in this video we are going to look at
the reactions of copper these will
include reactions with air water the
halogens acids and its displacement
reactions
the most common reaction of copper is
the formation of their degree there
being the french word for green on
buildings roofed with copper
this happens slowly over time as the
copper is oxidized by the oxygen in the
air
then in damp conditions this slowly
reacts to form basic copper carbonate
the power green covering you may have
seen on rooftops or even the statue of
liberty
why don't you try leaving a copper coin
or object partly in water you too will
see the same power green covering form
failing this if you have the opportunity
in a science lab you could heat copper
until it's red hot think about what
might form
now see if you can write an equation to
show this
pause the video and continue when you're
ready to check your answer
on heating copper with oxygen the result
is the formation of copper ii oxide
shown by this equation
this may seem useless but you can use
this reaction to measure the percentage
of oxygen in the air this is achieved by
passing a known volume of air over hot
copper and measuring a decrease in
volume as the oxygen reacts with it
now what about the reaction of copper
with water
think about copper's reactivity with
oxygen and its position in the
reactivity series
pause and continue when you're ready
an answer is that copper doesn't react
at all with water and so this is often
why it's used for pipes similarly this
is the case why coins are also often
made out of copper
next if you react copper with an excess
of a halogen that's fluorine chlorine or
bromine it will produce a copper halide
these halides have different colours as
shown by the equations on your screen
the next reaction we're going to
consider is how copper reacts with some
dilute and concentrated acids
there are a couple of possibilities they
include sulfuric acid and nitric acid
but copper doesn't react with
hydrochloric acid
copper will produce nitrogen oxide gas
in dilute nitric acid as shown by this
equation
whereas in concentrated nitric acid
nitrogen dioxide is produced as shown by
this equation however you should be
warned that nitrogen dioxide is toxic
finally what about when copper reacts
with concentrated sulfuric acid
can you predict what will be produced
pause the video try and write an
equation and continue when ready
the correct answer is that sulfur
dioxide is formed in the following
reaction
the sulfur dioxide produced in this
reaction is toxic so care must be taken
the last idea we're going to consider is
why cop up is often obtained in
displacement reactions
you may have guessed it's due to its low
reactivity for example any dissolved
copper salt say a copper sulfate
solution will be displaced by an
addition of any metal that is above
copper and the reactivity series
so if you were to add magnesium what do
you think would be formed pause the
video write a chemical equation and
check the answer when ready
the answer is shown here
you