Energy Transfer in Reactions Flashcards
(6 cards)
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 in the surroundings
2
Q
what is an endothermic reaction?
A
a reaction which takes in energy from the surroundings, usually in the form of heat and usually shown by a fall in temperature of the surroundings
3
Q
what is enthalpy change and what is its symbol?
A
the overall change in energy in a reaction - its symbol is ΔH
4
Q
what are the units of enthalpy change?
A
kJ/mol
5
Q
if a reaction is exothermic, what value will the enthalpy change have?
A
negative value - the reaction is giving out energy
6
Q
if a reaction is endothermic, what value will the enthalpy change have?
A
positive value - the reaction takes in energy
