Name: Vanadium - Periodic Table of Videos
Uploaded: 2020-04-13T16:26:08.000Z
Duration: 6 min 3 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

the third of the so-called "transition metals,"

I don't know a huge amount about the chemistry

of vanadium. I've never actually seen vanadium metal,

There are several things that interest me:

first of all that you can make wire as thin as that,

and secondly, that it doesn't look very shiny,

possibly it's got an oxide layer on the surface.

I've been given another sample: of vanadium powder,

but vanadium powder can catch fire quite easily,

and so I don't really want to take it out

because we might have a fire here on the table

It is also like many of the transition metals,

you can have different so-called "oxidation states"

because it's what our first-year students do.

So if you come to this university, and several others,

you'll get better marks on your Practical!

Darren, my colleague, really enjoys doing this reaction.

It's a yellow solution of ammonium metavanadate.

As you can see, it's a nice yellow colour,

So what we have here is we have a metal amalgam.

The really nice thing about this amalgam is

that we can convince some electrons to jump

from this metal amalgam onto some other species.

and I'm gonna put in here a glug of vanadium five.

It's not a scientific quantity, that's... that's,

that's uh... A glug is... It's a good glug.

and hopefully, what I'm a-gonna do is by shaking it up

I'm gonna convince some of the electrons in the metal

changing the oxidation state of the vanadium.

As I do it, hopefully we'll see a colour change.

And the blue colour, I happen to know, is vanadium four.

has gained one electron, changing its oxidation state,

So if I shake it a bit more, I'm gonna see

can we convince more of the metal to give up electrons.

and you can see it's got a kind of a green colour there,

We've gone from vanadium five, to four, to three.

a lot to see can I convince another electron to go

So, let's see. And this is... 'cos mercury is so heavy!

Vanadium two, so we've gone vanadium 5, 4, 3, 2.

Four different oxidation states of vanadium,

oxygen can obviously...the air can get into the container,

this solution again. So if we waited for long enough,

[Sir Martyn] You can find vanadium in nature.

that faeries and elves sit on in faery tales

and in this mushroom, or maybe toadstool,

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Vanadium - Periodic Table of Videos

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