Unit 5 - Chemistry Notes
, INTRODUCTION TO
ELECTROCHEMISTRY
,ELECTRON TRANSFER THEORY
⦿ All reactions are a combination of 2 parts (half-reactions)
⦿ Example: 2Mg + O2 → 2MgO
Mg Mg2tt2e 202 Ze 02
Oxygen isgaining
Magnesiummustlose to electrons to
2 electronsto become become onion
anion
Reduction
Oxidation
, ⦿ Both equations are balanced by mass and by charge (the number of
electrons lost by one atom is gained by the other)
⦿ The oxygen atom has gained electrons (it is reduced and is the
oxidizing agent)
⦿ The magnesium atom has lost electrons (it is oxidized and is the
reducing agent)
, INTRODUCTION TO
ELECTROCHEMISTRY
,ELECTRON TRANSFER THEORY
⦿ All reactions are a combination of 2 parts (half-reactions)
⦿ Example: 2Mg + O2 → 2MgO
Mg Mg2tt2e 202 Ze 02
Oxygen isgaining
Magnesiummustlose to electrons to
2 electronsto become become onion
anion
Reduction
Oxidation
, ⦿ Both equations are balanced by mass and by charge (the number of
electrons lost by one atom is gained by the other)
⦿ The oxygen atom has gained electrons (it is reduced and is the
oxidizing agent)
⦿ The magnesium atom has lost electrons (it is oxidized and is the
reducing agent)
