How was 9702_w15_qp_34?

[paperneeder100]

salimali: In 9702_w15_qp_34, we had two experiments. One was finding out the extension of a spring. That spring was attached to a string on which a weight was added. Along with the extension, we also had to measure the angle of the string being made by the weight. I attached a picture of the experiment. (Please forgive the awesome art. I drew it using my laptop's touchpad). The second experiment was an electronics experiment where we had to find the volume of two capacitors(?) and calculate the time taken for an LED light to completely turn off after being in a closed circuit. We had to repeat the experiment and find the percentage uncertainty from the time calculated. That's all I can remember.

 

[DarkEclipse]

1 and 3 are same.
I wrote others
- Mesurment of diameter with scale may produce an parallex error. SO use digital vernier callipers.
- Difficult the start the time when we open the switch. Use video with time frame.
:/ I guess I will lose 4 marks

What was ur percentage uncertainity?

Why? Callipers is a good one. Not the video one though.

Don't remember, it was in the 2-9 range.

 

[DarkEclipse]

Yes positive intercept and gradient.

Usually 1 mark for trend. Do not worry. Entire thing is out of 30 anyway.

Really do not know I didn't give practical that much time and effort

That's good

 

[The Sarcastic Retard]

Why? Callipers is a good one. Not the video one though.

Don't remember, it was in the 2-9 range.

Ahan.

 

[DarkEclipse]

Ahan.

You're confusin' me bro

 

[Muhammad Saad :)]

Anyone giving Chemistry practical variant 34 on 20th?

 

[The Sarcastic Retard]

Anyone giving Chemistry practical variant 34 on 20th?

Me.

 

[darks]

awesomaholic101
darks
DarkEclipse

not giving physics got an A already in AS

 

[Muhammad Saad :)]

Me.

Any guesses or information what is expected?

 

[The Sarcastic Retard]

Any guesses or information what is expected?

Same brother.
Titration.
Enthalpy
Qualitative Analysis.

First two are easy for me, this detection thingy is outta ma head.. Loads of mistakes.

 

[Muhammad Saad :)]

I heard that a reaction of rate is coming(sir at college predicted it)
See October 2012 variant 34.
I practised that paper, it is very very long and l could not manage time.

 

[The Sarcastic Retard]

I heard that a reaction of rate is coming(sir at college predicted it)
See October 2012 variant 34.
I practised that paper, it is very very long and l could not manage time.

All Chemistry papers 34 are lengthy.

 

[paperneeder100]

The May/June 2015 paper had some enthalpy in it, the specific heat capacity question to be more precise, so I would suggest studying that.

 

[The Sarcastic Retard]

The May/June 2015 paper had some enthalpy in it, the specific heat capacity question to be more precise, so I would suggest studying that.

Thanks.

 

[paperneeder100]

No problem.

 

[The Sarcastic Retard]

No problem.

Am Indian As well..
Well, any tips for qualitative analysis?

 

[paperneeder100]

I was typing it before you sent that. For titrations, you can refer to this video (www.youtube.com/watch?v=sFpFCPTDv2w). It's quite good.

 

[paperneeder100]

That video also has a link on how to solve titration sums (I don't think we need them), but for the sake of completeness, you could go through it.
As for qualitative analysis, I would suggest that you study the qualitative assessment charts given at the back of our practical papers even though they are given. It would help since questions related to it can come in the Multiple-Choice components.

 

[The Sarcastic Retard]

I was typing it before you sent that. For titrations, you can refer to this video (www.youtube.com/watch?v=sFpFCPTDv2w). It's quite good.

Thank you <3

 

[paperneeder100]

As I said, no problem. I mean, this is the objective of this forum.