Chemistry: Post your doubts here!

[♣♠ Magnanimous ♣♠]

No probs

Thankk youuu !!

 

[Abdel Moniem]

I Scored a U in chemistry AS practicals although my components for paper 1 and 2 were an A and a B. I practiced Paper 3 a lot and yet me and all of my friends scored the same grade. Can anyone give me some tips to follow to score an A grade or a B grade for my paper 3

 

[♣♠ Magnanimous ♣♠]

I Scored a U in chemistry AS practicals although my components for paper 1 and 2 were an A and a B. I practiced Paper 3 a lot and yet me and all of my friends scored the same grade. Can anyone give me some tips to follow to score an A grade or a B grade for my paper 3

https://www.xtremepapers.com/commun...ok-free-download-post-your-doubts-here.33074/

 

[Abdel Moniem]

https://www.xtremepapers.com/commun...ok-free-download-post-your-doubts-here.33074/

Thank you so much

 

[♣♠ Magnanimous ♣♠]

Thank you so much

No probs

 

[savera]

hi ,
for an example
http://www.cie.org.uk/images/157296-november-2012-question-paper-43.pdf
question number 7 iii

I can solve the 7 i and ii
and from the question i know there will have 2 -CH3 group and 2-CH2 group
and one of the element beside C and H is O

and according to chemical shift ,
there is some group in ~around 1 and 2.5
but everytime i cant find something fit to information

here is the data booklet :
http://fmcapechemistry.weebly.com/uploads/5/6/3/3/5633072/chem_data_booklet.pdf

Sorry but I hav

hi ,
for an example
http://www.cie.org.uk/images/157296-november-2012-question-paper-43.pdf
question number 7 iii

I can solve the 7 i and ii
and from the question i know there will have 2 -CH3 group and 2-CH2 group
and one of the element beside C and H is O

and according to chemical shift ,
there is some group in ~around 1 and 2.5
but everytime i cant find something fit to information

here is the data booklet :
http://fmcapechemistry.weebly.com/uploads/5/6/3/3/5633072/chem_data_booklet.pdf

Sorry I cant help you, because I havnt done the applications part. I thought you were talking about the electrolysis part. So sorry I couldnt help you.Hope you find what your looking for.
btw have you complete the A2 syllabus.

 

[loveyuan]

Sorry but I hav

Sorry I cant help you, because I havnt done the applications part. I thought you were talking about the electrolysis part. So sorry I couldnt help you.Hope you find what your looking for.
btw have you complete the A2 syllabus.

Yeah completed . I have A2 exam coming soon .

 

[Wolfgangs]

Can someone please answer and explain each part? I'm still not understanding how to use equations in relation to moles.

 

[Yogita.T]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w10_qp_31.pdf

Hi can someone please help solve the numericals of this paper?

Specifically Q1 - c... (i) (ii) (iii) (iv)
Thanks

 

[Metanoia]

Can someone please answer and explain each part? I'm still not understanding how to use equations in relation to moles.

ii) moles of KOH used = vol. of KOH solution x conc. of KOH solution = 0.01 dm^3 x 2 mol dm^-3 = 0.02 mol

iii) from equation
mol of Al : mol of KOH
2 : 2

Therefore, 0.02 mol of KOH would react with 0.02 mol of Al.

iii) mass of Al reacted = moles of Al x Ar of Al = 0.02 x 27 = 0.54 g

 

[Neoh Kai Qin]

9701 ON01 Marking Scheme?!!???

 

[mustaf]

when testing for salts are we supposed to shake the test tube to make the salt dissolve o will dissolve by its self

 

[Awesome12]

Why do the 3d orbitals have more energy than the 4s orbitals? I do know that it is due to the Auf-Bau Principal, but if such a question comes in the exam, what explanation am I supposed to give?

 

[asadalam]

Why do the 3d orbitals have more energy than the 4s orbitals? I do know that it is due to the Auf-Bau Principal, but if such a question comes in the exam, what explanation am I supposed to give?

Is it in the syllabus?

 

[Awesome12]

Is it in the syllabus?

I don't know.

 

[princess Anu]

Can somebody please help me with these MCQ's:
nov 04
question 34 : Why isn't 1 correct too? The tips represent Noble gases right? and Group 8 can be called Group 0, no?
May 05
Question 3 : Why isn't it D? ( answer is C)
Question 14
Nov 05
Q3 , 14

 

[DeViL gURl B)]

Hey guys,
I'm looking for some summary sorta notes for the last 3 Alevels chapters that are:

-> chemistry of life
-> Application of analytic chemistry
-> Design and material
I'm mostly weak in the section B of paper 4
It'd be of great appreciation to get any help
Thank you

 

[Metanoia]

Can somebody please help me with these MCQ's:
nov 04
question 34 : Why isn't 1 correct too? The tips represent Noble gases right? and Group 8 can be called Group 0, no?
May 05
Question 3 : Why isn't it D? ( answer is C)
Question 14
Nov 05
Q3 , 14

Nov 04
Qn 34: The marking scheme says all statements are correct. So statement 1 is also correct.

May 05
Qn 3: Element in D belongs to Group V (the huge increase in IE is from the 5th to the 6th IE)

Qn14: Reactivity of Group II metals increases down the group , calcium is more reactive than magnesium.

 

[princess Anu]

Thankyou, would you please explain Q13 of May June 05 and those of Nov 05 too?

 

[zohaib6199]

Does Any one have notes for as level chemistry practical notes orli