Monday, March 28, 2005
Woke up at 9.30am today...took out my chem notes and read it til abt 11..den i slack n watch tv..think this is e first time im so least prepare for test..be it chem or other subj...Reach the test venue...i look at qns 1, i dunno how to do liao, lucky is a mcq qns...is really very not typical qns..the qns goes:
15 cm3 of an organic compound containin carbon, hydrogen and oxygen is burnt completely in air at a temperature of 160 degree celcius. when the resulting gas mixture is passed through concentrated sulphuric acid and then subsequently through aqueous sodium hydroxide, equal reductions in volume of 45 cm3 each resulted. what could be the compound?
A) CH3COCH3
B) CH3CH2OCH3
C) CH2CHCHO
D) CH3 CH2OH
I really dunno wad does the 45 cm3 reduction means. dun really understand the qns...i oni noe tat co2 n H2O is e product after complete combustion..haha
structure qns still ok...i think if i really study as hard as the previous times..i think can do...hope i can pass lo..this test i solely depend on my memory base on wad i studied for last term test..