Redox #1

The overall charge of a polyatomic ion is

• the charge of the polyatomic ion

• the sum of the charges of its constituent atoms

• always positive

• always negative

The overall charge of a compound is

• 0

• +1

• -1

• +2

Fluorine is always

• -1

• 0

• 1

• 2

Group 2 is always

• +1

• +2

• +3

• 0

Redox Reactions

• Electrons are removed from one set of elements and transferred to another set of elements

• Only one element is oxidized while the other is reduced

• The total number of electrons remains constant

• Oxidation numbers do not change during the reaction

In every chemical reaction

• mass, energy and charge are conserved

• mass is lost and energy is gained

• charge is created and mass is conserved

• energy is destroyed and mass is conserved

Group 1 is always

• +1

• 0

• -1

• +2

Oxidation number of a diatomic =

• 0

• +1

• -1

• +2

The number of electrons lost

• Equals the number of electrons gained

• Is always greater than the number of electrons gained

• Is always less than the number of electrons gained

• Has no relation to the number of electrons gained

The oxidation number of every atom in a free element (not combined with another element in a compound) =

• 0

• +1

• -1

• +2