demos many chemistry ones

7/27/2019 DEMOs Many Chemistry Ones

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Many Chemistry Demo’s

Coin-Operated Red, White, and Blue Fountain: Reaction of Nitric cid and Copper

Description: Nitric acid plus copper gives nitric oxide in an exothermic reaction. The expanding gasdisplaces water from another flask; when the gas cools, the water is drawn back into the flask, dissolvingthe nitric oxide and forming a blue solution with the copper ions still there.

!ource: B.Z. Shakhashiri hemical !emonstrations" # $andbook for Teachers of hemistr%

"ey#ords: oin&operated !emonstration, Nitric #cid, opper, 'ube (oldberg !emonstration

$lephant%s &oothpaste

Description: Three solutions are mixed together and copious foam is produced along with a color change

to %ellow. This is primaril% an attention&getter.

"ey#ords: h%drogen peroxide, potassium iodide, detergent, !awn



Nitric cid cts on Copper

Description: The reaction between concentrated nitric acid and copper pennies produces red&brownnitrogen dioxide and dissolves the copper to form a blue solution. The gas ma% be led into a large container

of water to show that it turns the water acidic.

This demonstration is also available on video and )* +hemistr% omes #live+ vol. - !&'om.

Reaction of 'inc and (odine

Description: The addition of a few m of water to a mixture of elemental /inc and iodine results in

evolution of purple vapor and heat.

This demonstration is also available on video and )* +hemistr% omes #live+ 0ol. 1 !&'om.

Ratin):

!ource: B. Z. Shakhashiri, hemical !emonstrations" # $andbook for Teachers of hemistr%

*ear or +ol: 1 pa)e: 23

"ey#ords: Zinc, *xothermic, 4odine, Thermochemistr%

http://jchemed.chem.wisc.edu/JCESoft/Programs/Video_CD.html






!pontaneous Redo reactions

Description: 5ne of man% examples is when /inc metal is placed in a solution of copper sulfate, the copper

is reduced and appears as a black coating on the /inc.

sin) lar)e )lass cylinders to demonstrate precipitation reactions

Description: # precipitate is formed from two soluble salts in a large glass c%linder that is almost

completel% filled with one of the salt solutions. The other salt is dissolved in a funnel at the top of the

c%linder. 6hen the solutions meet at the funnel stem, a precipitate forms. This process can continue for

almost an hour

!il+er &rees



Description: # copper sheet in the shape of a hristmas tree is placed in a solution of silver nitrate. Thesilver is spontaneousl% reduced on the copper to form silver cr%stals.

Oidation !tates of .anadium

Description: 7ellow vanadium 8049 is swirled with )ones 'eductor and will progressivel% change coloruntil it reaches the violet vanadium 8449. #lternativel%,violet vanadium8449 is oxidi/ed through a series of

colors b% permanganate to a final %ellow color.

Oidation of !odium

Description: # small piece of sodium is placed in water containing phenolphthalein. # pink trail ensues asthe sodium moves over the water surface.

This demonstration is also available on video and )* Software +hemistr% omes #live+ !&'om.




demos many chemistry ones

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