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GCSE chemistry
Paper 1
Chemical Changes
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Cards (83)
Are all
metals
found in the ground as
ores
?
No
Are
metals
below
carbon
in the
reactivity series
, extracted by
reduction
using carbon?
Yes
Iron reacts with oxygen to form iron oxide. What kind of reaction is this?
Oxidation
What is the difference between the concentration of hydrogen ions between two solutions of pH2 and pH3?
The solution with a pH of 2 has more hydrogen ions than the solution with a pH of 3 by a factor of
10.
Do hydroxide ions make solutions acidic?
No
How can a solid be obtained from a salt solution
By
crystallisation
of the salt solution
Name the 2 products formed in the reaction between
hydrochloric acid
and
copper oxide
Copper Chloride
Water
An electrolysis cell has two electrodes. What is the name of the positive electrode?
Anode
An electrolysis cell has two electrodes. What is the name of the negative electrode?
Cathode
In electrolysis, which direction do the electrons travel?
From the
anode
to the
cathode
Electrolyte
What is the name of the liquid indicated by the letter A on the diagram?
Which ions are attracted to the negative electrode (cathode) during electrolysis?
Positive
ions
Which ions are attracted to the positive electrode (anode) during electrolysis?
Negative
ions
What are the electrodes in an electrolysis cell are normally made of?
Inert carbon
Electrodes in an electrolysis cell are normally made of inert carbon. What does inert mean?
It is
unreactive
so it will not take place in the reaction.
In electrolysis, is the ion that gains electrons oxidised or reduced?
Reduced
In electrolysis, is the ion that loses electrons oxidised or reduced?
Oxidised
In the electrolysis of molten lead bromide, what is the product at the anode?
Bromine
What is oxidisation?
Loss of electrons.
What is reduction?
Gain of electrons.
In electrolysis, why does the compound you are trying to separate need to be molten or dissolved?
So that the
ions
are
free to move
Cathode
What is the name of the object indicated by the letter B?
Anode
What is the name of the object indicated by the letter E?
In electrolysis, which electrode would chloride ions (Cl-) be attracted to?
Anode
What chemical processes are used to extract metals from their ores?
Electrolysis
and
reduction by carbon
How is a metal extracted from a metal compound using electrolysis?
A compound is
split
into its
elements
using
electricity
Why is electrolysis not used to extract all metals?
Electrolysis is
expensive
because it requires a
large
amount of
electricity
When should a metal be extracted by carbon reduction?
When the metal is
less
reactive than carbon
Which method of metal extraction would be used to extract potassium?
Electrolysis
Which method of metal extraction would be used to extract calcium?
Electrolysis
Which method of metal extraction would be used to extract magnesium?
Electrolysis
Which method of metal extraction would be used to extract aluminium?
Electrolysis
Which method of metal extraction would be used to extract zinc?
Reduction by carbon
Which method of metal extraction would be used to extract iron?
Reduction by carbon
Which method of metal extraction would be used to extract tin?
Reduction by carbon
Which method of metal extraction would be used to extract lead?
Reduction by carbon
Which method of metal extraction would be used to extract copper?
It is found native.
Which method of metal extraction would be used to extract gold?
It is found native.
Which method of metal extraction would be used to extract silver?
It is found native.
List the reactivity series from most reactive to least:
Potassium
Sodium
Calcium
Magnesium
Aluminium
Carbon
Zinc
Iron
Tin
Lead
Hydrogen
Copper
Silver
Gold
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