Oxidation Numbers in Compounds

The video tutorial explains how to determine oxidation numbers for elements in various compounds. It begins with general rules and progresses through examples, including nitrogen oxide, dinitrogen monoxide, nitrate ion, chlorine trifluoride, hydrogen peroxide, cyanide ion, and ethanol. The tutorial emphasizes using known oxidation numbers to deduce unknowns, handling conflicts in rules, and special cases like ions and peroxides.

What is the oxidation number of nitrogen in nitrogen oxide (NO)?

• +1

• +2

• 0

• -2

In a neutral compound, what should the sum of all oxidation numbers be?

• +2

• -1

• 0

• +1

For the nitrate ion (NO3-), what is the oxidation number of nitrogen?

• -5

• +5

• -3

• +3

What is the oxidation number of oxygen in O2 gas?

• -2

• 0

• +1

• +2

In chlorine trifluoride (ClF3), what is the oxidation number of chlorine?

• +3

• -1

• +1

• 0

What is the oxidation number of manganese in the permanganate ion (MnO4-)?

• +7

• +2

• +4

• +6

In hydrogen peroxide (H2O2), what is the oxidation number of oxygen?

• +1

• -2

• -1

• 0

For the cyanide ion (CN-), what is the oxidation number of carbon?

• +2

• -2

• +4

• 0

In ethanol (C2H5OH), what is the oxidation number of the carbon atom bonded to three hydrogens?

• 0

• +3

• -3

• +1

Why do different carbon atoms in ethanol have different oxidation numbers?

• Because they are bonded to different elements

• Because they are in different groups

• Because they are in different periods

• Because they have different charges