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Chemistry paper 1
energy changes
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Cards (12)
an
exothermic
reaction transfers
energy
to the
surroundings
so the
temperature
of the surroundings
increases
example of exothermic reactions are:
combustion
neutralisation
oxidisation
reactions
an
endothermic
reaction takes in
energy
from the
surroundings
so the
temperature
of the surroundings
decreases
the
activation energy
is the
minimum
amount of
energy
that
particles
must have to
react
during a chemical reaction,
energy
must be supplied to break
bonds
in the
reactants
what is
released
when bonds in the product are
formed
?
energy
sum of
energy
taken
in
- sum of energy
released
to form
bonds
=
overall energy change
what does the voltage produced by a cell depend on?
the type of
electrode
and
electrolyte
non-rechargeable cells and batteries have a
limiting factor
in the chemical reaction, alkaline batteries are an example
why are some cells rechargeable?
the chemical reactions
reverse
when an external
electrical
current
is supplied
advantages of fuel cells:
less
pollution
compact
and
lightweight
reliable
high
efficiency
hydrogen fuel cells use the
oxidation
of hydrogen to generate a
voltage
, the only waste product is
water
