Enthaply Changes Flashcards
What is the standard enthalpy change of neutralisation?
It is the energy change that accompanies the reaction of an acid by a base to form 1 mole of water, under standard conditions, with all reactants and products in their standard states.
What is the standard enthalpy change of formation?
It is the the enthalpy change that takes place when one mole of a compound is formed from its elements, under standard conditions, with all products and reactants in the standard states.
What is the standard enthalpy change that of combustion?
It is the enthalpy change that takes place when one mole of a substance reacts completely with oxygen, under standard conditions, with all reactants and products in standard conditions.
What are the standard conditions?
- 100Ka Pressure
- 25C/298K Temperature
- 1mol/dm-3 Concentration
What is the standard enthalpy change of reaction?
The standard enthalpy change of reaction is the enthalpy change that accompanies the reaction in the molar quantities shown in a chemical equation under standard conditions, with all the reactants and products in their standard states
describe in terms of bond breaking and bond making what happens in an endothermic reaction.
Energy is absorbed to break bonds. Bond-breaking is an endothermic process.
describe in terms of bond breaking and bond making what happens in an exothermic reaction
Energy is released when new bonds form. Bond-making is an exothermic process.
What happens to the temperature in an exothermic reaction?
the temperature increases, energy is released to the surroundings
What happens to the temperature in an endothermic reaction?
the temperature decreases, energy is absorbed
