8 energetics 1 Flashcards
enthalpy change of a reaction
the enthalpy change when quantities of substances in standard states react completely under standard conditions
enthalpy change of formation
the enthalpy change when one mole of substances is produced from its elements under standard conditions
enthalpy change of combustion
the enthalpy change when one mole of a substance is burned completed in oxygen under standard conditions
enthalpy change of neutralisation
the enthalpy change when solutions of acid and alkali react together under standard conditions to produce one mole of water
what is an endothermic reaction
heat is taken in from surroundings as more energy is required to break bonds than make them
what is an exothermic reaction
heat is given out into surroundings as more energy is needed to break bonds than make them
what are standard conditions
100kPa pressure and 298k
what is the definition of specific heat capacity
the energy required to raise 1g of substance by 1K without a change in state
equation to calculate energy change
q = mCAT
definition of bond enthalpy
the energy required to break one mole of the stated bond in a gaseous state under standard conditions
calculation for enthalpy change
breaking - making
