1.4 Energetics Flashcards
What is enthalpy change?
The heat change under certain pressures and conditions
Endothermic
Takes in energy (+∆H)
Exothermic
Gives out energy (-∆H)
Enthalpy of Combustion
Enthalpy change when 1 mole of a substance is completely burned in oxygen under standard states and conditions with all reactants and products in their standard states
Enthalpy of Reaction
Enthalpy change when a reaction occurs in the molar quantities shown in the chemical equation under standard states and conditions with all reactants and products in their standard states
Enthalpy of Formation
Enthalpy change when 1 mole of a compound is formed from its elements under standard states and conditions with all reactants and products in their standard states
Standard Condition
100 KPa, 298K
Mean Bond Enthalpy
Average energy per mole to break bond between two atoms
Calculate Heat Loss
Q=MC∆T Q-KJ/mol M-Mass C-Specific Heat Capacity ∆T- Change in Temp
Hess’ Law
The total enthalpy change for a reaction is independant of the route taken