GCSE Chemistry - Relative Formula Mass #24

[@Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has been built to make learning and revision as easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

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Good luck to those doing chemistry tomorrow!!

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Thank you, I'm gonna fail😭

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Doing some revision video searching as this way of learning is always the best for me and so glad I found your channel! Your videos are so clear and easy to understand, especially with your helpful diagrams and images. You definitely deserve some more subscribers :)

[@Cognitoedu]

Hi Lottie thanks so much for the kind comments! Really happy that you find them useful!

[@Tsy172]

And I also want to say I had my chem mock today and your videos help me so much..your a lifesaver thank you

[@KimKimNim]

I actually finally understand. THANK YOU!!!

[@Cognitoedu]

Haha thanks Kim! Relative formula mass is a bit of a weird one to get your head around, so really happy to hear this was helpful 😇

[@ArmouredCat]

No problem

[@thesciencegenius1237]

Me too!

[@kingjarif6822]

@@Cognitoedu its easy

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@@kingjarif6822 for you that is, others not so much

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Love the simplicity in this video, so much easier. Thanks!

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So beneficial, thank you for your simplicity and clarity

[@Cognitoedu]

Hi Ahmad, really happy to hear you found it useful. Thanks for taking the time to comment, it really helps us out :)

[@NextGeneration_21]

Whys it gotta get so complicated so damn quickly?! I still don't understand even after watching this video. which is uncommon for me

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Simple. To the point. No messing around. Best video I've seen on RFM.

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This is the one stop tutorial guys so if u donno or find Mr mass finding hard its really simple with his explanation.... thx a lot

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😁

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This video is AmAzing. Couldn't really get my head around it when my teacher taught this... Thanks alot

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This channel is so useful I love the diagrams thankyou this helped so much

[@Cognitoedu]

Thanks, glad you're finding the animations helpful 😊

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his voice sets me at ease for somereason

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May Allah grant you peace and wealth, your videos are very helpful to anybody who comes across them!

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ameen

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Amen ya rab alalamen

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Why is no one liking ???

[@Cognitoedu]

I reckon they're just playing it cool...

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There being in COGNITO

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They are busy noting ❤

[@yimello_]

I don’t seem to understand this part 0:50

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youre a living legend

[@girlievisible]

in the definition of finding the relative formula mass did you mean to write: add together the relative atomic mass of all the elements in that compounds molecular formula?

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Hope you reach 1 M, you really deserve as lottie said

[@faithdzhangi8264]

Question here👋 is molecular mass measured in grams or no unit?

[@maixhsimo2306]

excuse me, how are you, what is the RFM of 0.3 g of oxygen and volume of 224cm cubic

[@oscillatefn8303]

Thanksss bro 💯🔥💪👍🙌👏🏅🥇🏆🌟🙏👏💰💰💰😁🙏👏

[@madelinerowland223]

i hate hate hate science🙄✋ur videos get me through it tho thanks 🏃‍♀️

[@m33sh50]

is the relative molecular mass the same ?in my spec (for igcse) it says calculate the relative formula masses(including relative molecular masses) from felative atomic mass

[@wasiulsami9338]

hi HEY! i finally understood thanks to you! my teacher did explain it but i didnt get it but thanks to YOU!!!

[@Seth-MAD-man]

Thank you . I might not pass but at least great relative formulas correct

[@0charlie_irl]

so true lol

[@0charlie_irl]

goodluck tmr

[@Tsy172]

your channel intro is so satisfiying jees

[@bb_hmk318]

i still dont really understand. I tried to do the last one with the oxygen by myself so i could just check the answer later to see if i understood, but i accidently used proton number in each element, after i got the answer i understood that and redid it. With relative atomic mass i got 43.8%, and the answers when i used with proton numbers where almost similar, the one with proton numbers was 43,2%, which is the correct answer as the video says. So what method should i use exactly? Does one decimal means anything or i could just use any of those two methods and leave the decimal behind?

[@wishmaker3952]

Thank you so much .I was so confused and worried about my exam 💗

[@Cognitoedu]

Glad we could help HHA, good luck 🤞

[@tanzimhasan5223]

I have understood all except the percentage bc I am confused about what I should do about the (32×1)/98

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I got chemistry mock paper 1 tommorow and I am trying to revise as much as I can to get moved to higher

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How do I do this topic since it doesnt show (in your website)

[@anushriprabhakaran2024]

Tq so so so much

[@tayebakhan428]

Can you make a video on molecular and empirical formulae please

[@sameerahfarooqi5326]

Soo underated!

[@kashafabbas5068]

Nice vid

[@St-jh8pk]

Hello there! I just wanted to ask if this is the same as relative atomic mass (with Isotopes)?

[@Ninjaboy26478]

Bro you made it so simple thank you I have chemistry test tommorow

[@maariyaahmed8421]

Thank it really helped me out I was looking at my region guide and I still didn’t get it it but thanks to u I appreciate that a lot

[@Cognitoedu]

Hi Maariya! Thanks for the comment, and really happy to hear it helped you! Good luck with all your work 🙌

[@maariyaahmed8421]

Thank you

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i hate quantitative chemistry

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open a school man\

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your video is very easy to understand ! thank you !!

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Already on 1K Subs.

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There were so many moments where I went "OHHHHHHH I GET IT NOWWW" Thank you

[@Cognitoedu]

Really happy to hear it!

[@kkkinich]

LIFESAVER. THANK YOU.

[@ziwu9665]

the video image is too poor, you need to fix it more

[@Cognitoedu]

Is you’re video quality setting turned down?

[@iknightcrawle1030]

You explain better than my teacherrr

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whyd ya only get 1 like but another person who said the exact same thing got 150

[@claudiubudeanu5962]

Thank you for this

[@lauramurdoch3765]

Does the critical temperature increase as the relative formula mass increases?

[@tezawr3963]

Thanks

[@zebreba2561]

So helpful thank you, my teachers are useless

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God Bless your mother

[@rubyreadal6607]

Thx you i finally understand what i thought was gibberish

[@rubyreadal6607]

wait i confused again

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[@Cognitoedu]

🙌 🙌

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Good video, helped a lot!

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Great video. Loved it !

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tysm

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you got 1 kilogram subscribers in a day wow!

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[@Cognitoedu]

YAY 🙌

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I never said thank you to you mate, you're awesome

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OMG!! thank you so much!! I have a chemistry test on this in a week and this defo helped me out!! :DD

[@Cognitoedu]

Ah so glad we could help, all the best with your test! 🤞

[@AB-wm6hp]

At 3:19 I believe a mistake is made. It should be 16 + 1 (Oxygen + Hydrogen) which equals 17 (the relative formula mass for OH i.e. Hydroxide). Then 17 is multiplied by 2 as there are 2 hydroxide molecules present which equals 34.

[@marceledeko6030]

nope cuz we r looking for the mass in oxygen not in hydrogen and oxygen

[@kashafabbas5068]

Cuz this much knowledge cannot be explained by a mortal human

[@ChitranganiSuryawanshi]

Amazing explanation. Understood really well!!

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Tomorrow’s my chem. exam Help!😢

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this helped me out so much. thank you!

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[@Cognitoedu]

No problem 👍

[@mannanhanda5564]

Hello! What if we have something like 2H20?

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This guy deserves an award or something your gonna save me from my cies❣

[@Cognitoedu]

Aah thanks Naseem, good luck with your cies 🙏

[@xml_rblx9576]

this is the first time I do not understand anything in Cognito's video

[@nancydong-djy]

Bro I’m using gcse chem to revise but i study ncea

[@omar.t975]

i think you made a mistake at 1:55, 32+1+64 is 97, not 98.

[@Cognitoedu]

Thanks for the feedback! I think you might be missing the second hydrogen in your workings?

[@omar.t975]

@@Cognitoedu ohhh yes, sorry my mistake 🤦‍♂️🤦‍♂️😅

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Man! Cant express my gratitude to you

[@Cognitoedu]

Thanks farida!!!

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Do you have a video covering empirical formula?

[@lammieshipper]

tysm i used this to revise for my end of years

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Hey for the the last question when it said 74 where did you get that from?

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Ar vs Mr which one is it? i got taught in skool that it was Ar

[@GoodChemistry]

Another great and simple explanation, thank you.

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[@باسلعبدالله-ن7م]

great as always