Chemister & Physics Paper 3

[afoo.666]

Chemo.

 

[hela]

Chemo.

chem is over since long time
what about physics 31 any idea about instrument required

 

[afoo.666]

Q1 is electricity. And other one is about the clamp stand.

 

[afoo.666]

Its gonna be easy, dw. Hope you know about the Limitations/Improvements wala part.

 

[ShaiqUddin]

Most chances are that Q1 would be Rheostat (Variable Resistor) & Q2 would be Newton Meter (Clamp Stand)... make sure u know abt these instruments!

 

[afoo.666]

Yup. Those were the questions.

 

[aleezay]

Could anyone PLZ post the marking scheme for chemistry p31 specimen paper 2007? Thanks in advance

 

[aleezay]

Secondly,
3. Do nitrITES not give NO2 on decomposition?
2. Is the error in titre (any volume added by a burette) 0.05cm^3 or 0.1cm^3?

 

[Waleed Amjad]

Secondly,
3. Do nitrITES not give NO2 on decomposition?
2. Is the error in titre (any volume added by a burette) 0.05cm^3 or 0.1cm^3?

-Nitrates give NO2 on decomposition and Nitrites do not.
-the uncertainty of burette is 0.05 cm^3 (i.e - smallest division is 0.5 (between 0 and 1) so smallest division divide by 2 will give u its uncertainty which is in this case is 0.5/2 = 0.05 cm^3