ah.
the joys of being sick one day before a test :D
you can totalleh rest and relax and mug throughout the day (:
but shit i missed choir lucky AGM not today -____-

for all you late night chem muggers...
HERE'S NOTES :D

Mole Concept:
• Mass (in grams) = Mass of 1 mol X number of mols
• Number of mols = Mass of element (in grams) / Mass of 1 mol (in grams)
• Mass (in grams) = Mr
• Gas is always 24 dm¬¬¬3 in volume
• Concentration = Number of mols (refer to 2) / volume of solution in dm3
• Empirical Formula:
Element 1(Ar:10) Element 2(Ar:10)
Mass reacting (in grams) 0.10 0.30
Or
% by mass 25% 75%

Number of Mols 0.10/10 = 0.01 mol 0.30/10 = 0.03 mol

25/10 = 2.5 mol 75/10 = 7.5 mol


Mol ratio 1:3
Emp. Formula E1(E2)3

Acids & Bases:
• Acids – any compound that can willingly donate 1 H+ ion when dissolved in water
• Bases – any substance that can willingly accept 1 H+ ion (commonly OH-, O2-)
• Alkali – all soluble bases
• Acids + Bases -> Salt + H2O
• Acids + Carbonate ( (CO3)2- )-> Salt + H2O + CO2
• Acids + Sulphites ( (SO3)2- ) -> Salt + H2O + SO2
• Acids + Certain Metals ( (Mg)2+, (Fe)2+, (Zn)2+ ) -> Salt + H2
• Base + NH4 salt -> Salt + H2O + NH3
• Alkali + Certain Salts -> Salt + Insoluble OH-




yup that's about it.
oh but my stomach hurts so T_T