Assigning Oxidation States

Determine the oxidation number of the following element: Sulfur (S)

(a)  

Determine the oxidation number of the following element: Hydrogen (H)

(a)  

Determine the oxidation number of the following element: Phosphorus (P)

(a)  

What are the rules for assigning oxidation states?

• Sum in neutral compound = +1

• Hydrogen = -1, Oxygen = +2

• The rules for assigning oxidation states include: 1) Element in standard state = 0; 2) Monoatomic ion = charge; 3) Hydrogen = +1, Oxygen = -2; 4) Sum in neutral compound = 0; 5) Group 1 = +1, Group 2 = +2; 6) Fluorine = -1; 7) Other halogens = -1 unless exceptions.

• Element in standard state = +1

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How do you determine the oxidation state of an element in a compound?

• The oxidation state is always zero in compounds.

• The oxidation state is the same as the atomic number of the element.

• Oxidation states can only be determined through experimental data.

• The oxidation state of an element in a compound is determined by applying oxidation state rules and ensuring the sum equals the compound's charge.

What are the oxidation numbers of manganese in the manganese compounds shown below?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-1

What is the oxidation number of Nitrogen in HNO₃

• -7

• -5

• +5

• +7

• +2

Determine the oxidation number of the selected element in each ion/ compound.

• +8, -6, +5

• +2, +8, +6

• +4, +6, +5

• -4, -6, -5

• -4, -8, -6

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following statements refers to an oxidation process?

• Hydrogen is added to ethene

• Oxygen is removed from carbon dioxide

• Chlorine accepts electrons

• Increase in the oxidation number of magnesium metal

Tags

NGSS.HS-PS1-1

Determine the oxidation number of the following element: Chlorine (Cl) in NaClO

• +1

• -1

• +3

• +5