Chemo P5 tips

[AN10]

lol most of the people i know drew a line....sigh line of best fit probably means straight line

 

[samy]

i also drew acurve..as most papers had curbes for the solubility question even if the ques stated for a best fit line..
though i made a mistake...wrote exo instaed of endo :S..!!!

and for the exp is water bath okay for different temperatures???

 

[zeebujha]

yeps, I guess so. But we had to realise that a curve can also be a line of best fit. Question 2 or P52 was pretty different from the previous papers

 

[samy]

well i waxnt liking the staright line lol it wax very ajeeb si
so instead i drew a curve..

can u tell about the experiment??

 

[ParanoidAleveler]

yea.. it had to be a curve.. or else they would've mentioned "straight line" in BOLD
*sighhhh* so that means i lost marks for the anamolous points too

how did u guys do the calculation bit?

 

[MukeshG93]

Value for the loss in mass when reducing the temperature from 85 to 35?? I got a total loss of 14g. What did you guys get? And yes, it has to be a curve, as solubility can NEVER be negative, it cannot be a straight line because the solubility will only fall to zero at 0 K (absolute zero). So yes, it would have to be a curve with the x-axis being its asymptote.

 

[zeebujha]

I got 14.00 g

 

[HarisShahzad]

line of best fit is a straight line, google it if u dont believe me

 

[WellWIshER]

line of best fit is a straight line, google it if u dont believe me

yes ITS NOT A CURVE OF BEST FIT !!!

 

[MukeshG93]

Come on people! What rings more of a bell in mind: solubility line or solubility curve? Google both, let's see what you get

 

[WellWIshER]

i one of da past papers da one with transition temp said drw 2 lines but actually one of them was a curve...

so a curve rings drums!!!! to my ear.

 

[zeebujha]

ER of Physics M/J 2010 P2 clearly states that: examiners were surprised to find a firmly ingrained belief in candidates that the line of best fit couldn't be a curve. I think the same thing is playing out here.

 

[zeebujha]

i one of da past papers da one with transition temp said drw 2 lines but actually one of them was a curve...

so a curve rings drums!!!! to my ear.

you are absolutely right my friend. I had bungled that paper by drawing two straight lines!!!

 

[MukeshG93]

i one of da past papers da one with transition temp said drw 2 lines but actually one of them was a curve...

so a curve rings drums!!!! to my ear.

you are absolutely right my friend. I had bungled that paper by drawing two straight lines!!!

Speaking of bungling, I am another victim of the straight line syndrome right here. It was just today that I learned to let go of that stereotype.

 

[mr_perfect]

i got 82% in AS Chem. if iget a D in P5 component and manage to get an A/B in P4 component can i score more than 80% in A2 ??????

Plz REPLY ASAP

 

[mr_perfect]

plz give tips on how to manage time on Paper 5 . most often i cannot finish two questions. this way ill end up getting a C . plz help

 

[angelgirl:)]

When using a magnesium ribbon or any dirty surface, clean it with SANDPAPER

y sand paper...?

 

[saudha]

ok anglegirl where do u want me to start from??

 

[angelgirl:)]

When you have to remove moisture from :

1. Surface:
Wash the surface with a stream of propanone. The water gets dissolved in the propanone and repeat it multiple times. Then gently heat the surface to evaporate the propanone from the surface

2. Vapour:
Use dessicants such as:
1. ANHYDROUS sulphuric acid
2. ANHYDROUS calcium chloride
3. Silica gel
You have to pass the vapour from the beaker containing the dessicant

Also, a useful property of soda lime is that it absorbs BOTH water vapour and carbon dioxide

isnt moisture and vapour the same thing...so if we pass vapour through these anhydrous substances wont the vapour too
get dissolved in it...?

 

[angelgirl:)]

ok anglegirl where do u want me to start from??

i dont know? lol u tell me...iam just goin through the points right now...and u do the same thing..