Chemo P5 tips

[hassam]

http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_w10_qp_51.pdf
q2 part d bat anomalies......isnt it rong to say temp. taken b4 freeaing was complete.....it shud have been that temp. taken b4 freeaing started cos during freeazing temp. remains consstant.....so it is only b4 start or after completion we ll get a temp other than the true freezing point

 

[hassam]

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

link is in the forum.......chek the announcements thread

 

[hassam]

TIP
do not say more collisions as the reason for increase in rate of rxn.....rather say greater COLLISION FREQUENCY!!!

 

[hassam]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_52.pdf
Question 1 part c......smbody tell me what to use to heat the solution bt not to overheat.....and how to position the thermometer
aslo dint understand positioning of thermometer

 

[aliya_zad]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_52.pdf
Question 1 part c......smbody tell me what to use to heat the solution bt not to overheat.....and how to position the thermometer
aslo dint understand positioning of thermometer

Anti bumping Granules are added to prevent over heating..

The rough edges of an anti-bumping granules prevent bumping when you boil a liquid.
When you boil a liquid in a vessel,bubbles of vapour form around rough areas.
If a liquid is boiled in very clean, smooth glassware it can be difficult for bubbles of vapour to form. Suddenly, one large bubble of vapour forms disturbing the boiling liquid violently. This causes bumping, and is hazardous.
So to avoid this bumping you need to add anti-bumping granules.

 

[RGBM211]

mmm q1 e) how should the column headings be
http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_w11_qp_53.pdf
http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_w11_ms_53.pdf

 

[Paradoxical]

This might help anyone having problems in M/J 2007 Q1 (magnesium and hydrochloric acid reaction)
http://www.nuffieldfoundation.org/practical-chemistry/rate-reaction-magnesium-hydrochloric-acid

 

[Paradoxical]

Seeing as paper 5 counts for 12% of the overall A-Level, could I still manage an overall A in chemistry if I got something like a C in paper 5? I got an A in AS.

 

[smzimran]

Can someone show me the diagram for a waterbath ?
Plz

 

[Paradoxical]

Guys, I would be eternally grateful if someone could upload their solved paper 5s, because I'm really having a problem with understanding the mark schemes. Please!!

 

[soul1]

Can someone show me the diagram for a waterbath ?
Plz

http://www.elateafrica.org/elate/biology/nutrition/studentactivities2.jpg

It's that big beaker full of water/

Please google before asking (i.e: make some effort).

 

[smzimran]

I got one!

 

[smzimran]

http://www.elateafrica.org/elate/biology/nutrition/studentactivities2.jpg

It's that big beaker full of water/

Please google before asking (i.e: make some effort).

Thanks but no thanks,
Already did

 

[smzimran]

Guys, I would be eternally grateful if someone could upload their solved paper 5s, because I'm really having a problem with understanding the mark schemes. Please!!

Have you seen the paper solved by princess zahra ?

http://www.xtremepapers.com/community/threads/physics-chemistry-bio-p5-help.14696/#post-253493

Sadly i dont have a scanner right now, i have my mock paper in which i got full marks
(nov11 variant3)
But .......

 

[user]

Assalamoalaikum wr wb!!

Well...can somebody tell me the normal apparatus available in the lab...i mean their volumes...cuz we have to mention the volumes of the apparatus we use..right?
like 250cm^3 beaker etc..?! plz......

 

[larina]

Assalamoalaikum wr wb!!

Well...can somebody tell me the normal apparatus available in the lab...i mean their volumes...cuz we have to mention the volumes of the apparatus we use..right?
like 250cm^3 beaker etc..?! plz......

250cm3 beaker
100cm3 conical flask
16cm3 test tube
25cm3 boiling tube
100cm3 graduated gas syringe
0-100 degree Celsius graduated thermometer

 

[Paradoxical]

Have you seen the paper solved by princess zahra ?

http://www.xtremepapers.com/community/threads/physics-chemistry-bio-p5-help.14696/#post-253493

Sadly i dont have a scanner right now, i have my mock paper in which i got full marks
(nov11 variant3)
But .......

Yea, I have that one. Thank you anyway! I just have to hope there's someone out there who has a scanner and is willing to upload their papers!

 

[optimistic]

GUYS I NEED URGENT HELP IN THESE QUESTIONS.i don't understand how we can explain the anomalies in Q2 of this paper http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_s11_qp_52.pdf
How will we find the concentration of the succinic acid in both the water and ether layer in Q2
http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_w10_qp_53.pdf

 

[extremeranger]

extremeranger
plz can u solve my doubt on the other thred i have posted...tips for bio,chem ,phy p5...

From your graph, you find the mass/100g (solubility) at T= 85C and then the mass at T=35C
Divide both masses by 2 because in the graph, the solubility is in mass/100g and in the question we'r dealing with 50g of potassium chlorate. So now subtract the 2 masses and you get the mass that precipitates out during the temp change.

 

[angelgirl:)]

From your graph, you find the mass/100g (solubility) at T= 85C and then the mass at T=35C
Divide both masses by 2 because in the graph, the solubility is in mass/100g and in the question we'r dealing with 50g of potassium chlorate. So now subtract the 2 masses and you get the mass that precipitates out during the temp change.

ohhh ok..soin the graph its out of 100...i didnt see that part...thanks...