Energy transfer in reactions Flashcards
Exothermic reactions
Reactions which give out energy to the surroundings, usually in the form of heat (shown by a rise in temperature).
Endothermic reactions
Reactions which take in energy from the surroundings, usually in the form of heat (shown by a fall in temperature).
Enthalpy change
The change in energy (delta H)
Units for enthalpy change
kJ/mol
What is the enthalpy change for an exothermic reaction?
-
What is the enthalpy change for an endothermic reaction?
+
Define activation energy
The energy required to start a reaction.
What does the reaction profile for an exothermic reaction look like?
The products are at a lower energy than the reactants.
What does the reaction profile for an endothermic reaction look like?
The products are at a higher energy than the reactants.
