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Chemistry gcse paper 1
Topic 5- Energy Changes - EXO AND ENDO Reactions
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Energy changes flashcards
Chemistry gcse paper 1 > Topic 5- Energy Changes - EXO AND ENDO Reactions
16 cards
Cards (34)
Exothermic reaction
A reaction that transfers energy to the surroundings so the temperature of the surroundings
increases
Endothermic reaction
A reaction that takes in energy from the surroundings so the temperature of the surroundings
decreases
Endothermic reactions
Thermal
decomposition
Reaction of
citric acid
and
sodium hydrogencarbonate
Everyday examples of exothermic reactions
Self-heating
cans (e.g. for coffee)
Hand
warmers
Everyday examples of
endothermic
reactions
Sports injury packs
Activation energy
Minimum
amount of energy that
particles
must have to react
Exothermic
reaction
Products have
less
energy than reactants
Endothermic reaction
Products have
more
energy than reactants
Exothermic reactions
C-
Combustion
O- Oxidisation Reactions
N -
Neutralisation
Everyday
examples of exothermic reactions
Self-heating
cans (e.g. for coffee)
Hand
warmers
Everyday
examples of
endothermic
reactions
Sports injury packs
Activation
energy
Minimum
amount of energy that
particles
must have to react
Exothermic reaction
Products have
less
energy than reactants
Endothermic reaction
Products have
more
energy than reactants
Energy changes during a chemical reaction
1. Energy must be
supplied
to break bonds in the reactants
2. Energy is
released
when bonds in the products are formed
The sum of energy taken in to
break
bonds - the sum of energy
released
to form bonds = the overall energy change
Endothermic reaction
Energy taken in to break bonds is
more than
the energy released when bonds are formed
Exothermic reaction
Energy taken in to break bonds is
less than
the energy released when bonds are formed
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