African Gold Laboratory - Periodic Table of Videos

[Oz6102]

Gold Chloride

[krismagician]

and because of it's rarity.

[ikelace1]

and because its rarity and beauty,

[ZhalfirinCrusader]

When he refers to storing gold and it never changing, its not totally in reference to the value, its about the physical form. Gold submerged or exposed to water forms a slight crust that can be polished out, this crust also protects the rest of the gold from oxidization. Silver on the other hand corrodes strait through and must be rerefined. This makes gold preferable for long term wealth storage, not just because of it value but because of its resistance to corrosion.

[Doogeedoo12]

Very nifty video. Haha, he said all your money can be put away and it will never change. That's of course not taking stock markets and globalization into account, haha.

[DrBones666]

No, the value of gold stays the same. It's money that's variable Do a bit of research, you'll see.

[TheAksumite]

Money is just an illusion!

[Sunderas]

He's referring to storing your money under the form of gold.

[UncleCliff]

you know the price of gold fluctuates, right

[quill18]

Really excellent video! It stands out from the others as it seems less technical but more "alive". Nice to see variation in tone.

[chimpstop]

Gold! Precious Goooooooooooolllllllllllllllll­lllllllllllld! There's Gold 'n Afrik'uh!

[joouyang]

Another new lesson for me thkq!!

[Jiraya12345]

Wouldn't it just be easier to boil the water out of the aqua regia solution and then put the precipitate in another acid? (So that all the other metals dissolve, leaving the gold intact)

[philsaspiezone]

I tend to prefer synthetic chemistry especially organic but inorganic is very interesting though

[AlmightScoop]

Quite. Due to the nature of the periodic table, the videos are highly oriented towards inorganic chemistry. Perhaps, now that the elements are done, they could diversify. Perhaps they could get Prof. Anderson from the organic department, or Prof. Sarre to talk about astrophysical chemistry.

[CoolMinty]

I''m curious to know how these samples are analysed? AA Spectroscopy, titration, a combination ofmethods or are there new methodologies for this? ;)

[Odjii]

really interesting, more from this laboratory in the future. I love geochemistry.

[slateflash]

I thought they leech it into cyanide or thiocyanate complexes rather than chloride?

[lvecsey]

concepts of money can change though ;)

[s95ju]

that was cool

[FractalThoughts64]

What is the transition metal complex? Probably of Octahedral geometry my semi-drunken Chemistry tells me

[humanentropy]

jahn-teller effect

[rlewis1946]

Fascinating! I've always wondered how gold is assayed. Very informative. Keep up the good work.

RL

[colinstu]

Are you happy?

I'm always happy hehehe

[intermission101]

Aqua regia is a fantastic liquid. Made by nitric acid and hydrochloric acid, it dissolves even noble metals like gold.

Cool video!

[Chaosblade777]

I suppose you do need a very powerful acidic solution to dissolve gold.

[jacoman1234567]

Great video again, if I'm not mistaken they're analysing it with an Atomic Absorption Spectrometer, at least I thought i saw one over there.

[DrAllan1]

That it was, a very old version of the instrument though (will still do the job of course).

[matthew623210]

You guys should so get a Nobel Prize for these videos!

[ttwilightzzone]

Perhaps a Noble Prize would suffice?

[bibabuwhatever]

nice.

but that subtitle stuff wasnt necessary imo.

[CoolMinty]

Beautiful and interesting. Thank you, bothered and happy ;)

[Gichnni]

I got a question about Gold; why can't you create gold in a chemical way?

[leekymkween]

there probably is a way but it would be inefficient... it would probably cost more money and energy than to produce the stuff

[revorocks123]

because its an element...

[redone632]

@revorocks123

Helium is an element, yet it is created everyday by the Sun from hydrogen and fusion.

[sciencoking]

As gold is an element it consists of only one kind of atoms. You can´t make gold out of aluminium atoms :P

And actually you CAN make gold out of gold compounds. This is even quite easy. BUT the compound has to contain gold atoms, and in most cases you need pure gold to make them because they do not occur naturally.

[cyberdemon107]

Same reason it's difficult to turn hydrogen into helium. Atomic nuclei are simply difficult to manipulate.

Also, chemical reactions occur in the electron cloud, while nuclear reactions (such as radioactive decay and fission of uranium) occur in the nucleous of the atom. And the nucleous is to the cloud about what a marble is to an olympic stadium.

Go wiki it, you will understand better.

[Gichnni]

Ok, thanks for the answer!

[PaulusTheMisionary]

Do you have to have high mathematical skills to consider a career in chemistry?

[DeathlyCrunch]

You need to be pretty good with it but it's not the core of the filed like Physics.

Physic>Chemistry>Biology, in terms of maths. With the latter requiring next to none.

[xbmarx]

At my university you need to get through multivariable calculus to earn a chemistry degree. So only like three or four math classes if you start from 1st year calculus.

Of course, there's specialized topics that require a LOT more math. I'm a math major and I'm currently doing research for my degree in evolutionary game theory, and that's pretty math-intensive. So even bio can require a lot of math, it just depends on what you do.

[LaughingManRa]

My school only required two semesters of calculus. However, many chemists find courses in differential equations, linear algebra and multivariable calculus to be useful, particularly if you're interested in physical chemistry. It really depends on your interests--if you like synthetic chemistry, you don't need that much math, but if you're into theoretical chemistry then you should consider at least a math minor or the equivalent.

[Kyleidge]

:D.

[NBCDateline]

Sweet, you went to ethiopia, i wanna go too :D

[periodicvideos]

@NBCDateline: Check out Ethiopia playlist... A whole selecion of films from our trip there!

[NBCDateline]

Thanks, i'll check it out ^,^

[cyberdemon107]

nice, keep it up

btw would you recommend visiting Ethiopia? Did you go, or are you simply managing the youtube acct?

[NBCDateline]

Awesome =O

[Gichnni]

I always wanted to go there!

[Gichnni]

Cool!

[gaussman08]

wow i'm the 1st comment :B