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Physics reasonable estimates? :/

Okay so there's this question in Oct/Nov 2010 paper 23. Q: Make estimates. a) thickness of a sheet of paper b) time for sound to travel 100m in air. c) the weight of 1000cm^3 of water part b can be easily calculated but HOW THE HELL do we do parts a) and c) ?? PLEASE HELP!! :(
- Mssamgirl15
- Thread
- May 20, 2011
- Replies: 12
- Forum: A-Levels
M
How did Chem Paper 33 went???

Btw guys if you let's say mess up the salt section and waste one of the the solids, are the invigilators allowed to give some more to you or are you completely screwed up???
- Mssamgirl15
- Post #4
- May 12, 2011
- Forum: A-Levels
M
the perfect titre......!!!!!

At our centre it was 30.00 cm^3. :/ Wth?
- Mssamgirl15
- Post #49
- May 12, 2011
- Forum: A-Levels
M
How did Chem Paper 33 went???

Me too. Ran out of time. I hope the Gt's low. Or else I'll have to repeat it in Oct/Nov. :@
- Mssamgirl15
- Post #3
- May 12, 2011
- Forum: A-Levels
M
use of 2,4-DNPH

Aldehydes and Ketones,both give a yellow/orange ppt. with 2-4 DNPH or Brady's Reagent. :)
- Mssamgirl15
- Post #2
- Apr 30, 2011
- Forum: A-Levels

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