Unit 4 oxidation states

Which of these is higher than the others on the list of oxidation number rules?

• In a neutral compound all oxidation numbers must add up to zero.

• Free elements have an oxidation number of zero (e.g. Na, Fe, H2, O2, S8, etc.).

• Group 1 = +1 Group 2 = +2

• Group 17 (7A) = -1 Group 16 (6A) = -2 Group 15 (5A) = -3

Which of these is higher than the others on the list of oxidation number rules?

• In an ion all the oxidation numbers must add up to the net charge of the ion.

• Hydrogen with nonmetals = +1 Hydrogen with metals or boron = -1

• Oxygen = -2 (except with fluorine or peroxides like H2O2)

• Free elements have an oxidation number of zero (e.g. Na, Fe, H2, O2, S8, etc.).

Which of these is higher than the others on the list of oxidation number rules?

• Fluorine = -1

• Oxygen = -2 (except with fluorine or peroxides like H2O2)

• Hydrogen with nonmetals = +1

• Group 16 (6A) = -2

What is the oxidation number of carbon in carbon dioxide CO₂?

• -1

• -2

• -4

• +4

• +2

What is the oxidation number of nitrogen in nitrogen trichloride NCl₃?

• -3

• +1

• -1

• +3

• +2

Tags

NGSS.HS-PS1-2

What is the oxidation number of fluorine in carbon tetrafluoride CF₄?

• -2

• -1

• -3

• +2

• +1

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the oxidation number of phosphorus in phosphorus tetroxide ion [PO₄]^3-?

• 0

• +2

• +3

• -4

• +5

Tags

NGSS.HS-PS1-2

What is the oxidation number of oxygen in phosphorus tetroxide ion [PO₄]^3-?

• 0

• -2

• -3

• +2

• +3

Tags

NGSS.HS-PS1-2

What is the oxidation number for sulfur in octasulfur S₈?

• 0

• +1

• -1

• -2

• +2

What is the oxidation number for oxygen in dilithium dioxide Li₂O₂?

• 0

• +2

• -2

• +1

• -1