GCSE Chemistry - Group 1 Alkali Metals #11

[@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 built specifically to make learning and revision as quick and 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 at a glance 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 huge bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

[@lyndsayquinn8415]

I use these videos a lot and always direct my students to them but there is a mistake in the video. Chlorine gas has the formula Cl2. They often ask this type of equation in the exam and it is really important to highlight that they are diatomic and need to write the correct formula. Thanks

[@not_today_x]

Who else got 2024 Chem coming up??? Edit- Paper 1 was acc decent! Best of luck for paper 2 x

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Thank you so much. I’m currently in year 11 with 8 months left until GCSEs, I’ve never understood chemistry and just decided I would fail the GCSE but over the past few days I’ve worked my way through 9 of your videos and I actually understand what I’d never understood in class. Just another 68 videos to go haha.

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Bro what💀 im in year 8 and im taking the trends in group 1

[@nashpoti2191]

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[@XinTing1218]

Recap (for myself) Alkali metals -grp 1 - soft, low density, low melt/boil points -top is less reactive, doqnwards more reactive - want full valence shell so minus outermost 1 electron (cuz its grp 1) - more reactive downwards as distance between nucleus n valence shell larger Ionic compounds -Ionic bond -white salts, water soluble Reactions Alkali + H²0 → metal hydroxide + hydrogen gas (reacts vigorously) + Cholrine gas → eg. NaCL (vigorous) +Oxygen → metal oxide (eg. Sodium peroxide Na²O² sodium oxide Na²0)

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[@Cognitoedu]

Hiya mate, thank you for such a kind comment - and sorry to hear about your struggles with chemistry yesterday! You’re super welcome for the video - really hope they can help you get your head around the main concepts! The most important thing with your revision is not to let it get on top of you :) just do a little bit every day and make sure you understand the bit you’re doing. That way you build up a really solid knowledge base that helps you learn the other material too - everything fits together!! Good luck 🙌

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Ah thank you so much, we're really glad the videos are helping and working for you 👍

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me: *turns on subtitles so i can take notes more easier* Cognito: Group one metals also erected rigorously when heated in chlorine gas

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Ah thank you so much, we really appreciate it 😊

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[@Cognitoedu]

You’re very welcome - thanks for taking the time to leave a comment!

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who else is watching one day before exam

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[@Cognitoedu]

Thanks a lot 😊

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Really happy to hear you’re finding them useful. Thank you!

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Sodium chloride doesn't catch fire when you use it on food because ithe sodium is already oxidised. Sodium metal would catch fire if you put it on your chips...especially if you added vinegar. Likewise rubidium salts are not particularly reactive obviously rubidium is.

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Cognito i have a chemistry test the coming wednesday. This video is very helpful. Thank you :))))

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Thank you so much this helps me alot in my IGCSEs

[@tvshowedits4220]

Why do the melting and boiling points decrease??

[@Cognitoedu]

Hey, you shouldn't have to worry about that for GCSE. But out of interest - it's because the metallic bonding between the metal ions and their delocalised electrons gets weaker. This happens because the ions get larger as you go down the group, so the density of positive ions / negative electrons decreases. So the weaker bonding would require lower temperatures to break. Hope that helps!

[@tvshowedits4220]

Cognito thank you very much! Well explained 👍👍

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As mp and bp is inversely proportional to size

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This topic became so easy after I watched this video cause I have an exam tomorrow and I’m gonna do great in it

[@Cognitoedu]

Hey Hana hope the exam went well! Really happy to hear the vid helped you out :))

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how would you know in an exam when sodium + oxygen will give you sodium oxide or peroxide

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What are the properties of group 1 element

[@icicmgolocc2ndmq194]

I really enjoy this video, it helps me a lot, but may you do the other groups as well?

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which app do you use?

[@humnahnadeem1318]

which video do we watch up to for paper1 of AQA?

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At 2:17, is the 'attractive force' called electrostatic force?

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how would we know the miltting point of the hydrogen'

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[@ahmadshafiqzia2087]

What about density down the group?

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[@Cognitoedu]

Glad we could help Bimesh 👍

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I'm currently 11 years old and am at first GCSE since in my school gcse start at 7 th class so this subject has been really hard for me and I currently am really behind at it but after watching some of your vids I can actually get better understanding lol thx for the video and hope this time I will get better marks in my exam

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Why are you doing this at 11 years old????

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I’m really late to reply but how are you doing GCSE at such a young age?

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ughh i really dont understand the last bit about reactions

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Lessen learned don't sprinkle cesium on fries

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[@Cognitoedu]

Thanks Shoyongdipto glad you're enjoying them 😊

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your saving me from failing my test tommorow

[@djdiamondmind2043]

Is it lithium oxide and lithium peroxide, or is it just for sodium?

[@drmariagill]

Saw this 3 days b4 exam. Thank you

[@afahadd08]

what's the dependent variable in this question

[@aadiyajwas5275]

I have a question, I understand the trend that as you go down group 1, the reactivity increases however why are alkali metals more reactive than transition metals such as copper (which has multiple charges such as +1, +2 etc). Thank you!!

[@ak24032]

I think this is because they only have 1 outer shell electron to lose, so it takes less energy than it does for transition metals? Not completely sure myself 😅

[@ameliaskill6450]

Can you help with a question, please? Why are S-block elements useful for drying solvents? Thanks in advance

[@antonroy415]

The non-reversible nature of reactions mean that such metals are very useful for drying many kinds of solvents. The s-block metals are used as reducing agents for an immense number of different types of compounds.

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your vids are great , i am learning lots

[@nathangoitom6779]

Why is hydrogen not members of alkali metals?

[@timkoepsell1098]

Much like Ian Kim, I'm using this for my 8th Grade Science class. It presents what can be confusing concepts very clearly. The animations are simple and yet engaging. It will serve as a good introductory video to our study of Alkali Metals. THANK YOU!

[@user-pi6hr3se8i]

GREAT video however you forgot to show chlorine as a diatomic molecule in the reaction with the alkali metal. Also I was wondering how alkali metals can be ductile even though they are metals. They seem to be too soft to be pulled into wires

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Einstein's Favourite Student doesn't exis...

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ty

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It has been useful for my classes

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What is GCSE exams tell please. Is this useful to class 10

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Hey cognitio is this a paper 1 topic

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this is when my bwain explodes- ( u explained it so well omggg....)

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Nice presentation 😊

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So common salt has metal particles, thats interesting

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So we are eating metal when we eat salt

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Bro puts caesium on his potatoes

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This is really helpful

[@Cognitoedu]

Really happy to hear it - and as always thank you for the comment it really helps the videos get seen 💛

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They don't but they have website which is helpful

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This vid was really helpful. Thanks

[@dumduckling588]

diff voice actor??

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I’m watching this for fun and I totally did wanna know the peroxide/superoxide stuff

[@scythe_hydra9680]

btw francium is actually less reactive than caesium

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Mannnn...i feel like god with this knowledge

[@shittech2566]

Why do they increase going down tho?

[@zahrahassan7023]

your name explains