energetics Flashcards
(6 cards)
1
Q
Define exothermic.
A
Reaction that releases energy to surroundings (ΔH negative).
2
Q
Define endothermic.
A
Reaction that absorbs energy from surroundings (ΔH positive).
3
Q
Mean bond enthalpy?
A
Average energy required to break 1 mole of a bond in gaseous molecules.
4
Q
Enthalpy change from experiment?
A
q = mcΔT; ΔH = q / moles.
5
Q
Units of q?
A
Joules (J).
6
Q
Standard conditions for enthalpy?
A
100 kPa, 298K, 1 mol/dm³.
