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Quiz 5
Chapter 18
39
Chemistry
Undergraduate 1
10/09/2011

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Term
oxidized
Definition
lose electrons
Term
reduced
Definition
gain electrons
Term
Oxidation number during oxidation
Definition
increases
Term
oxidation number during reduction
Definition
decrease
Term
half reaction electrons during oxidation
Definition
electrons are products
Term
half reaction electrons during reduction
Definition
electrons as reactants
Term
oxygen during oxidation
Definition
oxygen added
Term
oxygen during reduction
Definition
oxygen lost
Term
Rule 1: oxidation state of free elements
Definition
0
Term
Rule 2: oxidation state of monatomic ions
Definition
equal to their charge
Term
Rule 3: sum of atoms oxidation states in a compound
Definition
equal zero
Term
Rule 4a: Group I metals have an oxidation state
Definition
of +1 in their compounds
Term
Rule 4b: Group II metals have an oxidation state
Definition
of +2 in their compounds
Term
Rule 5: nonmetals
Definition
nonmetals have oxidation
states according to the table, F=-1,H=+1, O=-2, group 7a=-1, group 6a=-2,group 5a=-3
Term
reducing agent
Definition
reactant that reduces an element in another reactant, contains the element that is oxidized
Term
oxidizing agent
Definition
reactant that oxidizes an element in another reactant, contains the element that is reduced
Term
Anode electrode
Definition
where oxidation occurs
loses weight
positive end of battery
attracts anions
Term
Cathode electrode
Definition
where reduction occurs
attracts cations
negative end of battery
gains weight
where plating takes place
Term
1Amp (current) = 1 Coulomb of charge =
Definition
1 A = 6.242 x 10^18 electrons per second´┐Ż
Term
1 volt
Definition
1 J per Coulomb of charge
Term
electromotive
forcel
Definition
Amount of force pushing the electrons
through the wire
Term
cell potential
Definition
difference in potential energy between the
anode and the cathode in a voltaic cell

standard emf, Eocell
Term
inert electrode
Definition
does not participate in
reaction, but just provides a surface
Term
half-reaction with a strong tendency to occur
Definition
large positive half-cell potential
Term
how electrons will flow when two half-cells are connected
Definition
half-reaction with the stronger
tendency will occurire
Term
standard hydrogen electrodels =
Definition
= 0 v
Term
stronger tendency toward
reduction than the SHE
Definition
+ value for Ered
Term
stronger tendency toward
oxidation than the SHE
Definition
- value for Ered
Term
For oxidation half-reaction
Definition
Eoxi = - Ered
Term
Ecell =
Definition
Eoxidation + Ereduction
Term
spontaneous reactionion
Definition
Free energy change
G < 1 (negative)
E > 1 (positive)
K > 1
Term
G= -RTlnKB=
Definition
=-nFEcell
Term
free energy change (G^o)=
Definition
=G + RTlnQ
Term
E =
Definition
E^o -(0.0592/n)logQ
Term
Concentration Cellsnion
Definition
Electrons will flow from the electrode in the less
concentrated solution to the electrode in the more
concentrated solution
Term
ElectrolysisTlnQ
Definition
using
electrical energy to break
a compound apartrire
Term
Corrosion
Definition
spontaneous oxidation of a metal
by chemicals in the environmentl
Term
Rust
Definition
Fe2O3*nH2O;B
Term
Rust
Definition
Fe2O3*nH2O;B
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