Chem Quiz Study Guide
In which process does the nitrogen undergo oxidation?
(A) N2 --> 2NH3
(B) N2O4 --> 2NO2
(C) 2NO3– --> N2O5
(D) NO2– --> NO3–
Which equation represents an oxidation-reduction
reaction?
(A) H2SO4 + 2NH3→ (NH4)2SO4
(B) H2SO4 + Na2CO3→ Na2SO4 + H2O + CO2
(C) 2K2CrO4 + H2SO4→ K2Cr2O7 + K2SO4 + H2O
(D) 2H2SO4 + Cu → CuSO4 + 2H2O + SO2
is the lab due wed? ←-yesh o’rly
To Find Oxidation Number:
- Pure element in standard state- has an oxidation of 0
- Oxygen in a compound is usually -2, unless it’s in H2O2 or N2O2 Then, O is -1. OF2 : O=2+
- H is always +1, unless it’s in a metal hydride (ex: LiH). Then it’s -1.
- Group 1 is always +1
- The sum of the oxidation #s in a compound is 0.
- The sum of ox #s in a polyatomic ion is = to charge of the ion
- Ions always have an ox # = to its charge
- F is always -1
Oxidation and Reduction:
Leo Goes Ger- Losing Electrons Oxidation goes Gaining Electrons Reduction
Voltaic cell
- spontaneous
- Produces electric current
- has salt bridge
- Uses a chemical reaction to produce electricity
Electrolytic cell
- nonspontaneous
- Uses applied electric current
- has a power source (ex. battery)
- Produces a chemical reaction with the use of electricity
http://www.youtube.com/watch?v=-bxJXt_69yM ←- remember this song, its very important and quite catchy not really
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