GCSE Chemistry AQA - Paper 1 *PREDICTIONS* (May 2024)
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- เผยแพร่เมื่อ 24 เม.ย. 2024
- In this video, we will go through 3 predictions based on research of all the past papers for AQA GCSE Chemistry Paper 1...
Free 1-1 Lesson: app.am-digital.uk/tuition-1133
Aluminium is used to explain why aluminium oxide (bauxite) cannot be separated to form product of aluminium through carbon reduction as aluminium is more reactive than carbon. Therefore alumium oxide should be separated through molten electrolysis by adding cryolite into the solution to decrease melting point making the system overall more energy efficient and cheaper as you would no longer require as high of a melting point to turn them molten in order to extract the aluminium metal.
epic!
thanks
@@Jay-lz4gu Your welcome
im cooked
cheers bro
Can you please do a video on the chemistry hard quantitative questions in chemistry because it’s always the math questions that put me down
MY ANSWERS TO QUESTIONS HE DID
1) Reduction can't be done with carbon for aluminium as it's more reactive than carbon
2) Cryolite's added to aluminium oxide to lower the melting point from ~2000 degrees C to 900 degrees C, saving energy, money, and resources
3) Electrolysis doesn't have a 100% yield as:
* some products are in gaseous form (eg hydrogen) so it can escape the reaction.
* some aluminium may be lost during separating the mixture
* there may be side reactions occuring so different products are being formed that we dno't want/need
4) OH BOY HERE WE GO COMPARING DIAMOND AND GRAPHITE
* Diamond forms 4 strong covalent bonds, graphite only forms 3, both to other carbon atoms.
-> therefore diamond is a giant covalent structure and graphite is a giant covalent lattice
-> this means diamond is an incredibly strong and hard material, used in things like cutting tools and jewelry. Graphite's layers of lattice structure is held by weak intermolecular forces, which makes it soft and easy to remove layers, so it's used in things like pencils. Because of graphite's layers and the fact it only forms 3 covalent bonds means that graphite has a sea of delocalised electrons, meaning it can move freely through the structure and conduct electricity. (ADDED IN WHILE WATCHING HIS ANSWER: However, diamond can't conduct electricity as it has no delocalised electrons. Diamond has a very high melting point as it requires a LOT of energy to overcome the incredibly strong covalent bonds, whereas graphite's melintg point isn't as high, due to the weak intermolecular forces between layers don't take much energy to overcome.)
5) TITRATION METHOD
* i wrote it on a flash card and cba to copy it out rn, got the exam in less than two hours now woo
thanks sir!
aluminium is above carbon in the reactivity series
Please could you do Edexcel biology, chemistry Triple Higher
is this for combined science: trilogy too?
ngl i would say his predictions were pretty accurate
please do one for aqa combined trilogy!!!
this is still has the specification for combined trilogy
Hello! Can you pls clarify, in the last titration question, shouldn’t it be the other way around ie. Acid in the burette, and alkali in the flask?
It can be either way around
@@Puzzled_Penguin ok thx!
It doesn’t really matters but usually (always in exams) it’s the alkali in burette and acid in the conical flask. You just put which ever (acid or alkali) that has a known concentration then into the burette.
It is usually alkaline in flasks and acids in burettes. Alkaline when put in burettes can slowly react with the glass/plastic of the burette creating a blockage within the burette. Therefore in atleast AQA exams it would usually be alkali in flask, acid in burette. However like @moon4 had said burette is for unknown concentration which is to be found out after carrying out titration, a pipette is used to measure the solution in the flask for known volumes.
can you do one on paper2?
could you please do one for physics
he has
Sr can u do a video on some past papers for combined science higher coz I feel like I really understand your videos and I've been watching u since a few months now and ur the only one who bought me to a 77 . so can u pls do a past paper question video where u go through the exact mark scheme too!
thanks
Hi, thanks for your comment and glad to hear you are finding the videos useful! We will aim to do a combined science video also, so stay tuned!😊
is this for combined or triple ?
Triple. Titrations don’t come up in combined.
what required practicals do you think is going to come up
The titration six marker that he gave an example of could be the main required practical question
No questions at all Electrolysis, Metal extractions(carbon reduction) possibly Soluble and insoluble salts
@@moon4. the soluble salts practical was a 6 marker on the 2023 aqa higher exam !
Is it because aluminium is what the electrodes are made of?
Carbon not aluminum bruh
@@danycash9323 so whats the answer?
@@danycash9323 im not tryna be a wind up chemistry is not my strongest subjecet
@@john.smith12 I think its because if aluminium is more reactive than carbon then carbon cannot displace it in a redox reaction so it has to be extracted through electrolysis.
@@maryp5091yes
why is it aluminium?
cos it is more reactive than copper
I thought graphite has high melting point???
technically not because it has weak intermolecular forces imbetween layers which allows them to slide over eachother. but graphene has a high mp cos it has covalent bonds with no intermolecular bonds
Also at 3:50 he doesn't say it has weak forces, he says it has *weaker* forces
@@Curry_Muncher69420 oh so “high melting point” is only suitable for graphene?
@@MarcusLau0104 no, they both have a high mp (graphene is stronger but you shouldn't need to know that). but when comparing with diamond like the question you need to say that graphite has a low*er* mp than diamond. Diamond has the highest
Hope this helps. Good luck tomorrow!!
@@Curry_Muncher69420 thanks man
combined sci pls