Key Terms Flashcards
Molecular formula
The actual number and identity of each type of atom in a molecule
Empirical formula
The simplest ratio of the number of atoms of each element in a compound
Relative atomic mass
The average mass of one atom of an element divided by 1/12th mass of one atom of 12C
First ionisation energy
The energy needed to remove 1 mole of electrons from 1 mole of gaseous atoms to make 1 mole of gaseous ions
Electronegativity
The ability of an atom to attract bonding electrons in a covalent bond
enthalpy change when 1 mole of a compound is formed from its elements with all products and reactants in their standard states under standard conditions
Enthalpy change when 1 mole of a substance is completely burned in oxygen with all products and reactants in their standard states under standard conditions
Mean bond enthalpy
Enthalpy change when 1 mole of gaseous covalent bonds are broken averaged over a range of compounds
Enthalpy change
Heat change under a constant pressure
Standard conditions
298K, 100Kpa (1 mole)
Hess Law
Enthalpy change of a reaction is independent of the rout taken
how do you work out atom economy?
(mass of desired product / mass of reactants) X 100
