first and foremost,



HAPPY BIRTHDAY NADIA (:

well, it seems so weird. but i had a really weird dream and it was so funny that when i woke up, i was laughing away. haha.
school's gonna start tomorrow and i'm still not in the mood to study.
grandma is still in the hospital and i cant put my mind at ease. sigh
well, since tomorrow is chemistry quiz, i shall write what i have to learn here. since i think that i learn better when it is in the computer. yea i know. i'm weird.

DEFINITIONS
1) standard enthalpy change of combustion: enthalpy change when 1 mole of a compound or element is burned completely in oxygen at standard conditions.
equation: C (s) + O2(g) -> CO2 (g)
2) standard enthalpy change of formation: enthalpy change
when 1 mole of a pure compound is formed from its elements in their standard states at standard conditions.
equation: H2 (g) + 1/2 O2(g) -> H2O(l)
3) standard enthalpy change of neutralisation: enthalpy change when one mole of water is formed during neutralisation between an acid and a base under standard conditions.
equation: HCl (aq) + NaOH(aq) -> NaCl(s) + H2O(l)
4) ionisation energy: the minimum energy required to remove the outermost electron from 1 mole of its gaseous atoms/ions
in its ground state.
equation: M(g) -> M^+ (g) + e
5) bond dissociation energy: energy required to break one mole of covalent bonds between 2 atoms in the gaseous state.
equation: O2 -> 2O
6) lattice energy: enthalpy change when 1 mole of an ionic crystalline
solid is formed from its separate gaseous ions under standard conditions.
equation: M^+(g) + A^-(g) -> MA(s)
7) HESS LAW: enthalpy change for a chemical reaction is the same, regardless of the route taken, provided that the initial states of the reactants and the final states of the products are the same.

(a) enthalpy change of the reaction = [total standard enthalpy change of formation of the products] - [total standard enthalpy change of formation of the reactants]
(b) enthalpy change of the reaction = [total standard enthalpy
change of combustion of the reactants] - [total standard enthalpy change of combustion of the products]

ok. i'm done. wish me luck for tomorrow's test

ouh i made a discovery.i used livejournal for only 80 days =X
which is like 2 months plus, oh god.