Need help with Chem CIE Paper 3! How to calculate if two exp. results are consistent?

[iSean97]

Need help with Chem CIE Paper 3! How to calculate if two exp. results are consistent?

c(ii)

 

[iSean97]

sorry for late upload of question
I uploaded it via attachments, but it seems that my files didn't pop out.

 

[iSean97]

 

[iSean97]

help?

 

[ruby_fern]

help?

hey there! i remember our teacher telling us to cross multiply and see if the answer you get for that corresponds to the value obtained from the experiment. Your answer for this question totally depends on your experiment and whether you've done that correctly. I think its kind of like a self evaluation thing that you get marks for as long as you are able to justify your answer.

 

[ruby_fern]

ur handwriting is really nice btw

 

[ruby_fern]

NotYourType check this qs out. this is the only one ive seen like this i think

 

[iSean97]

hey there! i remember our teacher telling us to cross multiply and see if the answer you get for that corresponds to the value obtained from the experiment. Your answer for this question totally depends on your experiment and whether you've done that correctly. I think its kind of like a self evaluation thing that you get marks for as long as you are able to justify your answer.

Erm how you mean cross multiply?

Thanks for the compliment. I normally wont write so tidy tho

 

[ruby_fern]

Erm how you mean cross multiply?

Thanks for the compliment. I normally wont write so tidy tho

When you use 2.27g for FA5 then you lose 0.35g of water; then when you use 1.85g, you would expect (1.85 x 0.35) / 2.27 = 0.285g of mass loss. this value is consistent with what you have got from experiment - 0.29g. So the results from your experiments are consistent with each other. you would score a mark for the calculation and another for your conclusion.