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!
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
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
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.
I’ve got a Chemistry exam tomorrow and you are the one person who’s made me more confident in my Chemistry knowledge. I feel ready now, thank you. You’ve taught me more than I learned at school.
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 🙌
I cannot explain how much these videos have helped so far with chemistry and biology I've just started with year 10 and in year 7,8 and 9 I've never been great at science because I am not very good at focusing for long periods of time in class when I get home I will watch your videos and I am completely caught up these are also amazing for revising and such a good length for me to focus and take it in thank u so much
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)
@@hh4251 LMAO im actually sorry to hear that but the sudden change in demeanour is funny ,well at least it was mocks. hope you got good predicted grades
The best educational channel I have ever explored. It's so underrated even though it deserves to be the most famous channel. You're not only helping us but indeed making our future brighter and better. It's so interesting to learn by your channel. I am going to have my assignments and your videos are helping me so much. 🥰🤗😊 KEEP IT UP !🤩🤩🤩
I don’t know but I always find chemistry hard and difficult and all the times I fail it now I have an exam after 5 days and I’m learning and trying to get it from your videos which are very understandable and made me have hope in the coming exam I wish I do better this time
You are honestly Godsent 😭😭😭i was supposed to study for chem at 8pm but overslept nd woke up at 01:30 am😭😭😭i have an end of term test at 07:30 tho so this was very much helpful
@@hearttwinz4209 um i failed my chemistry it ended up ungraded but im currently working my dream job but will continue my studies to futher explore my dream life
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.
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!
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
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
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!
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!!
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 😅
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.
![ILLSLICK - WINTER IS COMING [Official Video]](http://i.ytimg.com/vi/dwTMeM1zIhQ/mqdefault.jpg)
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
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
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.
Good luck w the GCSE’s mate 🙏🏻🤞
Bro what💀 im in year 8 and im taking the trends in group 1
@@kode9716 I am in class 7 and have to study it :( From Bangladesh 🇧🇩
IM DOING THAT TOO RN!!
How did it go? Did you do well in your GCSES?
Who else got 2024 Chem coming up??? Edit- Paper 1 was acc decent! Best of luck for paper 2 x
Checkpoint exams 😮💨
Me😭
@@Baddie.k.c I wrote it yesterday 😭 I'm cooked
Tomorrow
P4 went well
P6 soon
people who dislike these videos probably just failed their exams and are salty.
pun intended?
You will never know
correeccttt
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And people who sub are explosive Fans
I’ve got a Chemistry exam tomorrow and you are the one person who’s made me more confident in my Chemistry knowledge. I feel ready now, thank you. You’ve taught me more than I learned at school.
😅how was ur exam?
@@Arsu7ccp I got 84% which was one of the highest marks!!
@@jeyderdubz congrats
I failed in Chemistry yesterday but now i feel that you can save me. Thank you so much for this amazing video and great explaination
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 🙌
@@Cognitoedu hi
@@Cognitoedu you guys are actually so sweet. thank you so much
@@sohana.06 nah ha u lying , u just want him to reply back to your message. U faker
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I cannot explain how much these videos have helped so far with chemistry and biology I've just started with year 10 and in year 7,8 and 9 I've never been great at science because I am not very good at focusing for long periods of time in class when I get home I will watch your videos and I am completely caught up these are also amazing for revising and such a good length for me to focus and take it in thank u so much
Ah thank you so much, we're really glad the videos are helping and working for you 👍
That's a good strategy, i don't doubt you didn't get a 9
I don’t get how you don’t have a million subscribers, you are so helpful 😭
Went from a U in chemistry, to a 5 then a 7 thanks to you and free science lessons. Both of you are the reason why i am not failing my sciences!!
I love the hard work u put in your videos. This helped me in an online school project! You are the MAN!
What part of Canada r u from
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)
Watching this in 2020 and this is an amazing clip. It portrays everything you need to know in perfect detail so thanks so much
i had my exams a few months ago
i passed and now i have started my classes in MIT
all thx to this guy
thank u so much
me: *turns on subtitles so i can take notes more easier*
Cognito: Group one metals also erected rigorously when heated in chlorine gas
So helpful!! I've got my end of year exams soon, this is a big help!!
I was doing revision and didn’t understand untill I watched ur videos, thanks dude, hopefully I get good grades in my mocks
I got a C, omg that’s so shit
@@hh4251 LMAO im actually sorry to hear that but the sudden change in demeanour is funny ,well at least it was mocks. hope you got good predicted grades
This guys like the king of chemistry 🤴 👑
So true
I have science exam tmrw and this just saved my ass
Thank you so muchhhhhh , love you guys , i turned the post notifications on and am now going to recommend you to my friends!! :D
Ah thank you so much, we really appreciate it 😊
feel sorry for the year 11s 6 years ago who didn’t have these videos cus these are saving my exams!!
The best educational channel I have ever explored. It's so underrated even though it deserves to be the most famous channel. You're not only helping us but indeed making our future brighter and better. It's so interesting to learn by your channel. I am going to have my assignments and your videos are helping me so much. 🥰🤗😊
KEEP IT UP !🤩🤩🤩
Thank you for your
simplified and easy to understand videos. Much appreciated ❤
Thank you so much, my mocks are next week and your explanations are much better than the book, where it's all complicated!
your videos are honestly so helpful, thank you !
You’re very welcome - thanks for taking the time to leave a comment!
@@Cognitoedu OMG I’M YOURE BIGGEST FAN
I don’t know but I always find chemistry hard and difficult and all the times I fail it now I have an exam after 5 days and I’m learning and trying to get it from your videos which are very understandable and made me have hope in the coming exam I wish I do better this time
Literally I am addicted to your channel😂
Amazing video
You clear the concepts so well
Appreciable effort ✨
Thanks a lot 😊
I have chemistry exam today and because of you I'm gonna pass thanks for the help.
Seriously how can u not be subbed to this guy
I love Chemistry alot in ure videos i hve been able to understand more about Ionic Bonding thanks so much
I have an online test tommorow(its online because of you know what) and this is definitely helping me out! Thanks a lot mate!
I wonder how this kind of amazing videos been made? I mean which software do they use particularly
This helped me so much thanks for making this
What Tool Do you Use to make These Awesome Videos!
😁😁😁
This video got used for science lessons in my school
You are honestly Godsent 😭😭😭i was supposed to study for chem at 8pm but overslept nd woke up at 01:30 am😭😭😭i have an end of term test at 07:30 tho so this was very much helpful
this is what we are taking in class for exams and i wanted to summarize the chapters so i can study it easily and your video is what i am using
Hello.
Thank you so much this helps me alot in my IGCSEs
I'm so pissed that I didn't discover this channel earlier
so short, so helpful, perfect.
I have my GCSE exams in an hour so this is helping me lots
Good luck
How did u do
@@hearttwinz4209 um i failed my chemistry it ended up ungraded but im currently working my dream job but will continue my studies to futher explore my dream life
@@ezzatulhaziyah6645 well I hope u succeed I’m taking my gcse in a couple of months
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.
Thanks!
This topic became so easy after I watched this video cause I have an exam tomorrow and I’m gonna do great in it
Hey Hana hope the exam went well! Really happy to hear the vid helped you out :))
Cognito i have a chemistry test the coming wednesday. This video is very helpful. Thank you :))))
Thank you for this.......There aren't other videos for group 2 to 7 just like this😩😭
Thanks a lot I have an exam this Sunday and you helped me a lot never stop pls
Really happy to hear you’re finding them useful. Thank you!
You explain this muchbetter than my chem teacher
Came back to watch your videos again as for ive got my end of year exams tomorrow!!
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!
Cognito is great, honestly I don't know what id do without it
Thank you this helped so much. I could not understand what my teacher was saying but this cleared it all up. 👍
I’m watching this for fun and I totally did wanna know the peroxide/superoxide stuff
THIS MAKES SO MUCH SENSE NOW!!!! thank you so much
how would you know in an exam when sodium + oxygen will give you sodium oxide or peroxide
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
Why are you doing this at 11 years old????
I’m really late to reply but how are you doing GCSE at such a young age?
my school also starts the same time st Austins Academy in kenya chekkk it out
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
I really enjoy this video, it helps me a lot, but may you do the other groups as well?
this is when my bwain explodes- ( u explained it so well omggg....)
Saw this 3 days b4 exam. Thank you
It has been useful for my classes
This vid was really helpful. Thanks
What software do you use for your videos?
your saving me from failing my test tommorow
What are the properties of group 1 element
This video was very helpful thank you for your time and effort
If i pass it is because of you
Hi Nilu! Thank you for the lovely comment - but if you pass it’s definitely because of you!! Sending you good vibes! 🙌
how would we know the miltting point of the hydrogen'
your vids are great , i am learning lots
ty
U my sir is a legend
which video do we watch up to for paper1 of AQA?
Mannnn...i feel like god with this knowledge
Why do the melting and boiling points decrease??
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!
Cognito thank you very much! Well explained 👍👍
As mp and bp is inversely proportional to size
@@Cognitoedu tq
Thanks this helped me so much I’m in year 9 😭
your videos are officially visual education for my checkpoints
Thanks Shoyongdipto glad you're enjoying them 😊
I am actually loving ❤ your videos .Do you give tuitions?
Can you also tell us some important points on Igcse exams?
🤣😂😂😂
They don't but they have website which is helpful
What about density down the group?
2 guys walk into a bar.
One guy says “I’ll have H2O”
The second guy says “I’ll have H2O too”
The second guy dies.
I don't get it
This video is very helpful sir Thanks fou uplode this video 👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌
Glad we could help Bimesh 👍
Is it lithium oxide and lithium peroxide, or is it just for sodium?
this is so helpful in a levels too thank you
ughh i really dont understand the last bit about reactions
btw francium is actually less reactive than caesium
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!!
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 😅
By the way, chlorine isn’t in group 7 it’s in group 17.
So common salt has metal particles, thats interesting
So we are eating metal when we eat salt
Thanks so much!
You’re super welcome! Thanks for your support 🙌
Can you help with a question, please?
Why are S-block elements useful for drying solvents?
Thanks in advance
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.
which app do you use?
"common table salt doesnt just catch fire as you sprinkle it on your potatoes 😂"
Great video man!
Einstein's Favourite Student doesn't exis...
so easy to understand!!!
Thank you for the support man - really appreciate it 🙌
That's because you're smart
What is GCSE exams tell please. Is this useful to class 10
Lessen learned don't sprinkle cesium on fries
what's the dependent variable in this question
This is really helpful
Really happy to hear it - and as always thank you for the comment it really helps the videos get seen 💛
1:02 - 1:07 , i beg to differ
Thank youthis helped! God bless!
Your videos are very helpful but can you plz try to be a little more audible
Why is hydrogen not members of alkali metals?
Very helpful thank you so much