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Slide 1

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Reversible Reactions and
Equilibrium…read more

Slide 2

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Irreversible reactions
· Most Chemical reactions are considered irreversible in
that products are not readily changed back into
· When magnesium reacts with
Mg + 2HCl
acid it is not easy to unreact it MgCl2 + H2
and get back the magnesium.
· When wood burns it is pretty reacting
difficult to un-burn it back into with
wood again!…read more

Slide 3

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Irreversible reactions
· Although most chemical reactions are difficult to
reverse it is possible to find reactions ranging from
irreversible to the fully reversible.
· Indeed many of the Many biochemical reactions are
biochemical reactions that take reversible
place in living things are
· There are also some very
important industrial reactions,
like the Haber Process, that
are reversible.…read more

Slide 4

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Simple reversible reactions
Heating copper sulphate
· The change from blue hydrated copper sulphate to
white anhydrous copper sulphate is one of the most
commonly known reversible reactions.
hydrated copper anhydrous copper
sulphate steam
CuSO4.5H20 CuSO4 + 5H2O…read more

Slide 5

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Simple reversible reactions
Heating ammonium chloride
Ammonium salts are made by reacting ammonia with an
acid but some of these salts will decompose back into
reactants when heated.
Heat makes the solid
disappear as it
changes into gases. Solid reappears as it
changes back again
in the cool part of
the tube.
ammonium ammonia hydrogen
chloride chloride
NH4Cl(s) NH3(g) + HCl(g)…read more

Slide 6

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Dynamic equilibrium
A reversible reaction is where products can, under
appropriate conditions, turn back into reactants.
· There will be a range of conditions over which both
the forward and backward reaction will take place and
this can lead to a state of balance with both reactants
and products present in unchanging amounts.
· This is called a dynamic equilibrium.
these combine these decompose…read more

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