"And 5, if you're a mathematician, you will know is half of 10" This is some advanced math right here lol.

@KajoFox

9 жыл бұрын

Actually, if 0 doesn't exist, half of 10 is 5.5

@WaltRBuck

9 жыл бұрын

Haha I love when he gets so seriously sarcastic in a playful manner without barely cracking a smile.

@baarni

9 жыл бұрын

pipnina Not true....zero is not a factor so is not relevant.

@KajoFox

9 жыл бұрын

baarni Get 10 things, pick the middle one. 10 is an even number and there is no integer middle value when the value represents objects in a line.

@baarni

9 жыл бұрын

pipnina yes correct. Therefore you cannot halve the sixth item to create 5.5 otherwise you would only have 4.5 things in the second half of your division as you originally stated. Messed up hey...So to halve 10 items you can only have 2 groups of 5 with a divide in between....;-p You just contradicted your first statement

I like the phrasing of that... "Forgiven in the interest of science."

@empiricalandinquirical2435

9 жыл бұрын

It is a great line, and he's lucky. I'm usually punished in the name of science.

@xnax1993

9 жыл бұрын

Somebody should make a shirt out of that. Something along the lines of "Forgive me in the interest of science."

@dijjit

9 жыл бұрын

Josephiroth Nom nom babies.... "oh dont mind him... hes doing it for science".

@RomanNumural9

9 жыл бұрын

Josephiroth FOR SCIENCE!!!! It is like the Leroy Jenkens of the real world.

@EtzEchad

4 жыл бұрын

His parents might've forgiven him, but I bet his sister didn't.

*"Brringht grreen."* at 7:15 Poliakoff's cover has been blown, he is definitely Scottish.

@derkateramabend

9 жыл бұрын

You think so? The name Martyn Poliakoff sounds rather slavic to me...

@pixelmaniac8534

9 жыл бұрын

derkateramabend Sir Martyn is of Russian descent, but I firmly believe that it's a cover.

@pixelmaniac8534

9 жыл бұрын

***** I happen to be from Sweden. The "grreen" sounded different and I just jumped to the first dialect I could think of when I wrote the comment. There's no real thought behind it.

@AmisTheos

9 жыл бұрын

Pixelmaniac I don't mean to hate on you like that Michael guy did but the prof's accent didn't change at all :') literally all he did was roll the R, also Scottish isn't a dialect it's an accent (semantics I know).

@ronaldderooij1774

8 жыл бұрын

+Pixelmaniac He is in fact a Russian spy, working for Putin.

"and if you're a mathematician you'll know that half of 10 is exactly 5". The professor cracks me up :D

@BornAgainCynic0086

9 жыл бұрын

***** In the name of science, forgive him!

@daedra40

9 жыл бұрын

Jeff H And in the interest of science, he was forgiven.

@tomahawkmissile241

4 жыл бұрын

I bet you still remember it’s 5!! That’s why he did this to help you learn!!!!!

"Manganese is actually a much more interesting metal than you might think." ...I had no preconceptions

We had a joke in AP Chem back in high school about disguising a potassium permanganate solution as grape kool-aid by putting it in a pitcher in a refrigerator. A rule of thumb, we figured, is to never trust a chemist's fridge.

I wish I had the "Forgiven in the interests of science" excuse when I was younger.

"Used a spoon and a gas stove." This is a syringe away from being very dangerous.

@sydhenderson6753

2 жыл бұрын

Especially to items of clothes,

The brown manganese dioxide spots can easily be removed with vitamin C. Just use apple juice, an orange or just a vitamin C tablets to reduce MnO2 to Mn2+ and flush it well.

@maskedmarvyl4774

Жыл бұрын

Where were you when he was 15??

A Reddit discussion thread for this video: redd.it/2yhmrv

@mdome8584

9 жыл бұрын

Make a video on Caesium Hydroxide! The strongest base.

@ravenlord4

9 жыл бұрын

It's a pity that you have gone to the dark side by using reddit, the cancer of KZread and life in general. (tips fedora and unsubs)

@tyepowers5536

9 жыл бұрын

raven lord How thick can a person get?

@MangoesXx

9 жыл бұрын

zoey Quay He tipped his fedora. That already speaks to what kind of person he is.

@alexproshkin7892

9 жыл бұрын

uploaded on my birthday! :)

I don't have to watch the animese because I read the manganese.

@redtails

5 жыл бұрын

your proteins are a polymer of anime acids

@SirJeff

4 жыл бұрын

redtails excess anime acids are deanimated in the liver

@michakrzyzanowski8554

3 жыл бұрын

japanese manganese

@danielbaird6662

2 жыл бұрын

Ah, I see you are a fellow manganese of culture.

Where I grew up you could buy potassium permanganate crystals in the pharmacy without a prescription, to make light pink disinfecting wound washing rinses (weaker than bleach, you also could get tincture or iodine), but we as 9 year old kids would buy a packet of like 1 gram, and use the crystals to create artificial sneezes. You pick out a crystal and stick it in your nose, and it's an instant sneeze. I only did it like twice in my life, but some of my friends found it so interesting that they did it over and over and over and I'm like dude, you're messing up your mucuous lining like that, and creating permanent damage or something. Crazy! We also used to shave match heads into a loud noise making device, made of two male screws screwed into a female one from the opposite side, and a piece of shopping bag tied around the end of one of them, which, when you throw it up in the air, becomes the tail as the screw contraption falls down, guaranteeing that it will hit the cement sidewalk tip first. So you unscrew one of the male screws, and shave some match heads into the chamber between the two screws, then screw it back on fairly tight, and throw it up in the air so when it lands it hits the cement floor. Booom! Fun, fun fun! We also stole calcium carbide from the welding generators at the nearby construction site, and put it in a wine bottle the alcoholic construction workers left empty around the construction site, with a cork, so you fill it with water, drop a piece of grey-brown carbide covered with white lime, and plug the cork, and 30 seconds later pop! it shoots it up into the air. I'm thinking H2O2 with a drop of MnO2 catalyst into it would also do it, unfortunately the reaction rate is too uncontrolled between MnO2 and H2O2, unless you use a small piece. MnO2 is also a great O2 generator catalyst when trying to get O2 out of KClO3 or KClO4, which, when heated, have a high decomposition temperature, or KClO3 actually turns into KClO4 without decomposition, but in the presence of a little MnO2 it comes out fast. MnO2 like PbO2 is also a great Cl2 generator from HCl, maybe from bleach too, and I think I read somewhere that cobalt gives you O2 from bleach while manganese and lead give Cl2. PbCl4 might exist at some low temperature and decomposes at something like 5C, I'd have to look it up, like chlorine hydrate is also stable at low temp. I don't know about MnCl4 if it's ever stable, but Mn2O7 exists for sure, and it's wild.

@nessunodorme3888

4 жыл бұрын

Thanks for all these tips!

@SirJeff

4 жыл бұрын

Here I can get 100g of KMnO4 crystals over the counter for $10. Then I chuck some of it into glycerol from the baking store and watch the show

I am from the U.S. and i absolutely love your videos! I had always had an interest in Chemistry as a kid and these videos spark that interest alive again! Thank you guys for all that you do for science! P.S. Sir Martyn, I love your hair m8!

Magnetic salts... wow! Never knew that. Chemistry is so amazing!

Brady I liked those types of videos since I first noticed your channels, but man, you have really stepped up with PeriodicVideos. It is so professional and detailed now, you just have to love it! :D Thanks for making all of these fascinating videos!

Periodic Videos, I've been a long time subscriber, I love Professor Poliakoff! It's partly thanks to you that I started making my own science videos (in fact I uploaded my first videos only last week!) in the hopes that I can help more people become interested in learning about Science. And if anyone here is interested in watching other science-based videos, please give my channel a try! I strive to make my videos as visually appealing as possible, and as a grad student who is trying to put himself through school while also supporting his parents, your support and viewership would be much appreciated! Thank you guys :D

@insanomonkey

9 жыл бұрын

i was gonna skip past this comment cause it sounded like spam, but i actually looked at your videos and i love your intros

@MultiElementalgamer

9 жыл бұрын

*sir, not professor. He was awarded the title quite a while ago

@SidCurry

9 жыл бұрын

Greg Addams I know, but he had said himself that he prefers to be called professor by students :)

@ToniT800

9 жыл бұрын

ScienceSid As advice, you could make the intro into your video a bit shorter(or remove it completely), and stop using CAPS IN YOUR TITLES TO DRAG ATTENTION=)

7:15 "Brrrrrright green"

Manganese is one of my personal favorite transition metals. It has many different colored salts, the colors can be easily changed through redox. Its oxides are strong enough oxidants to generate halogens (primarily what I use them for). KMnO4 makes spectacular pyrotechnic reactions with reducing agents as well. KMnO4 can also be converted to Mn2O7 with sulfuric acid. I've done so before and it is so reactive that it instantly ignites/detonates substances such as alcohols on contact.

"5 if your a mathematician, is half of 10". HAHAHA!!

I love the very beginning of this video where hes shaking his hands "manganese" I dont know why but its kinda funny

@wread42

8 жыл бұрын

I was just about to post exactly that comment.

"Forgiven in the interests of science" a phrase I wish I heard more often

I wish, i had The Professor as my teacher in the college, i would have Earned a gold medal. His explanations are always easy to understand. Simple.

The beginning of the video was not properly accompanied by sound, so I went back 10 seconds. Now I am stuck giggling and having fun, hearing him pronouncing "manganese!" in such a passionate way, over and over again 😂

Great shots getting the different varieties of Mn dissolving in the liquids; those were truly terrific. You don't have to rack (DOF) focus in each video. It seems that you always make a point to do so.

i love how you wave your arms in the beginning, it gives you all the credibility in the world as a scientist in my opinion.

So happy to see fresh element video :))

A year ago I did some different experiment that also led to Potasiummanganate. Whats intresting about K2MnO4 is that it gets oxidizied to KMnO4 very quickly while in contact with air (or oxidants) but can be stabilized as cristal water in KOH or NaOH that is used for the reaction.

This was a much more interesting video than I thought going in. Thanks!

As a man trained in wilderness survival, I've learned a way to start a fire by combining potassium permangenate and glycerin, unique energetic reaction highly useful in getting a fire going. Always keep both in my survival backpack.

Can't get enough of these videos.

You guys should do a follow up video on electrons and their states and orbitals. I think it might help the understanding of transition metals and why they're so special.

Thank you guys! I am in the 8th grade and we are just starting to learn about the elements! These videos really help me understand the material.

@mathieuschuler366

2 жыл бұрын

@Комендант Sixto goddannnggg thanks for replyin!

Hi, great video. I'm surprised the reaction of permanganate and glycerine wasn't mentioned. Reduce the permanganate crystals to a powder with a pestle and mortar and arrange in a pile (like a small hill). Drip some glycerine on top and it should start to catch fire, looking like a volcano! The permanganate is a powerful oxidant and the glycerine is the fuel.

Brrrigt green LOL :D

"Forgiven in the interest of Science". What a great line. =3

Yay! New video! I've been wondering when we would get another :)

I love the roll on the r in “bright green”

I don't think enough people have commented on all of the wonderful accents on these videos, beautifully varied.

Manganese: one of the best elements ever.

It has 5 d electrons in element form too so why isn't it magnetic in element form

Thank you Prof for another great video!!

I love how he always persuades people to do experiments.

Not every scientist can boast of such a sense of humor and the ability to create a positive attitude :)

Great video

pretty wild how manganese can change its colors, when out prospecting the purple color is usually an indicator of the presence of manganese.. this has to be one of the more interesting video series in youtube!

Potassium permanganate is also used to make water safe to drink, so it's pretty and useful!

@thetruthmustbetold6999

7 жыл бұрын

The ryme is if its pink its safe to drink

thanks prof for another great video

One of my favourite minerals is rhodochrosite (and rhodonite), and both are gorgeous pink! I should mention they're both manganese carbonate (if I remember correctly). I'd love to see the professor with a sample of rhodochrosite from Sweet Home Mine, Colorado

Hm, i don't get it. If metallic Mn has 5 d-electrons , which are unpaired, it should be also magnetic as metal. Or do i miss something?

Great another video i love learning this stuff!

In a standard D battery there is a copper electrode surrounded by manganese dioxide soaked in ammonium chloride solution. I used to mix this manganese dioxide with aluminium powder and obtained a thermite reaction but didn’t see any manganese. I suspect it burned in the heat of the reaction. Later I read this MnO2 mixture with aluminium could be explosive so I didn’t do it again. It wasn’t randomly thrown together, it was in stoichiometric proportions and even small quantities could be ignited with a blowtorch.

1:35 this is why we love the professor!

I love manganese chemistry. I was hooked the first time I saw KMnO4 in water.

how the hell did he get his hands on this as a school boy even in the interests of science

@joshuarosen6242

8 жыл бұрын

I played with it when I was at school as well and I'm not as old as the Professor. Perhaps schools in England are more relaxed about this.

@Kizron_Kizronson

7 жыл бұрын

He probably bought it from his local chemist. Gotta remember that chemists weren't always just the place you went to to get medicine. Even today you can get all sorts of stuff from a proper chemist store.

@Tindometari

5 жыл бұрын

It was a different time. People didn't keep their kids wrapped in Nerf in those days.

Weatherford Elementary School in Plano, Texas, USA was here!

"I persuaded Sam"....wait that's not Neil.

Manganese: the element that is misread as magnesium

Put it KMnO4 on Magnesium and add a drip of Glycerin on it... *woshh* and then its snowing white particles (of Magnesiumoxide). That was the first experiment I did as a kid with my chemical model kit in my mom's kitchen. However I didn't leave brown spots either...

Manganese is not strictly in the middle of the transition metals, but it is one of the 2 yes, the other being Iron (as would be seen by a mathematician or more specifically a statistician). Idk why Manganese is more special than Iron, I am guessing it has got something to do with the half filled d-orbitals. Mn has all its d-orbitals half filled, but iron has one filled d-orbital.

@RickMason-yj7pv

4 жыл бұрын

Manganese is the central atom of chlorophyll. Iron has that position in haemoglobin. Almost identical molecules other than the central atom make normal blood and plant 'blood'.

When I was a kid 50 years ago, dentists used potassium permanganate solution as a mouthwash/rinse.

Keep up the great work and hope all is well

@tomahawkmissile241

4 жыл бұрын

I will take payment of gold in solution up to 32 oz or 1 giant flask of helium worth upwards of 20,000.

very educative. thank you regards,

During WWII, the United States removed the nickel from the alloy used in it's five-cent "nickel" coins (Cu75/Ni25) to, supposedly, divert it to arms production. They replaced it with silver and manganese (Cu56/Ag35/Mn9). As an indicator of the alloy change, the placed very large mintmarks above Monticello (Thomas Jefferson's home) pictured on the reverse. The color of the alloy is strikingly different to anyone familiar with coins. It is speculated that the true reason for the change was public relations - demonstrating reallocation of resources for the war effort - in an attempt to encourage scrap collection, etc.

"forgiven in the interest of science." Love that phrase

I remember using potassium manganate for showing convection currents in water

@RandomMan-nv2qh

5 жыл бұрын

And diffusion in water lol

These videos make me want to be a chemistry student so i can play with them

will magnesium in any way react with manganese?

Una traducción perfecta si señor

All through middle school, "Manganese" always sounded like some exotic nationality to me.

Best comment ever: I was forgiven for the purpose of science"

"Which is BRRRRRRIGHT green". That must be really really bright!

Manganese is one of my favourite elements although I like most of the common elements :)

Nice video!

Can we make a potassium permanganate crystals by normal crystallization??

Keep updating those elements!

While on the topic of the transition metals, can someone explain why iron, cobalt and nickel are in the same electron group?

That’s extremely interesting, magnetic salts!! Are there more and has anything come of it

So if you dye a shirt with the green stuff and then squeeze a lemon on them will they turn bright purple?

My friend and I tried to make a firework incorporating potassium permanganate, thinking that we would get purple sparks. It was just a kid's chemistry set from "Toys by Roy" so we failed to get what we expected.

3:04 white is a technically all colors.. so salts have narrowly defined colors in full frequency light.

Amazing

what about the effect of manganese on the human body???

It's interesting how the colours of the two compounds are on opposite sides of the colour wheel. Is thee any significance to that?

@wedmunds

9 жыл бұрын

PhazonSouffle Just molecular crystal shapes, nothing more.

@LardGreystoke

7 жыл бұрын

And karma.

0:27 As far as I know, zinc is not a transition metal since its d sub-level is completely full.

Do videos on electromagnetics

is the molten salt of Mg magnetic?

Dear Professor: You'd perfectly done a very entertaining and educational video, my compliments to any of the script integrity. Another thing thats pink besides a usual cats nose.

@josephforan1173

6 жыл бұрын

K2MnO3-potassium magnous?

Can someone explain to me what is happening in the reaction of Manganese Dioxide and Hydrogen Peroxide? I have done it (and recommend that others do too - you can get Manganese Dioxide out of lantern batteries along with carbon rods) and cannot find a definitive answer as to why the reaction happens.

@Rosie6857

7 жыл бұрын

The effect of the MnO2 is purely catalytic. It causes the decomposition of the peroxide into water and oxygen. I've done it at home, too, about 60 years ago. I've used MnO (starting as MnCO3) as a catalyst in a reaction between acetic acid and decanoic acid to form methyl nonyl ketone, which smells quite nice. This was perfume chemistry.

Years back when you could buy chemicals without being suspected of being a terrorist, i purchased potassium permanganate. Dropped about 500 grammes off powder on my kitchen floor. Thought it be a good idea to mop it up. My wife was fuming as it looked like someone had done a dirty protest on our new floor.

I have researched KMnO4's acidity, and it turned purple in water. It seems as if it is not acidic at all.

Last year I set up an amateur chemistry lab in the shed in our backyard. It was lots of fun, throughout the spring and summer, but when I was setting it up and buying lab equipment I had one definite question. What chemicals should I buy? I knew I could get many impure chemicals from other sources (H2SO4 from drain cleaner for example). I still wanted some chemicals of lab grade quality, and along with various other things I decided upon I also bought a small amount of KMnO4. I didn't think much of it except "This looks like an interesting oxidizer, I wonder what I could do with it?". After using a very small amount of it in an experiment, I was satisfied that I had bought it, and put it back where it belonged. At this point I saw it as a dark near black color. Then the next day, I accidentally spilled a bit of water on my lab table. On the table was a note with some experimental information on it. At first I was a bit upset that my notes had been soaks, and then I noticed those bright purple dots all over the paper. Stopping my current experiment and completely ignoring the fact that my notes were soaked, I began laying out more pieces of wet paper on the table, and noticed more and more purple spots. After some searching to find out which chemical it was that had caused this (I hadn't recalled spilling anything after all), I finally found out, and was honestly quite glad. Normally, I don't care so much about the color changes in chemical reactions (they don't interest me), but I found this purple color quite amazing. Potassium is probably my favorite element (for color, re-activity such), and I already like oxygen, so KMnO4 suddenly became on of my favorite molecules. Later, the brown spots did show up, and I sympathize with the Prof's situation on that. Its amazing how such small particles of dust can show up so well as purple and then brown. You wouldn't know you've lost some, and then the next thing you know its showing pretty obviously!

@austinbakanec4952

9 жыл бұрын

Ok bro, you were probably cooking meth or LSD, lol. Jokes

Whern the KMnO_4 was put into the solution, the purple crystals fell leaving a trail of prefectly spaced bubbles on the slow motion footage.You can clearly see their frequency, what is causing this frequency instead of a solid stream? I know that if you want to be technical, it will never be a solid stream because they are molecules but the fact that they are released in little bubble bursts at a specific rate just boggles my mind right now. So interesting, but would someone care to explain this? Maybe some theories? I'm super curious :3

I love how well labelled the MnSO4-vial is XD

where did he get everything when he was that young?

You're telling me the guy who named this element wasn't just a huge death note fan?

Zn is not transition element as its 3d is fullfilled ,yes it is d block element but not transition element

This stuff is fun to play with when you’re mixing 30 pounds at a time into dilution with water for groundwater remediation. No matter how clean and careful you try to be there will always be a purple mess or brown stain.

You should do a video on the colours of vanadium!

I thought that Scandium and Zinc weren't considered to be transition metals, only d-block elements, because they don't form ions with an incomplete d sub-shell?

isn't the transition metals excluding scandium and zinc, because they have to have incomplete d orbitals, or are there different definitions?

@ted_b

9 жыл бұрын

I thought so. A transition element is one that forms one or more ions with incomplete d-orbitals.