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Author: Subject: experiments for my brother
PHILOU Zrealone
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[*] posted on 19-2-2009 at 06:20


Quote:
Originally posted by Jor
As mentioned before on this board, nickel only dissolves in moderately concentrated nitric acid (around 40%), and not in concentrated (50-70%) and dilute acid. Acid concentration is crucial.

I only had acces to 69% HNO3 at that time and it chewed completely through the Ni coins (1.5 mm thickness), so I guess that assumtion of you is not true.

On the other hand iron is passivated by conc HNO3...

[Edited on 19-2-2009 by PHILOU Zrealone]




PH Z (PHILOU Zrealone)

"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
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mattrod9523
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[*] posted on 19-2-2009 at 10:04


This one is very dangerous but simple; sugar and sulfuric acid.


Also, sulfuric acid + saturated potassium iodide solution. Very nice one. It produces iodine.

You can also mix ffine iodine powder with aluminum (should really be done outdoors!).


Another one would be to drop a piece oof magnesium in hydrochloric acid, and position a burning splint right aboe it. BEAUTIFUL.
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hellfire23
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[*] posted on 20-2-2009 at 13:30


Quote:
Originally posted by mattrod9523
Also, sulfuric acid + saturated potassium iodide solution. Very nice one. It produces iodine.


Doesn't that produce amounts of dangerous hydrogen sulfide?

An easier route would be to dissolve the potassium iodide in water than add HCl and then hydrogen peroxide and filter out the iodine.
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not_important
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[*] posted on 20-2-2009 at 18:48


http://www.whynotchemeng.com/uk-and-ireland/teachers/top-ten...
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Alexein
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[*] posted on 21-2-2009 at 20:27


flamming jelly from vinegar, calcium carbonate, and rubbing alcohol. Not exactly Napalm but tad more interesting than just burning liquid alcohol:

http://www.youtube.com/watch?v=E356hphckDQ


Sodium acetate, (yea it's been done to death but might as well jump on the bandwagon...)

http://www.youtube.com/watch?v=jpEZWdPIg9o
http://www.youtube.com/watch?v=21IcpkxgBVY
http://www.youtube.com/watch?v=CAwxhAP9mnc
http://www.youtube.com/watch?v=MVIoqBZRVRU


Polishing silver using electrochemistry (nothing special, just the classic silver reduction by aluminum foil)

http://www.youtube.com/watch?v=vGCx9HZwYBo


Anodizing silver using electric current, sodium hydroxide and sulfur
http://www.youtube.com/watch?v=VrA7Jyw1uOs

Reacting silver with nitric acid at both cold and hot temperatures, shows the difference that temperature makes. What's also interesting to note is the aluminum metal resists concentrated nitric acid. Shows the concept of passivation.
http://www.youtube.com/watch?v=d6hPgGV_qAg
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Jimmymajesty
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[*] posted on 14-7-2009 at 08:38


I used to amaze my family with 100%HNO3 + NH3 solution, a drop of each in a large flask and you get a whoaa :) chem reactions which seems to burnt into my memory:

flask full of NH3 gas vs. water vat.
KMnO4 solution vs activated carbon.
little copper azide crystals in a self igniter spark gap its not too OTC demo though but is has the highest bang/amount haz mat used ratio.
some organic peroxide also rised interest in my cousin, you can demonstrate the difference how it behaves when ignited with open flame and when touched with red hot metal wire.
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ammonium isocyanate
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[*] posted on 16-7-2009 at 08:34


Well, thermite is always a fun one...

You could react teflon with magnesium to make make MgF2 and soot. Cool looking smokescreen is produced.

Sucrose + conc. sulfuric acid.

4Mg + SiO2 -> 2MgO + Mg2Si
Mg2Si reacts with ~20% HCl to form silane gas, which ignites spontaneously.

Iodoform reaction (methyl ketone + iodine + metal hydroxide), which produces a characteristic yellow iodoform precipitate.

Flame test for various cations.
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DJF90
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[*] posted on 16-7-2009 at 10:28


One that I wouldnt do myself, but have watched the following video of astounded me!

http://www.youtube.com/watch?v=2R5CCjfKzeY
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Vogelzang
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[*] posted on 20-7-2009 at 14:30


This looks interesting.

http://books.google.com/books?id=dQpDAAAAIAAJ&printsec=f...
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basstabone
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[*] posted on 21-7-2009 at 10:41


Quote: Originally posted by DJF90  
One that I wouldnt do myself, but have watched the following video of astounded me!

http://www.youtube.com/watch?v=2R5CCjfKzeY


Wow that is actually really cool! Although I don't know how safe it is... The mercuric thiocyanate doesn't sound so safe
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