GCSE Chemistry Revision "Required Practical 4: Temperature Changes"

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[@amy_rei4277]

*Remember guys*: ENdothermic - ENter (energy is transferred from surroundings to reacting substances) EXothermic - EXit (energy is released by reacting substances into the surroundings) *Also another one is*: Bendo (B for bonds being broken, endo for endothermic) Mexo (M for bonds being made, exo for exothermic)

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NAHH BENDO AND MEXO THAT’S GENIUS IVE BEEN STRUGGLING TO REMEMBER THAT THE WHOLE TIME!!!

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[@abed4193]

i have a full paper 1 chem exam tomorrow, end of year mocks before we enter y11. i watched all his chem videos, and compared to my CGP revision guides, he is precise and concise. i'm really nervous for my exam, and hoping this man has helped. *fingers crossed*

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Did you end up getting a good grade?

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We really need answers

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[@sandyvioletchowdhury]

yo, update ;D?

[@fizztazz]

This is one of the listed practicals for my gcse this year, thank you for making these accessible to everyone :)

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Cheers 👍🏼

[@annabeable-stroud509]

Watch at 1.5x speed to get through everything for tomorrow’s exam :)

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it is quite literally only 5 minutes long

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I want to thank you, you're the reason why I've been getting really high grades for science since the start of year 11 and now I'm doing my 1st chem test tomorrow.

[@aquaticstarr4607]

The end… good luck everyone on the chemistry paper tomorrow!! And massive thank you to you freesciencelessons for helping us all for all these years :’)

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[@CarHorn3]

Chemistry Paper 1 is today, and I've never been good at Chemistry (or science, for that matter), so wish me luck! I wish all GCSE students of 2022 the best of luck, this one's tough! 💖

[@alexstone9099]

You are doing Gods work keep it up

[@undisclosedscientist2142]

Revising this just before my exam, wish me luck lads, I’ll tell you guys what I got

[@anssa6163]

what did u get?

[@mhmm5379]

what did u get

[@AwesomeCreeves]

Good luck all for the exam tomorrow. You'll all do great!

[@codmob9818]

FINISHED THE PLAYLIST AND I JUS DID A PAST PAPER AND I FEEL RLLY GOOD, ALL BC OF U :) I DONT THINK YOU UNDERSTAND HOW MUCH OF A GIFT YOU ARE TO ME

[@LaibaLatif-u8h]

my exams tomorrow😭

[@yoku-tv]

Who's here for 2023 exams

[@eruusky]

Should I revise actual Chemistry or farming?

[@YousefHashim1]

Chem exam in just under 2 hours. This man is saving my life.

[@soyaltomy1019]

can you use sodium carbonate instead if the solution.

[@kez992]

good luck lads lets get these grade 9s in the bag

[@LWYRUP05]

Can’t remember already

[@otherthings02]

imagine actually getting sleep the night before an exam lmao

[@rachel_murphy06]

got chemistry Paper 1 tomorrow and these videos are so helpful THANK YOU!!!!

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[@myb278]

Probably the last freesciencelesson vid i will see for chem paper 1

[@thekidofgaming]

I got sent this at the end of my remote lesson

[@katewilkinson3640]

I don't understand how the solution's temperature increases when it is exothermic, surely it should decrease because energy is being lost? Could someone please explain?

[@Freesciencelessons]

In exothermic reactions, energy is being transferred (you can't lose energy) from the reacting chemicals to the surroundings. In this case, the surroundings is the water molecules that the reacting chemicals are dissolved in (ie the solution). So, the temperature of the solution increases.

[@techyesblade2506]

Ye I was confused also, but as always freesciencelessons comes in clutch

[@katewilkinson3640]

@@Freesciencelessons thank you!!

[@GamerGirll36]

How do we know the thermometer is just measuring the temperature of the water molecules (the surroundings) though? Doesn’t it measure the temperature of the solution which is a mixture of the system ( the acid and base) and the surroundings ( the water)?

[@Freesciencelessons]

In a beaker, the vast majority of the molecules present will be water molecules. The reactants and products only represent a small fraction of the total. So the thermometer reading will reflect the energy of the surroundings (ie the water molecules).

[@adamecho0236]

Great video helps a lot

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This guy is my new religion

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God bless this man

[@pongmehraissangwingsang]

How can we then calculate the bond energy term given the standard enthalpy of atomization ??😢

[@Charles-fi7ww]

Sorry, ik this is late to ask but i've replayed the video but i still dont understand why the temperature actually decreases, the energy released is spread out and greater, meaning there should be a higher temperature surely??

[@Freesciencelessons]

Once you reach a certain point, the energy released by the reaction is the same. However, after this point, this energy is now spread out in a greater volume of solution, so the average energy of the particles is less. This makes the temperature less (temperature is the average energy of the particles).

[@Charles-fi7ww]

Ohh, I forgot the volume was increasing too. I really appreciate your quick response on a Sunday, thanks a lot your videos have really improved my confidence for science in general.

[@NeillyWheelie]

I'm a little lost: in class we did this practical but we did a displacement reaction instead of a neutralisation - does anyone know why/did the same?? Thanks :-)

[@Freesciencelessons]

You're allowed to do any reaction where there is an energy change so a displacement reaction is also fine.

[@shade694]

Sir, will the steps be in the chemistry paper?

[@imbyp0]

I love your videos freesciencelessons

[@chess5779]

would the graph not be a curve??

[@mrqwerty4792]

WE GONA ACE THE EXAM TOMORROW AREN'T WE GUYS?! be confident and you'll pass with flying colours, trust me... lemme know how you did :)

[@najmallayl]

How would you tweak this experiment in order to test the effect of acid concentration or acid volume on sodium hydroxide?

[@jamiegreen2199]

love that tie

[@boazdriskell9980]

quarantine gang anyone?

[@bradheywood9787]

Every video this guy informs me that I can buy a guide in the link above his head. I go onto it and the biology isn't even out yet. When will this be out?

[@boogiepop8063]

All I can say now is good luck to all for tomorrow

[@Angela2e5]

It's midnight and watching this for tmr😭 thank you sm tho

[@rushvi1611]

sir, why would you put the bulb of the thermometer inside, how is it possible to read the temperature and isnt the tip of the thermometer the part able to detect change?

[@theclutchhawk1034]

Rushvi Shah the bulb of the thermometer detects change, you can read the temperature along the sides of the thermometer as the red bar rises up

[@nazanin7787]

Are these the only required practical we need to know for paper1

[@JamesHoyle.]

Soluble salts, titrations, electrolysis and this one, yep

[@mcslammer4989]

+James Hoyle not chromatography?

[@naimaabbas941]

Does it matter if the units are different as these are different from my cgp revision guide

[@273]

Naima Abbas no, he just does them in a different order

[@hasankaya259]

this a long explanation but clear. In the exam Im assuming it will be a 6 marker, where can i find a shorter method all in 6 points

[@Freesciencelessons]

I would suggest simply taking the method that I give and shorten it to a smaller number of bullet points. Don't forget that six markers are marked on a best fit which means that you do not have to say every single thing to get 6 marks. But the answer must be logical (ie read through in a clear sequence).

[@mikedean3106]

@@Freesciencelessons for many practicals do u need to talk about the variables

[@Freesciencelessons]

Yes that's correct but not for every one.

[@juliat1160]

Do we need to know all the chemicals for these practicals or just the process ?

[@alissa-d9m]

GUYSSSSS GOOD LUCK FOR THE CHEMISTRY EXAM TMRV WE WILL ALL DO GREAT!!!

[@eeeeee8829]

good luck everyone

[@Highestintheroom12]

good luck guys

[@oliviarose9676]

so do we need to know the different variables and what they mean?

[@Freesciencelessons]

Yes you should learn them.

[@kohai3444]

GOODLUCK EVERYONE

[@charlie9769]

Bruh its my first time learing this wtf the day before the test

[@mutusingh4727]

Energy released is spread out into a greater volume. What does that mean?

[@furkiking8323]

If you heat small amount of water and large amount of water for same time, small water gets more hotter (has more temperature). Similar thing happens here. So when you add extra NaOH, volume increases and no more energy is released (HCl finished) Hence the energy is spread out making temperature less, E = mcΔt (E and c is constant) so E =mΔt (m is mass and t is temperature), if mass increases , temperature decreases (inverse proportionality). I̶ ̶w̶r̶o̶t̶e̶ ̶t̶h̶e̶ ̶u̶n̶n̶e̶c̶e̶s̶s̶a̶r̶y̶ ̶b̶i̶t̶ ̶f̶o̶r̶ ̶f̶u̶n̶

[@aryanagrawal1782]

Think about energy dissipation: There is more solution when you add more sodium hydroxide, therefore a larger area for the heat energy to spread out across. The energy spreads out evenly across all the solution. After a certain point, adding more sodium hydroxide does not increase the maximum heat energy (temperature) More solution means more particles, so each particle gets less energy.

[@Kingthere]

great video!!!!!!

[@asifmahmoud126]

Sir when will you do water purification practical?

[@mohammednabil5254]

hes done it

[@leavethecity8984]

will it be these chemicals that will come up in the exam or could they give us any exothermic reaction, thanks

[@mitchaxon2045]

Exam boards would give you the chemicals required for the experiment in the opening lines of the question

[@NikitaShah123]

good luck today!

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2 words- life saver

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Goodluck guys for tomorrow's chem paper 💪💪💪

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Im not gonna lie but this is amazing

[@finhart769]

Will this be in paper 1

[@solanada8450]

Yes

[@phabidz]

AS LEVEL 14/10/19, GOOD LUCK GUYS

[@Girlwithabook.]

Revising an hour before the exam 😂

[@joshhatchell7823]

First chemistry exam in like 30 minutes

[@kailenpatel3723]

Night before gang ayeeeee

[@rohanali7602]

In the cgo aqa book it says to measure 25cm cubed of hydrochloric acid not 30

[@Freesciencelessons]

The volumes are not critical as long as one of the reagents is added to excess in the end (in this case the sodium hydroxide).

[@theclutchhawk1034]

I am confused, the temperature of the solution will increase because it is an exothermic reaction, however doesn’t the temperature increase for an endothermic reaction?

[@Freesciencelessons]

In an exothermic reaction, energy is released from the chemicals to their surroundings. In this case, the surroundings is the solution that the chemicals are dissolved in, so the temperature of the solution increases.

[@theclutchhawk1034]

Thank you 🙂

[@theclutchhawk1034]

Thank you 🙂

[@Alex-xe3dx]

this is different to the cgp revision guide aqa practical

[@Freesciencelessons]

Any appropriate method is acceptable so you'll find different methods in different books / resources.

[@Alex-xe3dx]

Freesciencelessons okay great

[@yay1054]

At school we did more than one experiment (it also has more than one experiment in the aqa required practicals lab book). We did dissolving ammonia chloride, displacement of copper, magnesium and acid, hydrogencarbonate and acid. Do i need to know all of these experiments or is it only the Neutralisation one in this video?? Pleaseeee reply!!! I have mocks soon!!!!!

[@HarryGradon]

Test tommorow 💀

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Noice

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If you ever need a kidney, I have two.

[@tomdw5547]

Test tomorrow, good luck.

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Good luck to you too.

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g'luck !! we'll do amazing cos of these videos lol

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You too

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good luck

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Fail time!

[@meganjaneplatford8998]

THIS CAME UP AS A SIX MARKER- THANK YOU ANGEL!!!!!!!

[@quantumgroovytime]

I swear this comment section is so wholesome. And to anyone taking exams, good luck!! Hope you do well

[@xfreja]

tbh i just hope next year’s exams are either easier or just cancelled altogether

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@@xfreja year 10? I am. I’ve got all my mocks lol this week so I’m bashing out his vids

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nice pfp

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Love the new suit fam 🔥🔥🔥

[@Hannah-rs5oi]

For those taking AQA Chemistry in 2022 this is one of the core practicals that questions will be asked about along with the crystallisation of insoluble salts and titrations. Good luck everybody!

[@yorambo2857]

for higher?

[@multipliersupreme213]

Only titrations if you are doing triple of course.

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Good luck today test in about 2 hours

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it's todayyy

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@@rohitadyanthaya7600 what did u get?

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Good luck in your chemistry exam 🙏🙏🙏👍👍👍👍

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thanks bro

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thanks my g

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papa bless all our souls 🙏🙏🙏 🙏🙏🙏 🙏🙏🙏 🙏🙏🙏

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you too

[@essigrace]

🙌🙌

[@hayam1956]

just finished binge-watching the entire 2022 playlist triple paper 1 ready for tomorrow 😭#gcse2022

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cmon me too g

[@interimterminal]

literally me rn

[@emmybowyer8728]

Literally same

[@jonny6421]

same bro

[@michaelavangeffen7506]

same. best of luck today!!!

[@OrviC]

Haven't had a chemistry teacher for the whole half-term, my test's tomorrow and I'm trying to learn everything now

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you saved my life today in biology I can't thank you enough your a true hero and living legend!!!

[@asal9654]

Honestly

[@goob8945]

this is chemistry, wrong turn

[@eagleflies9515]

Which paper did you do?

[@henrys8178]

Can you do a playlist with all the required practicals in? Thank you!

[@pandafish392]

He has

[@full-timetbzpopper2764]

A LIFE SAVER THANK YOU SO MUCH

[@maddien9]

I have a question- in the advanced information for this years GCSE's, it says I have to know how to investigate temperature change in metal + acid reactions, carbonate + acids reactions, and displacement of metal reactions. Would I use this same method for all of these reeactions to measure temperature change? :)

[@phiebondie]

yes, it is the same for each

[@hk_03]

there is 10 hours till the exams and I'm cramming like I always am good luck guys

[@Shxynev]

wait so is there an actual reason for the lid as well or is it the same as the reason for the polystyrene cup? Thanks!

[@Freesciencelessons]

It simply reduces thermal energy transfers (just like the polystyrene cup).

[@Shxynev]

@@Freesciencelessons thanks!

[@dma7704]

it reduces heat loss to surroundings; basically you want to make sure that as little heat escapes from the system as possible

[@ellenweston3932]

If it releases energy, how come the temperature increases? Sorry if it's a stupid question aha

[@JamesHoyle.]

The temperature of the surroundings increases. It is the surrounding temperature we ars measuring, not the internal reaction’s, but no i wouldnt say thats a stupid question.

[@emilliepatching9061]

Also because its an exothermic reaction

[@mylessmithrobinson6169]

The energy released is thermal energy

[@JG-qo1os]

I had the same problem but this is your answer: the reaction occurs between the particles and energy is released from that. As exothermic reactions release energy then the particles release energy to the liquid/solution they are in. Meaning the solution we measure the temperature of will increase

[@JG-qo1os]

Well I guess its too late.

[@MF-wg5xy]

It came upp on the exam(combined higher)thanks for giving me free 5-6 marks❤️

[@sonam10107]

day before mocksss

[@jessbrownley1855]

Your videos saved me at gcse!! Are you going to do alevel videos? Thank youuu

[@siamsama2983]

Jess Brownley he probably will, after he is done with GCSEs. Maybe the IB too...

[@awaqaaqawa9802]

I found the exam quite easy as electrolysis, temp changes and titration came up on the triple higher paper.

[@astereyee]

You're actually amazing

[@axcelhehe1105]

The paper’s on Monday. Aiming for a 8 😄 Got a 5 in the mock Pray for me

[@imychallinor9200]

What does it mean by 10 cm cubed SO CONFUSED

[@dann7598]

It’s the unit for measuring a solution I think

[@imychallinor9200]

1 omg thank you so much lol

[@fireemperorzuko8756]

It's the unit or volume, we use it when measuring how much something contains, so it's used for solids, liquids and gases but in this video just for liquids