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[ This Message was edited by: miss copperfield on 2006-06-16 19:09 ]
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Posted: 2006-02-07 18:06:15
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I know some chemistry. Post ur questions and i will try 2 help.
This message was posted from a WAP device
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Posted: 2006-02-07 18:47:20
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it depends what sort of chemistry,i got a B in it (well im AT a B) so if its GCSE level i COULD help, not too sure, depends...
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Posted: 2006-02-07 19:02:51
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im at A* at GCSE if you need some help
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Posted: 2006-02-07 19:23:21
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Thanks guys! It is access level which is A Level equivalent i suppose, will get the questions up asap. Just got an essay to finish.
Cheers for this in advance. You will probably think i am thick
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Posted: 2006-02-07 19:26:59
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Gcse A*
Alevel A
Biochemistry degree and currently studying pHD in biochemistry, I'll do my best
This message was posted from a K750
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Posted: 2006-02-07 20:20:14
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Ok here they are:
1) Balance the following equations:
BaCl2 + Na2SO4 gives NaCl + BaSO4
C5H11OH + O2 gives CO2 + H2O
2) The molar mass of potassium carbonate, K2CO3, is 138.
a) Determine the percentage of potassium and carbonate ions in K2CO3
b) When potassium carbonate was added to an aqeuous solution containing 10g of silver nitrate a precipitate of silver carbonate was produced.
i) Calculate the moles of AgNO3 in 10g.
ii) Hence determine the moles of Ag2CO3 produced by the 10g of AgNO3
iii) Calculate the mass of Ag2CO3 produced.
iv) What mass of K2CO3 is needed to react with 10g of AgNO3
c) Analysis of the essencial amino acid asparagine showed that it contains 41 36% carbon, 8.06% hydrogen, 32.19% nitrogen and 18.38% oxygen. It has a relative molecular mass of 174. Determine the molecular formula of asparagine.
Ok so i am not sure how to get the numbers to shop up small but they won't but i am sure you know what i mean, very grateful to anyone that can help out, i just do not get all of these calculations stuff.
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Posted: 2006-02-07 20:27:13
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Quote:
On 2006-02-07 20:27:13, miss copperfield wrote:
Ok here they are:
1) Balance the following equations:
BaCl2 + Na2SO4 gives NaCl + BaSO4
C5H11OH + O2 gives CO2 + H2O
2) The molar mass of potassium carbonate, K2CO3, is 138.
a) Determine the percentage of potassium and carbonate ions in K2CO3
b) When potassium carbonate was added to an aqeuous solution containing 10g of silver nitrate a precipitate of silver carbonate was produced.
i) Calculate the moles of AgNO3 in 10g.
ii) Hence determine the moles of Ag2CO3 produced by the 10g of AgNO3
iii) Calculate the mass of Ag2CO3 produced.
iv) What mass of K2CO3 is needed to react with 10g of AgNO3
c) Analysis of the essencial amino acid asparagine showed that it contains 41 36% carbon, 8.06% hydrogen, 32.19% nitrogen and 18.38% oxygen. It has a relative molecular mass of 174. Determine the molecular formula of asparagine.
Ok so i am not sure how to get the numbers to shop up small but they won't but i am sure you know what i mean, very grateful to anyone that can help out, i just do not get all of these calculations stuff.
surely the dide that wrote the questions knows the answers, so what is the point in you answering??
just realised thats about as helpful as a chocolate fireguard, sorry ill leave now.
fatreg
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Posted: 2006-02-07 20:33:00
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EastCoastStar Posts: > 500
i dont have time right now, but if you still need it, i can gladly do it later. (not too hard
, i was alwyas good at chemistry and math)
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Posted: 2006-02-07 20:52:00
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Quote:
On 2006-02-07 20:27:13, miss copperfield wrote:
Ok here they are:
1) Balance the following equations:
BaCl2 + Na2SO4 gives NaCl + BaSO4
BaCl2 + Na2SO4 gives
2(NaCl) + BaSO4
C5H11OH + O2 gives CO2 + H2O
2(C5H11OH) +
12(O2) --->
10(CO2) +
6(H2O)
I gtg now, that is 9th grade chemestry so they are very easy. I will try to finishing answering later.
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Posted: 2006-02-07 21:52:28
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