Biology; Chemistry; Physics: Post your doubts here!

[kirann]

Heres a trick on making esters I attached it

MR FeSO4 = 56 + 32 + (16*4) = 152
1 mol FeSO4 =152
for o.o223 : 0.0223*152 =3.39

thankks..

 

[The Chill Master]

for chemistry tips and notes
https://www.xtremepapers.com/community/threads/all-things-u-need-to-know-about-chemistry-p6.33395/

 

[princess Anu]

Volumteric is calibrated

The shape is same?

 

[princess Anu]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s13_qp_41.pdf


Q8 part j ? :/ I know the answer but I need to know how to get it

part K?

 

[Mahnoorfatima]

See we have NaOH in the flask. HCl is in the burette. According to student 4, more HCl is needed to neutralize the NaOH, which means there is more NaOH. Cleaning the flask with NaOH will result in more NaOH and thus the ans is B

Why can't it be c? :/

 

[princess Anu]

Q on Limiting Reagent:
1g of Na was added to 100g of water. what mass of solution remains at the end of the reaction?
Can somebody show the working

 

[Maganius]

Question 5 anyone??????????????
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_w05_qp_4.pdf

(B)
The flask was washed out with aqueous NaOH increasing its amount, causing more acid being used for titration.

 

[FLRNAB]

http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_w12_qp_42.pdf

Question 10. Part A
Is the graph supposed to be like this?

 

[asadalam]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_w12_qp_42.pdf

Question 10. Part A
Is the graph supposed to be like this?

Did you draw this using french curves?

 

[FLRNAB]

Did you draw this using french curves?

Yes

 

[Tuba noor]

http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_w13_qp_42.pdf
question 9 , part d(i)
how we have to find the values?

 

[Awesome12]

Yes

I just got one today. They are allowed in the exam, right?

 

[FLRNAB]

I just got one today. They are allowed in the exam, right?

Yeah I took them to the Physics ATP and no problems.

 

[Awesome12]

Yeah I took them to the Physics ATP and no problems.

Awesome

 

[saaara]

can someone tell me why did they say its ''not chloride'' why its not bromide or iodide in http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s06_qp_6.pdf QUESTION 5 PART E

 

[***amd***]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_w13_qp_42.pdf
question 9 , part d(i)
how we have to find the values?

 

[saaara]

can anyone please answer my question

 

[Tuba noor]

View attachment 42152

sorry i dnt get you please explain?

 

[exploded diper]

Can some one explain the ans of q:10 f....of mayjune 2010....(5070)

 

[Muhammad Saad :)]

what is the exact number of significant figures we should round are answers in gce chem atp e.g 0.006875757 ---> 0.00687