Section 2 Flashcards
standard conditions
298K and 100kPa
enthalpy change of reaction
enthalpy change when a reaction occurs in the molar quantities shown in the chemical equation,
standard conditions, standard states
enthalpy change of formation
enthalpy change when 1 mole of compound is formed from its elements in their standard states under standard conditions
enthalpy change of combustion
enthalpy change when 1 mole of substance is completely burned in oxygen under standard conditions in their standard states
enthalpy change of neutralisation
enthalpy change when solutions of an acid and alkali react together to form 1 mole of water under standard conditions
activation energy
minimum amount of energy needed to begin breaking reactant bonds and start chemical reaction
bond breaking
endo
bond making
exo
enthalpy change of reaction equation
total energy absorbed - released
collision theory
reaction will not occur unless particles collide with a certain minimum amount of kinetic energy
catalyst
lower activation energy
provide alternate path for reaction
dont get used
heterogenous catalyst
one in different phase from the reactants
homogenous catalyst
same physical state as reactants
reaction rate
the change in amount of products or reactants per unit time
dynamic equilibrium
forward reaction = backwards reaction
closed system
concentrations remain constant
