Chemistry Regents Review: Redox & Unit 5.3 (week #10)

spontaneous

on its own

Voltanic Cell

chemical energy → electrical energy

reduction

chemical process where a substance gains e-

• electrode mass increases

oxidation

chemical process where a substance loses an e-

• electrode mass decreases

reduction and oxidation always occur together because of the….

Law of Conservation of mass

LEO the lion says GER

• LEO - lose e- oxidize

• GER - gain e- redox

the more active metal… (VC)

will oxidize first

less active metal… (VC)

will redox spontaneously

Redox Half Reaction example

Al3+ + 3e- → Al

Oxidization Half Reaction Example

Mg → Mg2+ + 2e-

Free Element

a chemical element that is chemically combined w/ any other element

anode

electrode for oxidization

cathode

electrode for reduction

An Ox & Red Cat

• Anode Oxidize

• Redox Cathode

Salt bridge

balences charge because allows ions to flow through it

e- flow from ________ to _________ through the _________.

Anode to Cathode through the wire

Electrolytic Cells

eletrical energy to chemical energy (NOT SPONTANEOUS)

• charges of anode and cathode are switched

  • anode positive and cathode negative

Free Elements and Compounds have an oxidization number…

0 because neutral

H always +1 unless bonded w/ a metal, so it becomes

-1

O always -2 unless combined w/ ______ & ________.

• F (OF2) → +2

• peroxides (H2O2) → -1

Oxidizing Agent

get reduced

Reducing Agent

gets oxidized

Redox Reaction

oxidization # changes