Electrochemetary Flashcards
what is a disproportionation reaction?
a reaction in which the same species is both oxidised and reduced
what is a spectator ion?
an ion that does not undergo a change in ox:no (oxidation Number) and is left out
what is the first rule of electrochemistry?
the OX.NO of any uncombined element is zero
what is the second rule of electrochemistry?
many atoms or ions have fixed OX.NO in compounds
what is the OX.NO for groups one, two, six, and seven?
group one = 1+
group two = 2+
Group six = 2-
Group seven = 1-
what is the oxidation number for Hydrogen?
1+ except for in metal hydrides NaH where it is -1
what is the ox.on for oxogen
2- except for in peroxides H2O2 where it is -1
what is the ox.on for florine?
-1
what is the third rule of electrochemistary?
the ox.on of an element in a monoatomic ion is always the same as the charge
what is the fourth rule of electrochemistry?
the sum of the ox.no in a compound is zero
what is the fifth rule of electrochemistry?
the sum of the ox.no in an ion is equal to the charge on the ion
what is the sixth rule of electrochemistry?
in either a compound or an ion the more electronegative element is given ox.on
explain the ox.no of F2O. take note of the sixth rule of electrochemistry.
Florine = 2(-1)
oxygen therefore must = +2
what is oxidation?
increase in ON
or
gain of oxygen
or
loss of a hydrogen
what is a redox reaction?
a reaction in which there is a transfer of electrons
what is a reduction?
the gain of electrons
true or false ON always refers to one atom in a molocule
True
