Energetics Flashcards
1
Q
What s the definition of enthalpy change
A
The heat or energy change measured at constant pressure.
2
Q
What does the word standard mean
A
That the temp and pressure are:
Temp = 298k
Pressure= 100 kPa
3
Q
What is an exothermic reaction
A
One where heat energy is given up from a system to the surroundings; delta H is NEGATIVE (the measured temp increases)
4
Q
What is an endothermic reaction
A
Reaction where heat energy is taken into a system from the surroundings; delta H is POSITIVE (the measured temperature decreases)
5
Q
What is the unit of enthalpy change
A
KJ/mol or kJmol-1
6
Q
A
