GCSE Chemistry - Group 1 Alkali Metals #11

What are alkali metals? Why are they so reactive? What are the trends as you go down the group? How do they react with water, oxygen and chlorine? Learn all this and more!

[@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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[@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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[@Cognitoedu]

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

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Thanks Shoyongdipto glad you're enjoying them 😊

[@judepeel3822]

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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Thanks!

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

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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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Saw this 3 days b4 exam. Thank you

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

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[@Cognitoedu]

Glad we could help Bimesh 👍

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This vid was really helpful. Thanks

[@icicmgolocc2ndmq194]

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

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your vids are great , i am learning lots

[@scythe_hydra9680]

btw francium is actually less reactive than caesium

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This video was very helpful thank you for your time and effort If i pass it is because of you

[@Cognitoedu]

Hi Nilu! Thank you for the lovely comment - but if you pass it’s definitely because of you!! Sending you good vibes! 🙌

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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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Lessen learned don't sprinkle cesium on fries

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

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[@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 😅

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What are the properties of group 1 element

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ty

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I am scrolling through the comments trying to find someone reacting the the white solids

[@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!

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

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What about density down the group?

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how would we know the miltting point of the hydrogen'

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

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[@Cognitoedu]

Ah wow, thank you, we're really glad we could help you out! 😊

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Bro puts caesium on his potatoes