +7, with each oxygen being -2. The tutorial concludes by summarizing these oxidation numbers.

What is the overall charge of ammonium perchlorate?

• Variable

• Positive

• Negative

• Neutral

What is the ionic charge of the ammonium ion?

• 2+

• 1+

• 1-

• 2-

What is the ionic charge of the perchlorate ion?

• 2+

• 1+

• 1-

• 2-

How many hydrogen atoms are present in the ammonium ion?

• 2

• 5

• 3

• 4

What is the oxidation number of nitrogen in the ammonium ion?

• +1

• -3

• 0

• +3

What is the typical oxidation number of oxygen in compounds?

• +2

• -2

• 0

• -1

How many oxygen atoms are present in the perchlorate ion?

• 5

• 4

• 3

• 2

What is the oxidation number of chlorine in the perchlorate ion?

• +5

• +6

• +7

• +8

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

• -1

• Depends on the compound

• 1

• 0

What is the oxidation number of hydrogen when bonded to nonmetals?

• -1

• 0

• +1

• +2