Gallium Induced Structural Failure of an Aluminum Sheet
In this video we cause an aluminum sheet to fail structurally using gallium metal.
For this experiment a 1mm thick aluminum sheet was used.
Simply score/scratch the surface and apply molten gallium. The sheet must be kept warm while the gallium diffuses in so it should be kept in a warm room. Otherwise the gallium will freeze and the diffusion stops.
What's happening is the gallium is dissolving some of the aluminum as well as diffusing between the grain boundaries of the aluminum microcrystals and disrupting their bonding. This causes the aluminum sheet to greatly weaken so it can easily be destroyed just by punching it. ... https://www.youtube.com/watch?v=IZkzxWZETds
In this video we explore a bit of chemistry of the catalyst and verify that primary alcohols can't work and that some sort of catalyst i necessary.
Tea tree oil is found to have lackluster but still promising potential as a catalyst.
Related Videos:
Using grignards to make tertiary alcohols: https://www.youtube.com/watch?v=EFQWD7-DCPI
Using 7-hexyl-7-tridecanol to test if sodium production was even possible: https://www.youtube.com/watch?v=D4vDwQ4TyIc
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https://www.youtube.com/watch?v=cbvC3dFjsx0
In this video we make triboluminescent or smash-glow crystals.
Triboluminescence is the phenomena where light is generated when something is rubbed or fractured. The exact mechanism by which triboluminescence works is still under investigation, but the best theories so far propose that the breaking of the structure causes charge separation that release energy upon recombination. This energy is picked up by nearby atoms, in this case europium, and released as light according to their ionization or fluorescence spectra.
Many substances exhibit triboluminescence including sugar and tape. But Europium Tetrakis (Dibenzoylmethide)Triethylammonium is one of the strongest available and its glow can easily be captured by a camera.
It's made by mixing 100mL of Ethanol, 2.93g of dibenzoylmethane, 1.4g of europium nitrate pentahydrate and 1.9mL of triethylamine. The mixture is heated until everything dissolves and then allowed to cool slowly to obtain crystals that are filtered off and washed with ethanol. After thorough drying they are ready for use.
A frequently asked question is if this stuff is hot when it is used. The answer is no, the crystals do not undergo a chemical transformation and thus they do not release or consume heat, but remain at constant temperature. There may be some small heating due to friction when they are broken, but that is not from the crystals or a special property of triboluminescence.
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https://www.youtube.com/watch?v=xQhLSoB-uBE
In this video we explore whether ruthenium jewelry is safe by seeing how it reacts with the common household chemical bleach.
It's well known that ruthenium is a highly resilient metal capable of withstanding chemical attack by very corrosive acids like nitric acid, hydrochloric acid, sulfuric acid, aqua regia, etc. So it would be make sense to fashion jewelry out of such a resistant substance. But ruthenium is highly susceptible to attack by sodium hypochlorite. To test this we immerse a ruthenium plated ring into household bleach. Unfortunately the ruthenium plating very clearly dissolves off within minutes, producing sodium ruthenate and peruthenate salts as well as bubbles of ruthenium tetroxide gas.
Since these substances are highly toxic. And bleach is a commonly encountered substance in everyday life, it is recommended to discontinue use of ruthenium for jewelry.
Related videos:
Chemical resistance of Ruthenium: https://youtu.be/H7Ng4sOVkns
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https://www.youtube.com/watch?v=9E3D9BsQMx8
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In this video we make chloroform by the haloform reaction of sodium hypochlorite bleach on methyl ethyl ketone.
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https://www.youtube.com/watch?v=MvkuqLxQd2c
In this video we’ll show how to make an AA battery.
Warning: Potassium hydroxide is corrosive, zinc is a heavy metal, and manganese dioxide is an irritant. Wear gloves when handling them.
Get a 5 mL plastic syringe (the one i got was from a company called “BD” and the catalogue number was 309603). Discard the plunger and cut off the tip. Also cut the back up to the 5 mL mark.
Get a 5 by 3 cm sheet of zinc metal about 0.5 mm thick. Cut into the 3 cm side a series of cuts about half a centimetre long. Roll the sheet so it fits into the syringe tube. Don’t roll it too tight so it falls out. It should be big enough that it stays in by friction.
Once you have the right diameter, pull it out and bend inward the tabs we cut earlier.This should now form a zinc can.
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https://www.youtube.com/watch?v=3Ts34IWziqo
In this video we show how to isolate zinc metal by electrochemistry.
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I go back to sticking my hand into liquid nitrogen but remain uninjured due to the Leidenfrost effect.
The Leidenfrost effect is the formation of a gas barrier between a hot surface and a boiling liquid if the temperature difference is great enough. This gas barrier greatly slows the heat transfer between the two and allows the liquid to last longer and consequently the hot surface to remain hot longer. This effect can be seen in a frying pan as it's being heated. At first the water quickly boils as it's dropped in but at a hot enough temperature the Leidenfrost effect takes over and makes the water skate around the surface lasting a very long time.
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https://www.youtube.com/watch?v=wV7g8L633Sg