CHEM AND BIO HELP AND TIPS HERE

[Ghost Of Highbury]

oh ok .. umm .. y not C .. even it has ammonia ..   or is that without any other insoluble gas water wont move up due to pressure or something ?(i kno i sound stupid :|)  

if it were ammonia, the whole thing wudve dissolved and there wudve been no gas left in it...bu the RESULT shows that there was some gas in the tube..

[Ghost Of Highbury]

chemistry

variant?

[princess12]

11

[Vin]

I've got a small question:

Blood in the smallest arteries in a muscle flows into networks of capillaries.

The flow through these networks is much slower than through arteries or veins.

Suggest how these features, together with the structure of capillaries, assist in supplying glucose to muscle cells.    

(4 marks)

thin in diameter/small, glucose supplied faster
slow rate so more amount of glucose supplied
capillaries are numerous, have large surface area

[princess12]

 
oct nov 2009 question no 17,18,21,34

[holtadit]

oct nov 2009 question no 17,18,21,34

Please do not SPAM with multiple  question marks.

A@di will be along soon - just hang in there. 

[soulreapr_ninja]

thin in diameter/small, glucose supplied faster
slow rate so more amount of glucose supplied
capillaries are numerous, have large surface area

also, blood cells pass through the capillaries slowly to allow diffusion of materials and the tissue fliud
capillaries are smaller and thin so diffusion rate is faster
tissue fluid provides a medium of exchange between the capillaries and the surrounding muscle cells

[Ghost Of Highbury]

variant?

variant?

17) coppe sulfate is hydrated, wen it loses water, water can again be added to make it blue. so reversible. C

18) D - Carbon monoxide reduces Iron oxide. (Iron extraction, remember?)

21) D= to be alkaline ph>7, R and S

24) A = the color gets darker down the halogens group, Thus Astatine is either dark brown or black, cant be dark brown, because the row also says its gas. Astatine is solid as its the last in the group of halogens..

34) A -  78.09% nitrogen, 20.95% oxygen,0.038% carbon dioxide,

[Vin]

oct nov 2009 question no 17,18,21,34
explain me fast urgently
 
in paper 1

21. D  anything greater than 7 is alkaline
34. A
Earth's composition of air
Nitrogen : 78%
Oxygen : 21%
CO2     :  0.04%

[princess12]

thanxs

[Ghost Of Highbury]

if it were ammonia, the whole thing wudve dissolved and there wudve been no gas left in it...bu the RESULT shows that there was some gas in the tube..

plz tell me if this was clear or not?

[Vin]

plz tell me if this was clear or not?

oh ya ya thanks !!

[Moonlyte]

thin in diameter/small, glucose supplied faster
slow rate so more amount of glucose supplied
capillaries are numerous, have large surface area

Thanks!!

[Vin]

Thanks!!

finally u solved the prob of quoting

[rhea]

have a question:

In which change is the nitrogen reduced?

A. NH3 to NO
B.NH3 to NO^-3
C.N2 to NH3
D. N^3- to N2

PLLZZ HELLP OOUUTT!!

i have NO idea of how to do this question!