Summary - Unit 3 - Redox I

REDOX I
REDOX -



when reduction and Oxidation happens simultaneously

OXIDATION NUMBER -




hypothetical charge of an atom if all of its bonds to oth


DISPROPORTIONATION -

an element in a single species being simultaneously oxidise


S-block metal-oxidise to form trive ions ↑ oxidation .
no


form-tiveions boxidation .
no
p-block metal-reduce to




#
OXIDISING AnGENT-gains electrons


REDUCING AGENT - loses elections




GROUP 1/2 +




Oxidation Reduction ALUMINIUM

FLOURINE
Is Is
#




Loss of - Gain of e- CHLORINE -




BALANCING HALF-EQUATIONS




BALANCING HALF-EQUATIONS :
ACIDIC SOLUTIONS
e .



. MeOz and
g MnOy- react in al
1) break into half equations

2) balance all other elements except O and
I

3) balance O by adding H20 2420 +
MnO2
+
4) balance H H e
by adding +
MnQ
J
ensure e- are on opposite
5) balance with e-
charges sides of
ISO2-
-
ensure to remember

6) multiplication + 2 Mot
balance e-between equations with to
simplify
7) Write as one equation

24 20 + Mn0z + 2 Mn0

BALANCING HALF-EQUATIONS :

BASIC SOLUTIONS + 4 OH


1) work out the acidic answer
4 Or + 220 + MeOz + 2 MnO

2) add as OH-to both sides A+
many as there is
4 On MnOz 2 Mn
-




+ +

3) cancel out the H20 formed