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Chemistry chapter 6
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Chemistry chapter 7
Chemistry chapter 6
16 cards
Cards (34)
oxidation is gain of
oxygen
and loss of
electrons
reduction is loss of
oxygen
and gain of
electrons
Oxidation
and
reduction
always take place together
Another name for
burning
is
combusion
the term redox comes from
Reduction
+
Oxidation
if a substance loses electrons during a reaction, it has been
oxidised
Half equation
shows the electron transfer in a reaction
An
oxidation number
tells you how many electrons each atom of an element has
lost
,
gained
or
shared
, in forming a compound
the oxidation number for hydrogen is
+1
The oxidation number for sodium and the other group 1 metals is
+1
The oxidation number for calcium and the other group 2 metals is
+II
The oxidation number for aluminum, group III is
+III
The oxidation number of oxygen (except in peroxides) Group VI is
-II
The oxidation number for chlorine and the other group VII non-metals, in compounds without oxygen is
-I
An oxidising agent oxidises the
reducing
agent while it itself is
reduced
A reducing agent
reduces
the oxidising agent while it itself is oxidised
if a reducing agent is present, the strong purple colour of
potassium manganate
(
VII
) will fade
potassium iodide
is used to test for oxidising agents, the solution goes from
colourless
to
red-brown
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