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why this sequencelys-val-ser-ala-gly-ala-gly-asp ?
Actually with out catalyst you need two steps to convert ally alcohol into propanal, while when you use catalyst they both oxidation and reduction happens.How does oxidation and reduction occur when ally alcohol is converted into propanal using a ruthenium catalyst
I know its because of the size.But why? :/the marking scheme says it all
something like this
sorry coundnt do an exact drawing but i guess will now understand what the ms says
pH of a buffer is pKa so apply the formula pH=pKa+log10(salt/acid)= 7.2+ log10(0.002/0.005) =6.8 understood?Question 2c(iii)
Find PH
This stuff isn't in the syllabus or taught. This is precisely why it has shown you the 4 figures above the actual question. The examiner wants you to analyze those figures, see whats going on, and apply THAT to the question.Can someone please thoroughly explain Question 5.a)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_42.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_qp_21.pdf
q4 (c) (d) (e) can someone explain in detail please?
I know its because of the size.But why? :/
this would make more senseWell i guess its cause Cl^- is smaller than I^-
So fitting 7 atoms of F around a Cl atom is difficult due to a lot of repulsion between the electrons.
But cause an I atom is bigger it can attach to 7 F atoms easily
okay.I see some things in chemistry are not very logic basedthis would make more sense
you know that electrons repel so more the place the have future away they will be and more the stable than being in tiny place
think of a lot of people in a car they would argue to get 1 full seat and no one to sit next to them but if you have a bigger car more places to sit....this is just an example
How did you come to that conclusion , what i know about pka that its given by -log ka .. why pka is ph of buffer?pH of a buffer is pKa so apply the formula pH=pKa+log10(salt/acid)= 7.2+ log10(0.002/0.005) =6.8 understood?
a free radical has one unpaired valence electron which gives it high reactivity.Help in following questions
1)http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w10_qp_23.pdf
Question 3 a-ii)
2)http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_21.pdf
Question 3 d)
3)http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_22.pdf
Question 3 c)
4)http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_23.pdf
Question 4 c-ii)
Suchal Riaz
P1 > 32-34 mostlyhow much marks do we need to score to get an A in Chem P1 and P2?
As sitoon said:how much marks do we need to score to get an A in Chem P1 and P2?
As sitoon said:
P1 > 32-34 mostly
P2 > 48 &above
But it also depends on number of other factors. Especially the marks curve or such in your area. If many people didn't score high marks or most of them have low marks then the curve will go down, i.e. you might need less marks to score an A in p1 it might be 25 or more.
Curse is like some sort of chart depending on your grade and all other candidates in your area grades/marks. If the average mark per candidate is low then the, marks for getting A will become low. If they are high, then for getting A you might need higher marks.
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