Chemo P5 tips

[mizmoody]

can someone please tell me howw to draw the apparatus for M/J/10/52.. please!

 

[angelgirl:)]

ok ppl iam shifting to AS p2 discussion side ....Saudha cud u come there too....i guess its enough for us to give this much time for p5...now its time for p2

 

[angelgirl:)]

ok ppl iam shifting to AS p2 discussion side ....Saudha cud u come there too....i guess its enough for us to give this much time for p5...now its time for p2

saudha only...

 

[saudha]

ok ppl iam shifting to AS p2 discussion side ....Saudha cud u come there too....i guess its enough for us to give this much time for p5...now its time for p2

k

 

[candid24hours]

What is the best apparatus that can be used to find volume of gas, one which is workable and convenient. All I know is that there are two kinds of arrangements that can be employed: first, where we use thistle funnel and conical flask and second, where we use a small test tube containing for example an acid and we tilt it towards a strip of metal for the reaction.
Please kindly elaborate on this. I might not be totally right about this. But help.
Thanks. =)

Somebody PLEASE reply to my above question. Its basic! C'mon somebody must know! =/

 

[ousamah112]

Somebody PLEASE reply to my above question. Its basic! C'mon somebody must know! =/

use a syringe ..

 

[larina]

can someone please tell me howw to draw the apparatus for M/J/10/52.. please!

- 250cm3 conical flask with potassium chloride in it
- 0-100 degree Celsius range thermometer
- thermometer in [KCl] not touching the edge or bottom of the flask
- conical flask on top of tripod and gauze
- under the tripod is Bunsen burner...

 

[larina]

can some one tell how to prepare 250cm of 0.1 of aqueous lead nitrate

1 molar= Mr in 1000cm3
for e.g the mass used here is Pb(NO3)2 ......this question came in O/N 10
so, 1 molar of Pb(NO3)2= Mr of Pb(NO3)2 in 1000cm3
1 molar = 331
0.1 molar = x
u cross multiply and get x as 33.1
then,
33.1= 1000cm3
x= 250cm3
cross multiply and u'll get x as 8.3g
mix 8.3grams of Pb(NO3)2 with small amount of water (MUST BE LESS THAN 250cm3)
make sure all the solid is dissolved....transfer the solution and all its 'rinsings' into a 250cm3 volumetric flask, add water till the 250cm3 mark
shake to mix the solution


hope u got it, im not good in explaining though...

 

[miss irfan]

can someone please tell what the examiner means by "use a range of atleast 40 degrees"

 

[hassam]

a useful RULE OF THUMB
Reference to ‘hot’ apparatus, not Bunsen or water......meaning bunsen burner shud never be identified as a hazard!!!

 

[hassam]

TIP...
WEHNEVER EXPERIMENT OF TEMP. ON RATE OF RXN
must equlibirate both solutions to be mixed for reaction to water bath temperature ~!!!!

 

[miss irfan]

TIP...
WEHNEVER EXPERIMENT OF TEMP. ON RATE OF RXN
must equlibirate both solutions to be mixed for reaction to water bath temperature ~!!!!

can someone please tell what the examiner means by "use a range of atleast 40 degrees"
whats meant by range here?

 

[Ayaaa]

as in you have to use diff temp in ur exp ranging for example from 10 Celsius to 50
thats when u have temperature as ur independent variable

 

[hassam]

one more tip
let say u are running a decomposition experiment .....then the possible errors cud be SOLID BLOWN OUT DUE TO NOT HEATING GENTLY........and INSUFFICIENT HEATING SO NOT FULLY DECOMPOSED........the point of overheating does not applies everywhere....cos some residue salts require too high a temperature to be decomposed......
one more thing.....to avoid insufficient heating as an error.....then MAKE SURE U ARE HEATING TO CONSTANT MASS

 

[farhan94]

can anybody explain the divided reaction vessel for an exp involving evolution of gas??????plz qiuckly...P5 is tomorrow...............

 

[hassam]

yea i dont saw at actually .....bt there is a partition in the concial flask between solid and and liquid....so when u shake the flask the partition wall falls down
one USEFUL TIP....
Whenever dealing with hydrogen or other flammable gases in any experiment....safety precaution is too keep away from flame...or else an explosion

 

[lewis_neu]

hello frens plz help me in the question of of p 53 of M/J 2011 Q no (1) (c) .. how do you draw the diagram of the apparatus.. i'm really confused with how to draw a water bath and i'd be really glad if someone would right away help me out.. and how do we actually fix the apparatus to get the time for the rate of the reaction (how do u actually use the x-marked paper below the conical flask when u have to keep the tempr constant by using the waterbath) ?? i'm really confused with this one.. and to really say i've never seen a diagram of a waterbath so please as for a sample, help me out guyzz !

 

[ousamah112]

hey... wht is best appratus to collect a gas above water ..like oxygen???

 

[hassam]

just past hee gas through a beaker containing water where an inverted bureette containing water has been placed

 

[Paradoxical]

Hey, does anyone have the ER for chemistry O/N 2011? If so, could you please upload it? Thanks!