definitions Flashcards
Definition of first ionisation energy
energy required to remove one mole of electrons from one mole of gaseous atoms of an element to form one mole of gaseous ions under standard conditions
Definition of second ionisation energy
energy required to remove one mole of electrons from one mole of gaseous ions of an element to form one mole of gaseous 2+ ions under standard conditions
Defintion of electronegativity
The power of an atom to attract electrons to itself
Definition of average bond enthalpy
Average enthalpy change when one mole of bond is broken
Definition of enthalpy change of combustion
Energy change when one mole of substance is combusted
Racemic Mixture
A mixture that contains each optical isomer in a 50:50 ratio
Definition of relative molecular mass
Mass of a molecule relative to 1/12 of an atom of carbon 12
Two assumptions for ideal gas
Negligible volume of molecule
No intermolecular force
Two conditions for ideal gas
High temperature
Low Pressure
Definition of Rate of reaction
Change in amount of substance with time
Definition of empirical formula
the simplest whole number ratio of the elements present in one molecule or formula unit of the compound
Definition of molecular formula
the formula that shows the number and type of each atom in a molecule
