TYCES – Year 10 Chemistry
Summer Work 2023
Aims:
1) To test knowledge of reversible reactions and
equilibrium.
2) To learn about REDOX reactions using prior knowledge
from electrolysis and formula.
3) To test knowledge of REDOX reactions
4) Develop research and revision skills.
Equilibrium Past Paper Questions
Forward
The rates
reaction
are
and backward reaction are
The equilibrium yields of SO2
increase.
happening
Equilibrium
moves to the
left
and
O2
hand side in the
endothermic
directionteam isson increases.
Equilibrium
moves to the
the
fewest gaseous
atthe
the same and concentration constant. Same time
right
molecules to
hand side to the side with
oppose
the
change.
!
The
Equilibrium
direction
to
equilibrium yield of NHS
moves to the
right hand side
in
increases.
the exothermic
oppee the change.
The equilibrium
Equilibrium
moves to the
highest gaseous
molecules
left
to
yields of N2
hand side
oppose the
and
He increases.
to the side
change
-
with
-
-
a
substance that increases the rate
but
itself
remains
unchanged
of
a
at the end
chemical reaction
of the
reaction.
decreases
decreases
decreases.
decreases.
IGCSE REDOX Notes
● Oxidation is gain of oxygen
● Reduction is loss of oxygen
● Roman numerals are used after an element in the name of a
compound to refer to its oxidation state – normally used in
reference to metals showing what + charge they have
o E.g.,iron (II) is Fe , iron (III) is Fe , copper (II) is Cu ,
manganate (VII) is Mn etc...
2+
3+
7+
(Extended only) Define redox in terms of electron transfer
● Oxidation Is Loss (of electrons)
● Reduction Is Gain (of electrons)
2+
A redox reaction is one where both oxidation and reduction
take place.
If an element is gaining electrons and another is losing
electrons, then the reaction is a redox reaction (or
losing/gaining oxygen)
Potassium manganate (VII):
o Deep purple and when reduced, it becomes colourless
o E.g., react with iron (II) chloride and colourless Mn ions
are formed
o E.g., react with sulphur dioxide and the same thing happens.
o This is because, potassium manganate (VII) is an oxidising
agent and therefore is reduced itself.
2+
REDOX past paper questions:
A.
B
A
D
D
-
A
C
A
I
B
-
A
C
A
B
A
A
C
R
D
D
A