Electrochemistry Flashcards

Flashcards about oxidation numbers and redox reactions

Oxidation Number of Element

Zero (0). Ex: diatomic elements, C, Ag, Na

Oxidation Number of Monoatomic Ion

Equal to the charge. Ex: Na+, Fe2+

Oxidation Number of Fluorine (F)

Always -1

Oxidation Number of Oxygen (O)

-2, unless in a peroxide, then -1

Oxidation Number of Hydrogen (H)

+1, unless in a metal hydride, then -1

Reduction

Oxidation number gets smaller (less positive/more negative). Ex: 0 → -2, +3 → 0

Oxidation

Oxidation number gets bigger (more positive/less negative). Ex: +2 → +3, 0 → +2

Redox Reaction

No change in oxidation numbers of the species

Reducing Agent

The species that is oxidized, donating electrons (e- on product side)

Oxidizing Agent

The species that is reduced, accepting electrons (e- on reactant side)

Anode

Site of oxidation (vowels match)

Cathode

Site of Reduction (consonants match)

Galvanic Cell

Has a positive Ecell

Electrolytic Cell

Has a negative Ecell

OIL RIG

Oxidation Is Losing (electrons); Reduction Is Gaining (electrons)

LEO GER

Losing Electrons is Oxidation; Gaining Electrons is Reduction