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Physics, Chemistry and Biology: Post your doubts here!

Z

za Shadow

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Wasif` said:
For CHEMISTRY PAPER 6 TO GET A*, STUDY :-
1. All the labeling and names of apparatus
2. Learn and revise CATION AND ANION again and again
3. Preparation of soluble salt, insoluble salt, titration and Precipitation method (step by step which gives examiner a good impression and sometimes bonus marks)
4.Reaction of Acid with basis , carbonate, salt
5. Learn pH scale by color and example of strong or weak acid
6. Chromatography, filtration, Crystallization, to separate solvent from solution by distillation, Fractional Distillation
7. Rate of Reaction and effect of increasing surface area, concentration, temperation, suitable catalytst and light
8. Photography by Silverbromide and Photosynthesis equations
9. Equilabrium and Energy change in reversible reaction
10. Solid, liquid and gasses states and properties.

GOOD LUCK EVERYONE :)
Click to expand...

thanks :)
 
Z

za Shadow

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helppppppp URGENT PLEASE HELPPPPPP :cry: :cry: :cry: :(

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_63.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_63.pdf
question 5 e) why its non transition it should be transition

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_61.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_61.pdf
q 6 will my answer be correct if i wrote about crystalization and at the end i wrote that after drying them between 2 wads of filter paper put them on an electic balance....if its wrong tell me why plzzzzz

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_62.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_62.pdf
q 6 the last point is "calculate the concentration" how do we calculate the concentration???????? and should we write the steps of the calculation in this question ?????

ALL I NEED IS HELP PLZZZZZZZ HELP ME I NEED U GUYS:cry::cry::cry:
 
M

Manobilly

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za Shadow said:
helppppppp URGENT PLEASE HELPPPPPP :cry: :cry: :cry: :(

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_63.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_63.pdf
question 5 e) why its non transition it should be transition

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_61.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_61.pdf
q 6 will my answer be correct if i wrote about crystalization and at the end i wrote that after drying them between 2 wads of filter paper put them on an electic balance....if its wrong tell me why plzzzzz

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_62.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_62.pdf
q 6 the last point is "calculate the concentration" how do we calculate the concentration???????? and should we write the steps of the calculation in this question ?????

ALL I NEED IS HELP PLZZZZZZZ HELP ME I NEED U GUYS:cry::cry::cry:
Click to expand...
For O/N 2011 PAPER 62 you donot have to mention the step for concentration just write that calculate it

The other I am just going to answer nw ,i answered this question as I just solved it now.
 
M

Manobilly

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Manobilly said:
For O/N 2011 PAPER 62 you donot have to mention the step for concentration just write that calculate it

The other I am just going to answer nw ,i answered this question as I just solved it now.
Click to expand...
To question 6 paper 61 you have to reweigh it they have mentioned it there that means you can put on electric balance.
 
M

Manobilly

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za Shadow said:
helppppppp URGENT PLEASE HELPPPPPP :cry: :cry: :cry: :(

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_63.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_63.pdf
question 5 e) why its non transition it should be transition

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_61.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_61.pdf
q 6 will my answer be correct if i wrote about crystalization and at the end i wrote that after drying them between 2 wads of filter paper put them on an electic balance....if its wrong tell me why plzzzzz

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_62.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_62.pdf
q 6 the last point is "calculate the concentration" how do we calculate the concentration???????? and should we write the steps of the calculation in this question ?????

ALL I NEED IS HELP PLZZZZZZZ HELP ME I NEED U GUYS:cry::cry::cry:
Click to expand...
For paper 63 just mention it is a carbonate ,and write metal no need to go in detail dude ,its transition or whatever,write a metal name okey ,transition was mentioned as Iron in it.
 
sma786

sma786

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za Shadow said:
helppppppp URGENT PLEASE HELPPPPPP :cry: :cry: :cry: :(

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_63.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_63.pdf
question 5 e) why its non transition it should be transition

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_61.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_61.pdf
q 6 will my answer be correct if i wrote about crystalization and at the end i wrote that after drying them between 2 wads of filter paper put them on an electic balance....if its wrong tell me why plzzzzz

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_62.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_ms_62.pdf
q 6 the last point is "calculate the concentration" how do we calculate the concentration???????? and should we write the steps of the calculation in this question ?????

ALL I NEED IS HELP PLZZZZZZZ HELP ME I NEED U GUYS:cry::cry::cry:
Click to expand...

Question 5 (e) = non transition , because solid E is calcium carbonate .. so calcium is NOT a transition metal ..
Question 6 = every markscheme since 2002 has this way of measuring the volume, so learn this :) its better
Question about concentration = its the same as the above
 
M

MNU

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sma786 said:
well, thats weird =\ maybe its because the water is not touching the iron fillings, and just the water vapour will reach there.. yup thats a logical explanation i thnk ..
Click to expand...
yeah i think u're right!! thanx a lot!!
 
AAnsarii

AAnsarii

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mrnt3250 said:
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s11_qp_62.pdf
Question 5, I totally get scared when I see this type of questions, and they always come.
I couldn't figure out whats the solid, etc.
So could you tell me what shall I study for this question? I have studied Testing for anions/cations (sulfate ions/carbonate ions/nitrate ions), Identifying gasses, Metal ions, etc..
Click to expand...
W is soluble ammonium cloride (qn) so fltrate will b this n v is insoluble so satys on fltr ppr
dilute nitric acid+silver nitrate is 4 halides, it has chlorine(read d qn) and will thus have a white ppt
ammonium is also present, so adding NaOH and heating will release ammonia, which turns damp red litmus ppr blue
the third is 4 sulphates, sulphate isnt present, so no ppt/observation....

(c)sshows CO3- as carbondioxide is released
 
1

1D123

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guys what about the last question in every paper i have problem in that,help anyone?
 
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