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U3-3-1 - Energy Changes
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Total cards: 6•Content version: v4•Public deck•Updated: 8/1/2026
Card preview (6)
#1
Front (Question)
Enthalpy
Back (Answer)
A measure of the chemical energy in a substance. (symbol is H)
#2
Front (Question)
What is ∆H?
Back (Answer)
Enthalpy change - energy difference between reactants and products.
#3
Front (Question)
If a reaction is exothermic, ∆H is…
Back (Answer)
negative. (∆H < 0)
#4
Front (Question)
If a reaction is endothermic, ∆H is…
Back (Answer)
positive. (∆H > 0)
#5
Front (Question)
What is X?
Back (Answer)
Enthalpy change
#6
Front (Question)
Why is it important to know if a reaction is exothermic or endothermic?
Back (Answer)
Any one of: • If reactions are exothermic, heat will need to be removed • If reactions are endothermic, heat will need to be supplied • So that chemists can create conditions to maximise yield