Chemistry Paper 61

[Nawaf Dandachi]

as copper is a better conductor

Yeah exactly.

 

[nehaloo]

hw come temp rise will increase?? :/ i think it will decrease since it is a good conductor of heat so heat will be lost to the surroundings :/!!

 

[Nawaf Dandachi]

which reaction was it?....i wrote displacement

DOUBLE displacement

 

[Ahmed GolD]

I

yeah i wrote melting point too , i think its correct because that is whats written in my notes

WRONG, I wrote chromatography and it's 100% correct. Check this http://www.scribd.com/doc/8071912/Caffeine-Extraction

 

[EpicLol]

It was single displacement, and for the steel quesion, do we need to measure masses? cant we like just see and tell? because I did not mention masses how many marks would I lose for that out of 7?

 

[svenas]

Temperature rise will increase because copper is a good conductor of heat.

ok for the second graph my plots were all correct but my line is wrong and my value is correct 14cm3 ,how much can I get here out of 7 marks

 

[Nawaf Dandachi]

The second graph is line of best fit. 2 points may not intersect.

 

[ѕ.ɢ сяуѕтᴀʟѕ]

the boling thingy/??

yea tht one any idea abt the answer?

 

[Nawaf Dandachi]

ok for the second graph my plots were all correct but my line is wrong and my value is correct 14cm3 ,how much can I get here out of 7 marks

I don't know. You might get plotting and reading marks correct. but not for the connecting and 2 STRAIGHT LINES. the next question depends on your graph, you should get a value between 13 and 14.

 

[Moca]

I
WRONG, I wrote chromatography and it's 100% correct. Check this http://www.scribd.com/doc/8071912/Caffeine-Extraction

it can be melting point or chromatography doesn't mean melting is wrong

 

[EpicLol]

and for the steel quesion, do we need to measure masses? cant we like just see and tell? because I did not mention masses how many marks would I lose for that out of 7?

 

[Nawaf Dandachi]

yea tht one any idea abt the answer?

Boiling, To reach crystallization point. Helps dry the mixture and remove water of crystallization. Obtain crystals. Followed by filtration.

 

[nehaloo]

is chromatography a correct answer?? :/ since those crystals r soluble in a solvent which was given!

 

[Nawaf Dandachi]

it can be melting point or chromatography doesn't mean melting is wrong

Yeah it's Melting Point. plus it's just one mark.

 

[svenas]

I don't know. You might get plotting and reading marks correct. but not for the connecting and 2 STRAIGHT LINES. the next question depends on your graph, you should get a value between 13 and 14.

I joined first straight line correct and found value of 14cm3 but my second line isn't correct

 

[thats_me]

yea tht one any idea abt the answer?

yea i guess its that it becomes saturated forming powder or anhydrous..

 

[Nawaf Dandachi]

is chromatography a correct answer?? :/ since those crystals r soluble in a solvent which was given!

Melting point is more appropriate. Can you do Chromatography for your table salt? Plus it's solid. Chromatography basically for solutions.

 

[Nawaf Dandachi]

I joined first straight line correct and found value of 14cm3 but my second line isn't correct

you might get credit for everything but the second line. it's okay. as long as it's only worth 2 marks.

 

[Micro961]

Exothermic is also write for chemical reaction. I'm definetly sure about it.

 

[svenas]

you might get credit for everything but the second line. it's okay. as long as it's only worth 2 marks.

so can I get 5/7