Chemistry: Post your doubts here!

[NIM]

Thnx again dude!!

 

[Studydayandnight]

Guys, for a question which asks to calculate the percentage error, how do we do that? (In the practical paper)

 

[nehaoscar]

Guys, for a question which asks to calculate the percentage error, how do we do that? (In the practical paper)

You mean percentage uncertainity?
It's the error in equipment divided by your answer multiplied by 100
(error/actual answer) x 100

Please can you give an example - like from which years paper?

 

[Mahnoorfatima]

Is the MAX error of a single burette reading o.05 or 0.1?

 

[BhaiArshad]

Is the MAX error of a single burette reading o.05 or 0.1?

0.05

 

[Mahnoorfatima]

If someone has any Tips or notes for calulations please post them ASAP!

 

[Mahnoorfatima]

0.05

Then what is 0.1??

 

[Studydayandnight]

You mean percentage uncertainity?
It's the error in equipment divided by your answer multiplied by 100
(error/actual answer) x 100

Please can you give an example - like from which years paper?

Like this one.http://maxpapers.com/wp-content/uploads/2012/11/9701_s14_qp_33.pdf

It's in the second experiment, c (i)

 

[Studydayandnight]

Thermometer.

Isn't the maximum error 1 in a thermometer?

 

[BhaiArshad]

Isn't the maximum error 1 in a thermometer?

Then what is 0.1??

 

[Studydayandnight]

So 0.5 for a thermometer and 0.05 for a burette right?

 

[BhaiArshad]

Then what is 0.1??

So 0.5 for a thermometer and 0.05 for a burette right?

Yes,

 

[sj0007]

Can some one help me with this PLZZZZZZZZZZZZZZZZZZZZZ!!!!!!!!
It is from May June 2010 Paper 42 Question 3(d)

 

[sj0007]

Chem p4 on 11th .

Can you please help me for Paper 4. I mean how to do Molecular spectrum questions? I have no clue?

 

[sj0007]

that's easy... m worried abt p5 :/

Hey Can you help me with the molecular spectrum questions in A2 Chemistry..please

 

[mehria]

Hey Can you help me with the molecular spectrum questions in A2 Chemistry..please

yea sure...

 

[Bilal Khan]

Can some one help me with this PLZZZZZZZZZZZZZZZZZZZZZ!!!!!!!!
It is from May June 2010 Paper 42 Question 3(d)

The highest mass number is its molecular mass , that is 396 .
So try different possibilites to make 396 like 4 Si , 4 O and 9 Cl .

 

[princess Anu]

where can I find may june 07 chem?? please help
a link to the website maybe

 

[sj0007]

yea sure...

Thank you!!
Can you like brief a method we should approach or the FAQS??

 

[sj0007]

The highest mass number is its molecular mass , that is 396 .
So try different possibilites to make 396 like 4 Si , 4 O and 9 Cl .

So there is n other way just trial and error. Wouldn't it take alot of time??
I also did it the same way. But thought maybe I am wrong...look slike i was correct.