Topic 5 - Energy Transfer in Reactions Flashcards
1
Q
what is an exothermic reaction?
A
a reaction which gives out energy to the surroundings, usually in the form of heat and usually shown by a rise in temperature of the surroundings
2
Q
what is an endothermic reaction?
A
a reaction which takes in energy to the surroundings, usually in the form of heat and usually shown by a fall in temperature of the surroundings
3
Q
what is the overall change in energy in a reaction called?
A
enthalpy change
4
Q
what are the units of enthalpy change?
A
kJ/mol
5
Q
if the reaction is exothermic what is the enthalpy change value?
A
negative because the reaction is giving out energy
6
Q
if the reaction is endothermic what is the enthalpy change value?
A
positive because the reaction is taking in energy
