Alkali metals reacting with water, comparing lithium Li, sodium Na and potassium K as they react with water in the presence of phenolphthalein. Buy my book here www.amazon.com/No-Teacher-Lef...
I actually did this myself last year in school, it was quite fun! Well, I did lithium and natrium (you call it sodium in the US), the teacher did kalium (potassium) and then showed us a video of all five. Rubidium reminded me of fireworks, and cesium blew out the side of the bowl.
@@DA20052 I'm from Sweden but I was a foreign exchange student in the US at the time. I remember I kept having to remind myself to use the English names of the elements.
i have never seen someone using the word natrium as an equivalent to sodium besides in element symbol nomenclature, so it’s pretty cool to see that a country - a north Germanic country no less - uses the Latin word for it.
Same with ours, he tried lithium, then sodium then he did potassium which reacted so aggresivly it shot up to the roof and made a small hole, it was really funny
This is a great demonstration and it never gets old! The action lab here on RU-vid did a video that was sodium into sulfuric acid. Very cool but extremely violent its worth a see.
Good work. I did the reaction with Natrium and water. It first melted and after that ignited. Shortly after that exploded with a short and loud sound, continuing to burn in the air. I love this metal. But I've never had more active metals.
Does anyone here remember the DC comics in the 70's with the metal eating alien sponges? I think they must've got the idea from methyl orange as when you heat it up it rapidly swells up and becomes just like a sponge and it also eats holes in metal as anyone who has ever had a chemistry set as a kid will know.
Thanks so much for the youtube, I am a science teacher and I wish I could do this in my class, but they will have to watch it on youtube instead...we are under strict lockdown.
If you put a bit more sodium and a bit more potassium you'll notice that sodium creates a power explosion because of the spikes compared to potassium because of coulomb explosion.
As another video with more of the alkali series shows, the further down the column (on the table of elements) one goes, the more reactive the metal is with air and water. Cesium, in particular, doesn't float, so it sinks like a rock then the hydrogen flare basically detonates in the water like a depth charge. Rubidium I have yet to see go in the water, but I'd bet it would be memorable...
Brady Haran videos this experiment and has it here on youtube! The following is a link to his video on the reaction with Rubidium and water. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-iP6CRZdDu6o.html
Good evening Scott. Is there a way to email you? I would like permission to make use of your video with some of groups. I teach EAL students and I would like to make use of your video. Thank you for posting all these great videos!!
I don’t know if he ever got in touch but if not there are often links in the profile about page. He has one to a blog and some other links it seems which may allow you to make contact.
2:04 Nice explanation and lesson, but I found it kinda funny because it sounded like someone got their finger stuck in a HIGH VOLTAGE SWITCH, and the switch got shot!!!😂🤣😅😂🤣😂🤣😂🤣😆😆😆😆😆
My chemistry teacher once showed us the reaction of water and sodium. So sad that I cannot show it to my students now because there are so many limitations on chemicals in the place where I live now
potassium in its neutral form is reactive due to the final valence electron being very easy to remove. Charged potassium in a banana or supplement already has that electron removed so the properties differ quite a bit.
Die Reaktivität der Alkalimetalle mit Wasser nimmt in dieser Reihenfolge zu: Lithium, Natrium, Kalium, Rubidium, Cäsium, Frankium. Woran liegt das? Nun, schauen wir uns doch mal den Aufbau der Atome an, bei jedem Alaklimetall in der Reihenfolge, wie sie im Periodensystem stehen, wenn man es von oben nach unten sozusagen liest, kommt eine Außenschale dazu, die Elektronen sind immer weiter vom Kern entfernt, man kann sie also immer leichter entfernen, die Ionisierungsenergien liegen immer niedriger, dementsprechend ist es leichter, sozusagen Elektronen von Frakium aus seiner äußersten Schale zu entfernen, als von Lithium. Die Elektronenaffinität der Nichtmetalle nimmt genau in der entgegengesetzen Richtung zu, Fluor ist demnach das reaktivste Nichtmetall, sowieso ist es das reaktivste Element, es hat die höchste Elektronegativität, dies ist auch wieder auf den Bau der Atome zurückzuführen.
It's an indicator called phenolphthalein. It turns colourless in acidic solutions and pink in basic solutions, so for this video, it's just to show that the solution was alkaline after the metals reacted (forming metal hydroxides). :)
It's an indicator called phenolphthalein. It turns colourless in acidic solutions and pink in basic solutions, so for this video, it's just to show that the solution was alkaline after the metals reacted (forming metal hydroxides). :)
