Energetics Flashcards
State Hess’ Law.
The enthalpy change for chemical reaction is the same regardless of whether the reaction takes place in one step or several steps, provided that the initial states of the reactants and the final states of the products are the same.
What is lattice energy?
It is heat energy envolved when one mole of solid ionic compound is formed from its constituent gaseous ions at 298K and 1 atm.
What do you know by bond energy?
It is average energy required to break one mole of covalent bond in the gas phase into constituent gaseous atoms under standard conditions.
What is enthalpy change of neutralisation?
It is enthalpy change when an acid and base react under infinitely dilute conditions to form one mole of water at 298K and 1 atm.
What is enthalpy change of combustion?
It is heat energy evolved when one mole of substance is completely burnt in oxygen at 298K and 1 atm.
What is enthalpy change of formation?
It is enthalpy change when one mole of substance is formed from its constituent elements in their standard states at 298K and 1 atm.
What is enthalpy change of reaction?
It is enthalpy change when molar quantities of reactants as stated in the equation react together under standard conditions of 298K and 1 atm.
