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Paper 1
Energy Changes
Batteries and cells
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Mohamed Sid Ahmed
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Fuel cells
Chemistry > Paper 1 > Energy Changes > Batteries and cells
6 cards
Cards (9)
Calculating energy change for a chemical reaction using bond energies
1. Break bonds on
left
side
2. Make bonds on
right
side
3. Calculate
total
energy input
4. Calculate
total
energy output
5.
Subtract
energy output from energy input to get
overall
energy change
Bond
energy

Energy required to
break
or make a
chemical
bond
The positive sign indicates energy input (
endothermic
) and the negative sign indicates energy output (
exothermic
)
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