These top tips actually came clutch for my mocks last year and so I highly highly recommend everyone to watch this video because it’s a lifesaver Thank you James 🎉❤
These videos are great thank you a lot. I just have a question. what could they ask in an exam in the 1-3 marks questions on these topics. e.g. why is an excess of KI added? for redox and electrode
my brother in christ. from this day on I will be binging your content thoroughly in preparation! also how do you make your predictions and how much should i try and focus on what you listed
Thank you. I look at the frequency of topics from past papers and predict from that using the logic, the less a topic has been tested, the more likely it is to come up. Like I say in the video, don't just rely on my predictions as I don't know for sure what will be on. I have, however been pretty accurate to date. Hope that helps
Helpful video, thank you. Quick Q: In periodicity, how do you know whether to talk about shielding effect, atomic radius, nuclear attraction etc or to talk about charges of ions, more electrons, and greater attraction between ions and electrons?? Thank you!
Hiya thank you so much for this video! I was wondering though- do more elctrons in molecules result in stronger london forces formed or more london forces formed between molecules?
thank you so much for this video, i just wanted to ask 2 questions. How do we know when to flip the e cell that is less positive or flip the reducing agent? And the other one is how do u determine whether the question is talking about an acid buffer or an alkali buffer?
An acid buffer will contain a weak acid like CH3COOH and the salt of that weak acid (CH3COONa) whereas an alkali buffer will contain a weak acid in excess and a strong alkali like NaOH which will react together to form a salt and water (this is a partial neutralisation reaction)
Hello, so I was just wondering since we will be given the equations for the redox titrations does that mean we dont need to memorise the ratios e.g. Fe: MnO42- ratio because my teacher said we had to? Thank you :)
In every redox titration question I’ve ever seen (and I’ve seen a lot!) the equation/half equations have always been given. If you can’t remember the equations you can’t do the question. The Fe:MnO4- and I2:S2O32- systems are specifically mentioned on the specification so it wouldn’t hurt you to remember those two 5:2 and 1:2 but the equations will be there. Have you seen my redox titrations walkthrough playlist? There are 10 different exam questions covered.
Small Q. In the buffer Qs, when do you square root (I believe that's the term) the [H+] and Ka times together? Sometimes you need to for the correct answer and sometimes you don't and I can't tell when I need to or not, thanks.
I remember it as if the change in temp. is positive in the info given , will be exothermic so negative sign as reaction has released energy to surroundings
@@Aeyohh Last minute revision moment, but in all seriousness dont stress at all, use the energy to instead revise right now and to focus on the exam tomorrow
we need to see you get your knighthood this month James your a legend 👊🏻
I think these videos are great for common misconceptions and just summarising everything in general
I can’t thank you enough James for this video Tysm🐐
These top tips actually came clutch for my mocks last year and so I highly highly recommend everyone to watch this video because it’s a lifesaver Thank you James 🎉❤
Why you still here then big man
@@r.r4358 I had mocks last year g just like you man
What exam board do you do?
thank you
Thank you!
You're welcome!
Thank you ❤️
These videos are great thank you a lot.
I just have a question. what could they ask in an exam in the 1-3 marks questions on these topics. e.g. why is an excess of KI added? for redox and electrode
Can you please do one for IAL edexcel ?
Very useful, thanks! 👍
Don’t I know you?
@@MaChemGuy 🤔 maybe from somewhere... 😂
lets do thissss
ur a godsend
my brother in christ. from this day on I will be binging your content thoroughly in preparation! also how do you make your predictions and how much should i try and focus on what you listed
Thank you. I look at the frequency of topics from past papers and predict from that using the logic, the less a topic has been tested, the more likely it is to come up. Like I say in the video, don't just rely on my predictions as I don't know for sure what will be on. I have, however been pretty accurate to date. Hope that helps
also what are the factors that affect delta S system and surroundings
Helpful video, thank you. Quick Q: In periodicity, how do you know whether to talk about shielding effect, atomic radius, nuclear attraction etc or to talk about charges of ions, more electrons, and greater attraction between ions and electrons?? Thank you!
for ionisation energy you always talk about shielding, atomic radius, nuclear attraction I'm pretty sure
🎉
Hiya thank you so much for this video! I was wondering though- do more elctrons in molecules result in stronger london forces formed or more london forces formed between molecules?
Stronger as the induced dipoles created with a greater number of electrons are larger
thank you so much for this video, i just wanted to ask 2 questions. How do we know when to flip the e cell that is less positive or flip the reducing agent? And the other one is how do u determine whether the question is talking about an acid buffer or an alkali buffer?
An acid buffer will contain a weak acid like CH3COOH and the salt of that weak acid (CH3COONa) whereas an alkali buffer will contain a weak acid in excess and a strong alkali like NaOH which will react together to form a salt and water (this is a partial neutralisation reaction)
@@hafsaakhtar2563 ahh okay that makes sense, thank you very much
i know how a heterogenous catalyst works but for homogenous catalyst how does it work?
Does these for work extended too?
hi please could you do a level chemistry aqa paper predictions?
How do you know those are the predicted are they the topics that haven’t been tested as much recently? Solid video btw👌
All explained in my predictions video
Hello, so I was just wondering since we will be given the equations for the redox titrations does that mean we dont need to memorise the ratios e.g. Fe: MnO42- ratio because my teacher said we had to? Thank you :)
In every redox titration question I’ve ever seen (and I’ve seen a lot!) the equation/half equations have always been given. If you can’t remember the equations you can’t do the question. The Fe:MnO4- and I2:S2O32- systems are specifically mentioned on the specification so it wouldn’t hurt you to remember those two 5:2 and 1:2 but the equations will be there. Have you seen my redox titrations walkthrough playlist? There are 10 different exam questions covered.
@@MaChemGuy No I haven’t but I will definitely check it out. Much thanks!!
Small Q. In the buffer Qs, when do you square root (I believe that's the term) the [H+] and Ka times together? Sometimes you need to for the correct answer and sometimes you don't and I can't tell when I need to or not, thanks.
I think you’re thinking of calculating the [H+] of a weak acid. That’s the square root of Ka x [HA]
@@MaChemGuy so you only use the square root for weak acids?
@@erikab6760 Yup
@@MaChemGuy cool thank you!
would the calculation of h+ from a strong dibasic alkali be any different?
No, just the [OH-] will be double that of the alkali
What exam board is this for?
in rate determining step mechanisms are u not allowed to use electrons?
No u don’t :)
at 10:43, I thought that ΔH is calculated from -q/mol as opposed to q/mol. Did I make a mistake somewhere? Thanks in advance.
I put the sign on at the end. Negative if exo, positive if endo. Just the way I do them
I remember it as if the change in temp. is positive in the info given , will be exothermic so negative sign as reaction has released energy to surroundings
quick question, how would you calculate A from an Arrhenius graph if the x axis doesn't start at zero?
Calculate gradient, pick a set of coordinates and put into the equation. Solve for A
Very helpful thanks, will there be another one or is there already one for paper 2? Thanks
I’ll be doing one for paper 2 asap.
@@MaChemGuy ❤
@@layla0907 that’s the derivative of 2,4-DNP
@@MaChemGuy Much appreciated 🙌
will you do one for paper 3 or is that too difficult to predict 🙏
Anyone get like 12.something for the ph of strontium hydroxide
6am gang?
😂😂
Hi sir, quick question. How do you know if a molecule has induced dipole or permanent dipole? Thanks sir :)
All molecules have induced, polar molecules also have permanent
@@MaChemGuy how do u know if something is polar?
If it is unsymmetrical or has lone pairs
@@MaChemGuy ahhh okay thank u so much!
@@J.246he did a video on this it’s so good I’ll try find it for you
I love you
Steady on!
@@MaChemGuy 🎉
@@MaChemGuy😅😊
i thought DeltaHsol was hydration PLUS lattice energy ?
Nope
Need to get a minimum C in chem, what do you advise to do in this last stage????
Keep smashing the exam question walkthroughs and know your definitions
what do you mean by 'multiply the delta H values by the number of moles in the equation?'
12:04
Enthalpy changes are per mole so if there are 2 moles in the equation then you need to double etc
@@MaChemGuy okay thanks 👍
does anyone mind explaining 22:38 to me? why is it the same moles?
You can't apply mole ratios across different reaction equations. The I2 formed in step 1 is the I2 involved in the titration
Is this for AQA or just in general ?
I do aqa but this is for ocr but helps us too! 😩
sir, how do I stop overthinking about the exams before they have even been sat?
Bruv u should be worried if ur not overthinking before ur exam, we're all worried, hopefully the paper will be easy
Are the predictions for just OCR PAPER 1 I’m doing edexcel a level chemistry
I teach OCR so make predictions for that course
@@MaChemGuy do u think it would still be useful for me or nah ?
@@amalmohamud1832 absolutely!
@@MaChemGuy 💯
For 20:28 is it supposed to be cobalt instead of chromium
No
If you don't mind me asking, how accurate have your predictions been in the past for the papers? Just asking out of curiosity, thanks!!
Pretty good tbh
super good my cousin recommended me this guy after her a levels he’s literally a godsend
🤍
AQA?
James only teaches OCR A not aqa however ik ppl that do aqa that said that his videos are the best and use them regardless so do use them
james ily
Steady on!
@@MaChemGuy do you have any predictions for which transition metal colours they’ll ask for tomorrow ?
@@eleanorchem Sorry but I’m not that good! You’ll remember them all, I’m sure
@@MaChemGuy transition metals is alr generally but I hateeee redox/electrode potentials
please tell if this is for AS level Chemistry 9701 too?
A level
@@MaChemGuy I'm giving my AS level p1 will this be helpful for me??
Please tell me this works for AS level chemistry cie
Yes
@@MaChemGuy real helpful thanks
Here at 2 days to go
1 day now
@@mtyre05 im having a panic attack
@@Aeyohh Last minute revision moment, but in all seriousness dont stress at all, use the energy to instead revise right now and to focus on the exam tomorrow