Chemistry P6 18/5/010

[guMnam]

Can someone give me a link to the Mark scheme of chemistry paper 6 summer 2000? I dont seem to find it at xtremepapers..

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/1993-2003/chemistry1993-2000answers.pdf

[ismailb_1993]

I have a question. In M/J 99 paper 6 chem question 3c.) wouldnt the sketch plateu at a lower level than the initial line because the concentration is greater?

[Ghost Of Highbury]

I have a question. In M/J 99 paper 6 chem question 3c.) wouldnt the sketch plateu at a lower level than the initial line because the concentration is greater?

It is lower because the y-axis reads Mass. More concentration, more particles of marble chips will react *faster* with the HCl and thus the mass at a specific time will decrease. Thus, the curve will be lower.

[6394]

"extrapolation shown" wat dus this meanits ddere in ms
< 2009 m/j ques 4-e)1 >

[Ghost Of Highbury]

They want u to show how u used the graph to get the value. Show the creation of a new point on the graph.

[ismailb_1993]

It is lower because the y-axis reads Mass. More concentration, more particles of marble chips will react and thus the mass will decrease. Thus, the curve will be lower.

that's exactly what i thought as well, but when i checked the mark scheme which in fact is unofficial  it indicated that it would level off at the same level...i guess it's wrong.

[Mr.Lonely]

hey guys i hve a ques?
wat volume of HCL  is need 2 neutralise 25 cm cubed of NaOH
ppr 6 2009 ques 2d(iii)??
rsvp

[WARRIOR]

hey guys i hve a ques?
wat volume of HCL  is need 2 neutralise 25 cm cubed of NaOH
ppr 6 2009 ques 2d(iii)??
rsvp

oct/noc or may june?

[Mr.Lonely]

ooh ya sry .. may/june

[Ghost Of Highbury]

Yes it will level off the same level because the mass and size of the marble chips didnt change. Wat changed was the concentration of HCl which made the reaction faster. At last, all the marble chips were used and thus the mass remained the same.

[The InViSiBlE GIrl (Eva)]

hey guys i hve a ques?
wat volume of HCL  is need 2 neutralise 25 cm cubed of NaOH
ppr 6 2009 ques 2d(iii)??
rsvp

Its at 22.5 cm cubed. And u find this be making 2 lines on that graph until they intersect. N d point of intersection is at 22 .5 cm cubed

[Mr.Lonely]

Thanks a lot... i owe u one

[DEGO]

hey kimo can u upload pades for lab tools i want to remember thm XD Thank You

[WARRIOR]

hey kimo can u upload pades for lab tools i want to remember thm XD Thank You

pades?

[DEGO]

sry i ment pages typo XD