Ox/Red Basics
Define oxidation
Loss of electrons
O in H2O
-2
What is reduction?
Gain of electrons
Where does oxidation occur?
Anode
What happens to plated objects?
gains metal
Define reduction
Gain of electrons
H in HCl?
+1
Write oxidation equation of Mg
Mg -> Mg2+ +2e-
Where does reduction occur?
Cathode
Mass change?
mass increases
What is the reducing agent?
Substance that is oxidized
S in H2SO4
+6
Write reduction reaction of Cu 2+
Cu 2+ +2e- -> Cu
Electron flow direction?
Anode to cathode
Oxidation or reduction at object?
reduction
What must change in all redox reactions?
Oxidation number changes
N in NO2?
+4
Electrons balance charge
Role of salt bridge
Allows ion flow
What happens at anode?
oxidation
Explain electron transfer in redox
Electrons transfer between substances
Cl in Cl2?
0
Equal electrons transferred
What is a voltaic cell?
spontaneous redox reaction
Explain electroplating process
metal ions reduced onto object