U1-Jan-2011-NS
Posted by: intechemistry on: September 24, 2010
Here we will discuss the Unit 1, Jan 2011 ‘New Syllabus’ past years papers (PYP’s):
Question paper:
Mark scheme:
5 Responses to "U1-Jan-2011-NS"
May 15, 2012 at 5:05 pm
The fllask MUST BE STOPPERED before you mix the substances or you will lose some gas(prssure).
problm solved by placing acid in a small container and put this small container in a suitable (larger) flask. Then stopper. Shake the flask to mix the coral and acid. Can put the coral in the small container but it may be floating on the liquid phase acid and may top over before you can stopper.
Can also suspend the acid in a small test tube attacked with string and when stoppered, tilt the flask to mix the substances.
May 15, 2012 at 6:19 pm
Hmmm…it means, we need to put the coral first before we place the small container in the conical flask?
May 15, 2012 at 6:34 pm
Doesn’t really matter which is first. Probably easier to lower in the container of acid in first, then put the solid coral in at the end just before stopping.
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May 15, 2012 at 1:23 pm
Hello Sir. I would like to ask you question no.16 b(ii). The question require us to suggest the method to mix acid and coral to ensure no Co2 escaped from the apparatus. Well, honestly speaking, my answer would be mixing up the two reactants and it is immediately stoppered with a bung, but it is REJECTED! So,what should be the best answer? The answer scheme do not state a clear answer, so I would like to know which answer can be accepted..