Thank you so much! Studying via distance learning, and as a mature student, this is the part of the exams I was most concerned about. Hopefully I will be fine now :)
Great video amazingly helpful but do we need to know the equation for sodium thiosulfate + hydrochloric acid. Isnt Sodium thiosulfate Na2S2O3 rather than Na2S2O8. Should also have the addition product of water Na2S2O3 + 2HCl → 2NaCl + SO2 + S + H2O
Tibhesh lc hi there, I have a revision website for with loads of resources for the a-level exam (yr 2 mainly). Check it out here at drclays-alevelchemistry.com/
Thank you very much! I'm studying away from school and this is my only source of learning practicals do you have any idea of what I should revise on for paper 2 regarding practicals, sources etc.
Another dank video, but I was a bit confused at practical 3. During the reactions being measured would there be any way to deal with the solutions losing heat to the environment? Would temperature change due to the reaction being endo/exothermic come into play?
Hi Shon, when measuring the enthalpy of combustion in a classroom this practical is often undertaken with a fuel burner underneath a tin can to heat some water. In this experiment, heat loss would occur to the environment and a bomb calorimeter would help enormously. Furthermore, you would get inconsistent results with database values if you were trying to measure the enthalpy of combustion and observing the formation of soot as this would indicate incomplete combustion. Again bomb calorimetry would help here as you would ensure a good flow of oxygen. Do check out my new webiste drclays-alevelchemistry,com where I will be starting live revision webinars from monday all the way up to the exams. Thanks Doc Clay
Daniel Henry hi Daniel, I expect it to be sufficient detail for experiments 1-6, however you will need experimental activities 7-12 which is in the new videos and practical skills playlist.
Is this all the detail we need? If i was to memorise and write out these methods word for word, if it was asked in the exam, would I obtain all marks?? :)
@10:40 I've read online sodium thiosulfate is Na2S2O3.5H20, when you say sodium thiosulfate is Na2S2O8, are you taking into account the oxygens from the water?
Sodium Thiosulfate is a primary standard and its assume to be free of water of crystallization. So you do not need to consider the five molecules of water when calculating its molar mass.
hi grace, thanks for the question. the unknown volume will either be the amount you pipette into the conical flask (often 25cm3) or the volume required to reach neutralisation (the titre volume) read from the burette (again in cm3). hope that helps. doc clay
Hi There, this is for rates of reaction in the AS level course. You need to know this for the exam but it is not the iodine clock reaction, which is described here ua-cam.com/video/_t_ZC966TmE/v-deo.html . Also check out my revision site at drclays-chemistry.com . Thanks for watching. Doc Clay
+Chris Clay thank you your videos are great for the a level paper three if u do everything in your video will I be okay because your video doesn't go into as much depth as the aqa handbook so I'm abit worried I don't know enough
Bang it reduces the chance of spillage of the sample as the neck of the flask is narrow. do check out my website at drclays-alevelchemistry.com/ especially if you are using the a level this year
will do,thanks for taking the time out to make these vids, have you got any tips on how to revise/answer the practical questions, also do you have any predictions for the higher mark questions e.g. 6 markers etc...
+Andy Cole hi Andy, having seen the paper1 I'm not too sure. the best revision Q's I've come across are from the cup AQA as yr 1 book. the questions showed a similar style and ability level. as for paper 2, it is on organic chemistry and the relevant physical chemistry. do you know the topics that will be in the paper? I imagine there will be practical questions related to rates reaction and distillation versus reflux along with testing for aldehydes and ketones maybe alkenes. but it's hard to predict. best of luck doc clay
1 - Volumetric solution/acid-base titration - 0:25
2 - Measurement of an enthalpy change - 5:51
3 - Rate of reaction - 9:05
4 - Test tube reactions - 12:50
5 - Distillation - 14:28
6 - Organic tests - 16:46
Anushka thank you for identifying the practicals. Do check out my revision site too at drclays-alevelchemistry.com
pleased to hear it is helpful Faiza
Thank you so much! Studying via distance learning, and as a mature student, this is the part of the exams I was most concerned about. Hopefully I will be fine now :)
Good news Becca and best of luck
I guess I'm pretty randomly asking but do anyone know a good site to stream new movies online?
@Harper Ira Flixportal :D
@Stanley Kyree thanks, signed up and it seems like a nice service :) Appreciate it !!
@Harper Ira Happy to help :)
you're a legend
good luck for the exam, hope the videos help. please like and share the videos
Great video amazingly helpful but do we need to know the equation for sodium thiosulfate + hydrochloric acid. Isnt Sodium thiosulfate Na2S2O3 rather than Na2S2O8. Should also have the addition product of water Na2S2O3 + 2HCl → 2NaCl + SO2 + S + H2O
you are just awesome man!!!! please upload further more!!! about tackling the past paper question!!! exama are near
Tibhesh lc hi there, I have a revision website for with loads of resources for the a-level exam (yr 2 mainly). Check it out here at drclays-alevelchemistry.com/
Thank you very much, this is very helpful and informative! I look forward to your future videos :)
+secretninja396 Great news, do share the video and like. THhanks
there is another one to come on practical skills soon
+hachibi712 hi hachibib, this is only linked to the AQA specification. Try knockhardy publishing (Google search) for Ocr help.
good luck
THANK YOU SO MUCH FOR THESE VIDEOS! Sums all the practicals up very well :)
thank you polar bear, best of luck for exams
Thank you very much! I'm studying away from school and this is my only source of learning practicals do you have any idea of what I should revise on for paper 2 regarding practicals, sources etc.
Great video. Much appreciated. This has really helped me a lot. I can't thank you enough.
Hamza, pleased it was helpful. Best of luck for the exam. Please like and share my videos. More to come for next years course.
Thanks so much Sir. I understand better from your videos. Keep uploading! :)
Amazing God bless you sir
Good luck today
great video !!!keep on the good work sir
thanks masib. please like and share the videos. plenty more on organic chemistry and yr2 chemistry coming soon.
best of luck for the exams
doc clay
Perfect, just what I needed. Thank you!
thanks nino. please like and share my videos
doc Clay
+Chris Clay sorry, I spelt your name wrong Nina.
+Chris Clay no problem - will do! :)
Thank you for this video! Really helpful!
Another dank video, but I was a bit confused at practical 3. During the reactions being measured would there be any way to deal with the solutions losing heat to the environment? Would temperature change due to the reaction being endo/exothermic come into play?
Hi Shon, when measuring the enthalpy of combustion in a classroom this practical is often undertaken with a fuel burner underneath a tin can to heat some water. In this experiment, heat loss would occur to the environment and a bomb calorimeter would help enormously. Furthermore, you would get inconsistent results with database values if you were trying to measure the enthalpy of combustion and observing the formation of soot as this would indicate incomplete combustion. Again bomb calorimetry would help here as you would ensure a good flow of oxygen.
Do check out my new webiste drclays-alevelchemistry,com where I will be starting live revision webinars from monday all the way up to the exams.
Thanks
Doc Clay
Do check out my new webiste drclays-alevelchemistry,com where I will be starting live revision webinars from monday all the way up to the exams.
OK, thank-you.
Thanks for the great content. Is there anything like this for the A2 practicals?
Milo Burich I'll be writing that video soon, don't worry. please like and share the videos in the meantime
This was so helpful! Keep uploading videos :)
+Holly Jayne pleased you like. Do share the video and like. Thanks
Hi, do you suspect this will be sufficient detail for questions on practical techniques in the AQA new spec paper 3 a level? Thanks
Daniel Henry hi Daniel, I expect it to be sufficient detail for experiments 1-6, however you will need experimental activities 7-12 which is in the new videos and practical skills playlist.
very helpful wish I found your channel earlier, exam is tomorrow :(
best of luck amir. I have plenty of videos on paper 2.
hahaha why everyone just before the day of exam lol
Is this all the detail we need? If i was to memorise and write out these methods word for word, if it was asked in the exam, would I obtain all marks?? :)
Harriet Jones not really. you need to understand the steps because in long answer questions they ask for equations at each stage.
@10:40 I've read online sodium thiosulfate is Na2S2O3.5H20, when you say sodium thiosulfate is Na2S2O8, are you taking into account the oxygens from the water?
Michael Chiklis hi Michael, they are the same. .5H2O would be irrelevant when dissolved in solution
Sodium Thiosulfate is a primary standard and its assume to be free of water of crystallization. So you do not need to consider the five molecules of water when calculating its molar mass.
Helloooooo to you too
how do we know the volume of the unknown solution in the first step of the titration?
hi grace, thanks for the question. the unknown volume will either be the amount you pipette into the conical flask (often 25cm3) or the volume required to reach neutralisation (the titre volume) read from the burette (again in cm3). hope that helps.
doc clay
+Chris Clay thanks makes sense now :)
Hi for practical 3 why is HCl used instead of HI because I thought for the AQA spec we need to know the idodine clock reaction
Hi There, this is for rates of reaction in the AS level course. You need to know this for the exam but it is not the iodine clock reaction, which is described here ua-cam.com/video/_t_ZC966TmE/v-deo.html . Also check out my revision site at drclays-chemistry.com .
Thanks for watching.
Doc Clay
+Chris Clay thank you your videos are great for the a level paper three if u do everything in your video will I be okay because your video doesn't go into as much depth as the aqa handbook so I'm abit worried I don't know enough
how did Paper 3 go last year??
Why do you have to dissolve the solid in the beaker before transfering it into the volumetric flask?
Bang it reduces the chance of spillage of the sample as the neck of the flask is narrow. do check out my website at drclays-alevelchemistry.com/ especially if you are using the a level this year
Thank you!
topman, large up chris!
thanks Andy, do share and like the video if it is useful and best of luck for the exams
will do,thanks for taking the time out to make these vids, have you got any tips on how to revise/answer the practical questions, also do you have any predictions for the higher mark questions e.g. 6 markers etc...
+Andy Cole hi Andy, having seen the paper1 I'm not too sure. the best revision Q's I've come across are from the cup AQA as yr 1 book. the questions showed a similar style and ability level.
as for paper 2, it is on organic chemistry and the relevant physical chemistry. do you know the topics that will be in the paper?
I imagine there will be practical questions related to rates reaction and distillation versus reflux along with testing for aldehydes and ketones maybe alkenes. but it's hard to predict.
best of luck
doc clay
thanks for that, is it possible if u can through the specimen set 2 papers that would be so helpful. thanks in advance.
+Andy Cole hi Andy do you mean the specimen paper 2 or practical skills for paper 2?
Anyone else here cos they're completely fucked for tomorrow?
Gan Radge Neck Cowies best of luck for the exams. heaps more resources on my revision site drclays-alevelchemistry.com
whos here because of paper 3 tomo