GCSE Chemistry Revision "Required Practical 3: Electrolysis"
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In this video, we look at the required practical on electrolysis.
This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Chemistry. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
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I always say I'll revise tomorrow. "Tomorrow" has finally come and tomorrow is my exam. Great
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mood
Same
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Won’t need this electrolysis rubbish anymore, just done my chemistry exam, thanks for the help.
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I’ve got my exam on Thursday morning this has helped me learn and did my biology today this channel helped me learn the practicals mentioned and made the test a lot easier thanks freesciencelessons
how did it go
@@max-gg9qkthey never answer
anybody got it on thursday like me?
Yep tomorrow
unfortunately :(
yeman chemistry tomorrow
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Last minute revision?
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Told myself to do revision last week, but no.
Told myself to do revision yesterday, but no.
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Chemistry today, good luck.
how’d it go
exams in 30 minutes and i still dont know electrolysis this is the end
Wait I'm curious what did u get
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Thank you so much sirr my GCSEs start in less than a month hope I do welllll if i remember i'll put my results on thiss comment EDIT: i got an 8 in all my sciences really happyyy
Good luck!! Mine are next year!
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sir are we required to know the colours of gases given off since they ask what is observed many times?
no
@@lulualkardi7431 bit of a late reply haha
I watch this guy instead of reading from my textbook
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Thanks so much for your great videos I just wanted to ask if you’ve covered all topics for paper 1 thanks so much
3:38 we're breaking down sodium chloride to produce pure sodium and pure chlorine, so where's the pure sodium? You stated that the experiment produces only hydrogen and chlorine, unless sodium isnt supposed to be produced?
You produce sodium and chlorine when you electrolyse molten sodium chloride not a solution of sodium chloride.
@@Freesciencelessons you are the best teacher, replying to comments that are so recent. Love you ❣️
Watching this night before my exam
Kindly also do a video on electrolysis calculations realm y appreciate your videos
Could u do a video on calculations for change in momentum when both objects in an event are mobile like two cars speeding at each other then colliding rather than a stationary car getting hit by a moving car?
Tac Chy is that even a GCSE topic?
i think you're talking about physics paper 2 motion and forces as in newtons laws
yeah im pretty sure it's in the spec higher momentum (4.5.7) he's done a video on calculations for velocity or mass when a moving object interacts with a stationary object like a cannon recoiling, but I find the calculations more difficult when there are two moving objects, so I was hoping that he could do a video on that.
Hi sir, we are not going to be asked about the tests for e.g chlorine in the electrolysis unit as I know that has been removed from paper 2 higher :)
I've left it to the morning of the exam?!
Bros got 8 minutes till the exam
PLEASE GIVE US A BLOOPERS VIDEO
Good Luck for tomorrow everyone! We will smash this test!!!
Is this paper 1 or 2??
This is paper 1.
your name made think about the biology paper, which caused me to cry, thanks
Freesciencelessons
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goat , got the gcse tmmrw, lets see what i get
Even though the syllabus has changed, do these videos still apply for the upcoming exams?
Any video with 9-1 in the title is for the new spec.
Why is the metal (less reactive) discharged at the cathode. I thought the more reactive one would be attracted to the cathode filled with electrons because they can easily gain the electron to form an atom.
More reactive metals lose electrons more easily than less reactive metals. That also means that more reactive metals GAIN electrons LESS easily than less reactive metals. So more reactive metals are less likely to gain an electron and be discharged at the cathode.
After biology yesterday I’m shitting it!
do we have to know how much, eg 50cm*3 of solution for each practical ??
thank you so much for every single video - they're the best
yeah so i think 250cm cubed for olution is good
Thanks for the comment. No you're not expected to know actual volumes of solutions so don't get bogged down by those.
alice !! Just make it up in the exam to seem like you know it
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Thanl You sooo much Sir. God bless you
Hey, what's going to be on the insert for this exam? Will we be given the reactivity series and the common ions or will we need to learn them off by heart? Thanks!
You will be given a periodic table and that's it. You need to learn the charges on group 1 (+1) and group 7 (-1) and that group 1 are highly reactive. You will be given any other information that you need.
Oh okay that's great! Thank you for the quick reply.
Do we need to memorise the reactivity series? My teacher has been telling us we should know it by heart but I heard you say in one of the videos that you don't need to memorise it. If you could clarify on that that would be great, thank you.
Exam tomorrow wish me luck 🍀 🍀 🍀 🍀
Are we required to remember both of the copper chloride and sodium chloride practical?
Yes for AQA you need to know them both as they give different products.
for the half equations; in the exam will we be given the ions or the amount of electrons and told to complete the equation? or do we have to memorise the equation
omds finally end of playlisr ;)
I HAVE CHEMISTRY PAPER 1 AND GEOGRAPHY TOMORROW HELP
Saved me for the 6 marker
how do we know when a gas is produced at either the anode or the cathode?
what will be the product at negative electrode in electrolysis of lead bromide
Sir, please help. My exam is very close, and so is everyone else's. If hydrogen is produced at the cathode when there are more reactive metal ions, why is aluminium and other more reactive ions extracted using electrolysis. They wouldn't form...
Those compounds are melted not dissolved in water.
Can you please tell me the difference then in what would be discharged at the electrodes?
Oh I'm sorry, never mind. I understand now that solutions could give off hydrogen and hydroxide ions because of the water in the solutions, but that doesn't apply to molten compounds
EXAM TOMMOROW !!!!!!!11
finally im the person saying their exam is tomorrow
time to start revising for paper 1
Thank you so much !
good luck everyone
Thank you!
literally the only reason why ima pass my mocks is him
would they tell you in the question whether the metal is more or less reactive than hydrogen?
If it is an aqueous solution, will it definitely say "(aq)" in the exam?
yes
and they will tell you In the question
Yes, i think, unless you have to fill it in
Hanji it should say
I understand the rule about electrolysis in aqueous solutions, but WHY does it revolve around the reactivity of the ions involved?
mock in one hour
What did you get
Exams tomo and here’s me doing this the night before
Why do you need a lid
2 hours 5 minutes until the gcse
Do you need to do the sodium chloride solution in the exam for electrolysis practical?
Here for my mocks LOL
1 hour 25 minutes till exam
THANK YOU
hey sir, when i look at other people making videos about this electrolysis practical, they actually do not use a petri dish and instead directly use two electrodes connected by some kind of box. If i wrote your method in the exam, iit would still get me full marks right?
The Petri dish is just a way to hold the electrodes without them touching and that's what is suggested by AQA on page 81 of their required practical support book filestore.aqa.org.uk/resources/science/AQA-8464-8465-PRACTICALS-HB.PDF
These electrodes are then connected to the power supply. So if you describe what I say in the video then that's fine.
So what happens to the sodium and hydroxide? Are they oxidised and reduced or do they attract and form a compound in the middle?
They are neither oxidised nor reduced. They form sodium hydroxide which is left over.
@@Freesciencelessons Ok, thank you
Thank u so much, everything is going shit
When you say that the damp blue litmus paper becomes 'bleached' when it comes into contact with the chlorine what do you mean by that?
Bleached means that it loses all of its colour and goes white.
Gr8t video plz clear my confusion wouldnt this be the case if it was molten, since its aqueous why arent you considering OH- ion being discharged due to the ease of discharge producing oxygen at anode rather than halogen wich form a solution plz clear this very perplexed
Hi and thanks for the comment. Remember that we are electrolysing concentrated sodium chloride solution (with a very large concentration of chloride ions) so the halogen will be more likely to be produced at the anode than oxygen.
Do you have to remember the steps ?
How would we test for oxygen at the anode?
We collect the gas in a test tube. We then insert a glowing splint into the mouth of the tube. If the glowing splint relights, then the gas is oxygen.
So many rules to remember
Paper 1 tomorrow… good luck everybody
What is the hypothesis?