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Paper 1
C5
Exothermic & Endothermic reactions
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Joanna S
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Cards (6)
Exothermic reaction - a reaction where energy is
released
to the
surroundings
Endothermic reaction - a reaction that
takes
in energy from the surroundings
In an endothermic reaction, the energy needed to
break
existing bonds is
greater
than the energy released from
forming new
bonds
In an exothermic reaction, the energy
released
from forming
new
bonds is
greater
than the energy needed to
break existing bonds
Activation energy - the
minimum
amount of
energy
needed for particles to
collide
with each other and
react
Energy profiles
A)
Exothermic
B)
Activation energy
C)
Energy change
D)
Endothermic
E)
Activation energy
F)
Energy change
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