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Slide 2

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Most chemical A few reactions go both
reactions only `go' ways. These are called
one way. `REVERSIBLE'
Reactants Products Reactants Products…read more

Slide 3

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HAND WARMERS USE A REVERSIBLE REACTION
These are plastic bags containing
sodium acetate crystals in solution.
1. Put bag in hot water for a few
minutes and the cloudy liquid goes
clear as the crystals dissolve
2. Let it cool down
3. Click the metal disc inside and the
clear liquid goes cloudy again and
gets HOT.
Click disc
HEAT IN HEAT OUT
ENDOTHERMIC EXOTHERMIC
FORWARD REACTION REVERSE REACTION…read more

Slide 4

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In a reversible reaction, the REACTANTS turn into PRODUCTS
AND
the PRODUCTS can be turned back into the REACTANTS
BLUE COPPER WHITE COPPER + WATER
SULPHATE SULPHATE (STEAM)
REACTANT PRODUCTS
FORWARD REVERSE
REACTION REACTION
ENDO- EXO-
THERMIC THERMIC
Heat IN Heat OUT…read more

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Equilibrium
If we make a CLOSED SYSTEM by
preventing any reactants or
products escaping....
White copper The RATE of the FORWARD REACTION
sulphate balances
(PRODUCT)
the RATE of the REVERSE REACTION
So we have both REACTANTS
AND PRODUCTS CONSTANTLY
Water TURNING INTO EACH OTHER
(PRODUCT)
And the system is in EQUILIBRIUM
Blue copper
sulphate
(REACTANT)…read more

Slide 6

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Removal of Product (s)
If we want to make and collect one (or both) of the products
in a reversible reaction, it must be steadily removed from
the system as we go
WATER REMOVED
so REVERSE
REACTION can't
happen
so PRODUCT
can be collected
Heat IN…read more

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