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#97961 Chromosome walking

Posted by someone11 on 18 May 2007 - 10:44 AM in Biology

My bio teacher told me that chromosome walking has been taken out of the syllabus, is this true? I hope so as it's one less thing to learn!!!



#83284 i went over it with chem teacher

Posted by someone11 on 07 June 2006 - 05:32 PM in Chemistry

who cares actually. it was only worth 1% of your mark. enjoy your summer yall



#82765 i went over it with chem teacher

Posted by someone11 on 02 June 2006 - 02:39 PM in Chemistry

nonono. not to disallow cheaters. It was to make the test more reliable, its harder to test a gas than a liquid.



#82705 i went over it with chem teacher

Posted by someone11 on 01 June 2006 - 08:01 PM in Chemistry

I went over it with my chem teacher.


The use of the plastic bag was to CONDENSE WATER VAPOURS
It was addition polymerisation


any other question?

oh and for the record usually in chemistry, especially with questions on experiments, there is usually only one purpose.



#82166 2002 - Written Paper - Q4(b)

Posted by someone11 on 27 May 2006 - 12:01 PM in Problem Questions

QUOTE(thegift_guitar @ May 26 2006, 05:12 PM) View Post

I did that question recently. All i did was look at the diagram there, and there were bubbles cumin out, and if u look at the equation the only gas that could be formed is hydrogen. Thats all there is to it really. Plus its only 1 mark.


There is no diagram. huh.gif sad.gif



#81768 PPA Hints

Posted by someone11 on 26 May 2006 - 08:30 AM in Chemistry

whats the sulphuric acid for??



#81508 2002 - Written Paper - Q4(b)

Posted by someone11 on 24 May 2006 - 10:48 PM in Problem Questions

Hello

yea sorry i get it now, it was late i was rambling.

I actually havea genuine question about 2002, question 4b)

The reaction FeS and FeCl -----> H2S + FeCl


In FeS iron is sometimes present as an impurity. Name the other product which would be formed in the reaction with dilute hydrochloric acid if iron metal is present as an impurity.

The answr is hydrogen but how?????



#81481 2002 - Multiple Choice - Q12

Posted by someone11 on 24 May 2006 - 09:41 PM in Problem Questions

It is known that protons and neutrons are made up of smaller particles called quarks.

Each proton and each neutron contain 3 quarks,

What is the approximate number of quarks in 1g of carbon-12?

a. 6x10^23
b. 9x10^23
c. 1.8x10^24
d. 2.16x10^25

i dont understand how its any of these? if 12g of carbon is 6x10^23, how can 1g be any of those? even if it does contain 3 quarks.

i think it should be

12g -------> 6x10^23
1g---------> 6x10^23 / 12
no. of quarks 6x10^23 x 3/12