Quiz on Haber process
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The product of the Haber
process is ammonia
True
False
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 The
reactants needed to
make ammonia are nitrogen
and hydrogen
True
False
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 The
formula for ammonia
is NH4
True
False
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 The
reaction to make
ammonia is reversible
True
False
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 An
exothermic reaction
releases heat to its
surroundings
True
False
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The opposite of exothermic
is indothermic
True
False
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Both the forward and
reverse reaction in the
Haber process are
exothermic
True
False
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A temperature of about
200oC is chosen for the
Haber process
True
False
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A high temperature is
chosen for the Haber
process as this gives the
best yield of ammonia
True
False
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The production of ammonia
by the Haber process is
favoured by a high
pressure
True
False
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Making ammonia is an
important step in making
fertilisers
True
False
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Answer section
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with some explanation.
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answer section
The product of the Haber
process is ammonia
True
The Haber process is all about the
production of ammonia
 The
reactants needed to
make ammonia are
nitrogen and hydrogen
True
Nitrogen and hydrogen are the
reactants, in other words the starting
materials
The formula for ammonia
is NH4
False
This is the ammonium ion. The
ammonia molecule is NH3
The reaction to make
ammonia is reversible
True
This means that nitrogen reacts with
hydrogen to make ammonia AND
ammonia breaks down to make nitrogen
and hydrogen This adds complications to
the process of making ammonia on a
commercial scale !
An exothermic reaction
releases heat to its
surroundings
True
Exothermic reactions warm up their
surroundings. (This also means they
are more likely to happen when the
surroundings are cool. This idea will
be important for some later
questions)
The opposite of exothermic
is indothermic
False
The correct word is “endothermic”.
This IS the opposite of exothermic.
An endothermic reaction takes in
heat, cooling down its surroundings
Both the forward and
reverse reaction in the
Haber process are
exothermic
False
In a pair of reversible reactions, one
is ALWAYS exothermic and the other
one is ALWAYS endothermic.
A temperature of about
200oC is chosen for the
Haber process
False
The temperature is higher than this –
450oC. This seems wrong for an
exothermic reaction which give more
yield at a lower temperature. This is
explained on the next slide
A high temperature is
chosen for the Haber
process as this gives the
best yield of ammonia
False
The yield is decided by the “balance”
between the forward and reverse reactions.
This temperature is really too high to favour
the exothermic reaction but it is chosen
because it gives a good rate of reaction.
Remember : equilibrium and rate of reaction
are different ideas. Difficult but true!
The production of ammonia
by the Haber process is
favoured by a high
pressure
True
When nitrogen reacts with hydrogen, the
total number of gas particles decreases.
This means that reaction is favoured by high
pressure –(the reduction in the number of
gas particles is trying to “cancel out” the
high pressure)
Making ammonia is an
important step in making
fertilisers
True
A nice, simple question after the
trickier ones earlier -the whole point
of the Haber process is to make
useful fertlisers.
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