Enthalpy Flashcards
What are standard conditions
100KPa. 298K. 1moldm-3
What is an endothermic reaction
A reaction that takes in energy from the sorroundings
What is an exothermic reaction
A reaction that releases energy to the surroundings
How do you draw enthalpy change diagrams
Reeactants, activation energy, products, energy change
What is standard enthalpy of reaction
The enthalpy change that accompanies the reaction in the molar quantities that is shown in the equasion. Under standard conditions
What is enthalpy change of formation
The enthalpy change that accompanies the formation of 1 mole of a compound from its constituent elements in their standard states under standard conditions
What is enthalpy of combustion
The enthalpy change that accompanies the reaction of 1 mole of a substance completely with oxygen. All reactants and products being in their standard states under standard conditions
What is enthalpy change of neutralisation
The enthalpy change the accompanies the formation of 1 mole of water from and acid and an alkali, all reactants and products being in their standard states and under standard conditions
What is bond breaking, endo or exo
ENDOTHERMIC
Bond making, endo or exo
EXOTHERMIC
what is average bond enthalpy
The average amount of energy needed to break a bond, averaged across a range of different compounds
What’s the equation for energy change
Q = MC delta T
How do you work out enthalpy change
energy change / moles
how to work out enthalpy change from bonds
sum of broken - sum of made
What’s hess’ law
The total energy change of a reaction is always the same no matter the pathway
