MATH 42 AND CHEMISTRY PAPER 61 DOUBTS

[f.mohamed]

Thank u & best of luck

use cosine rule whn agjasent sides and between angle given
use sine rule whn 2 sides and opposite angle givn or 1 side and 2 angles given

 

[princess sofia]

Thank u & best of luck

u r welcome n best of luck

 

[princess sofia]

(ii) pleaseView attachment 41671

 

[dubi2pro]

anyone?
e3, full question of cirlce
and c5,jpg

only the (b) last part iii

 

[qassem babel]

Guys, I am freaking out, do you believe that it will be extremely hard or easy? And I freaking out since I fear that it was difficult as paper 22 was easy and didnt contain anything difficult such as circle theorem.

 

[princess sofia]

Guys, I am freaking out, do you believe that it will be extremely hard or easy? And I freaking out since I fear that it was difficult as paper 22 was easy and didnt contain anything difficult such as circle theorem.

it may be a freaking paper for all the major topics r gonna cme in paper 42 nw , anyways hope 4 the best

 

[f.mohamed]

Guys, I am freaking out, do you believe that it will be extremely hard or easy? And I freaking out since I fear that it was difficult as paper 22 was easy and didnt contain anything difficult such as circle theorem.

Same here I am freaking out too ! But we should just try to do our best, it doesnt depend on the exam if it was hard or easy it depends on how u studied, so just do your best and good luck

 

[f.mohamed]

ehem, i hope... paper 22 was damn easy, but does that really mean paper 4 would be hard? I want an A* so bad :/

I want an A* too.... But i guess i wont get one though Idk if it will be hard or not but we still have to hope for the best and study well we dont have much time left !

 

[f.mohamed]

yup....
and im stuck with these doubts and i have no idea when will i possibly get a reply. :/

I wish i could help....... believe me i am really terrible at many things plus i am really really sick and i just cant drop out those exams

 

[f.mohamed]

awwh. get well soon. it's okay

thank u

 

[qassem babel]

I feel sad for the people who have french exam paper 1 and paper 4 on monday too

 

[s.i.d.d.h.a.n.t._3.1]

I feel sad for the people who have french exam paper 1 and paper 4 on monday too

that's me

 

[qassem babel]

Hahahaha good luck man!

 

[dubi2pro]

Whats the test for:

Starch
Proteins
Glucose?

identifying them?

 

[dubi2pro]

Starch: Add few drops of iodine solution it changes colour from brown to blue black
Proteins: Biuret test: Add Potassium hydroxide followed by copper sulphate, colour changes from blue to pink/purple/mauve/lilac
Glucose test or reducing sugar test: Add few drops of Benedict's solution (which is a copper salt solution and so has a blue colour) and then heat it. Colour changes from blue to green to yellow to orange to red (according to the concentration)
Precautions for Benedict's test:
1. Preferable to use a water bath, and not heat directly.
2. Wear goggles, laboratory coat and tie your hair.
3. Do not fill more than half of the test tube to avoid splashes.
4. Distance the test tube from your face

thanksss

 

[s.i.d.d.h.a.n.t._3.1]

Whats the test for:

Starch
Proteins
Glucose?

identifying them?

Starch- Add iodine, colour changes to blue-black
Protein- Add biuret solution, turns purple
Glucose- Add benedicts solution, heat it, colour changes to orange

 

[Student_Learner]

Pleaaaaaaaase help me with this stuff someone!
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w13_qp_41.pdf
Call me dumb but I've been stuck on it for ever!
All the questions are from this paper itself..
Questions : 4 d
10 v
I'd be really grateful!

 

[mohabxD]

help please?
0580/42/O/N/13

question 6

part (b)(iii)



thanks...

 

[LittleEarthling]

may/june 2011 p 42 question - 9 (c) - HELP NEEDED !