Module 3- enthalpy Flashcards
1
Q
enthalpy
A
measure of the heat energy in a chemical system
2
Q
enthalpy change eq
A
H(products)- H(reactants)
3
Q
exothermic
A
enthalpy change is negative
chemical system releases heat energy to surroundings
temp of surroundings increases
4
Q
endothermic
A
enthalpy change is positive
chemical system takes in heat energy from surroundings
temp of surroundings decreases
5
Q
activation energy
A
minimum energy required for a reaction to take place
6
Q
standard conditions
A
100kPa/ 1 atm
298K / 25 C
1 moldm-3
standard state
7
Q
standard state
A
physical state of a substance under standard conditions
8
Q
standard enthalpy change of reaction
A
enthalpy change that accompanies a reaction in the molar quantities shown in a chemical equation under standard conditions
