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Showing posts with the label Chemistry

Nitrocellulose - the gun cotton

Nitrocellulose, an explosive similar to nitroglicerin but, instead of glicerin, it has cellulosis on its composition. It is not sensitive to impact just to heat.
It burns so fast that there is no time to exchange heat with the hand

How to Play tennis using soap bubbles and a carpet racket

This video shows how to play tennis using a soap bubbles and a carpet racket. The soap bubbles are formed by a doubled layer of soap at extremities and a layer of water at center.
The polar part of soap molecules are bonded to the water and the nonpolar part are on the outer side.
Carpet is composed of polyester, as the bubble's outer side, so the interaction between them is very weak and the bubble do not pop out.

Flame test as you never seen before

Each chemical element has its own Identity given by the color emited when it is burning. The colors in fireworks is due a diferent kind of elements. Copper give the color green, sodium give the yellow one. This video shows a lot of diferent elements and its correspondent colors.

Oxydation of glycerine by potassium permanganate

Glycerine or glicerol is oxidized by a very powerfull oxidant, the potassium permanganete. This reaction liberates a lot of heat, it's called exothermic reaction.

Science experiment - how to make butter

Learn about science and you make your own butter. Science has never tasted so good.

pharaoh's snake

That is very very dangerous.... be sure of what are you doing ....
"This is a piece of mercury thiocyanide. When decomposing, it makes large volume of ash, much larger than the piece of mercury thiocyanide itself.
By popular demand, here is a recipe to prepare mercury thiocyanide:


You need:
1. concentrated nitric acid (HNO3)
2. mercury (Hg) - from chemist or from thermometers
(alternative - buy mercury nitrate)
3. sodium or potassium thiocyanide (NaSCN or KSCN)


First, dissolve mercury in nitric acid to get mercury nitrate solution.


With concentrated nitric acid your mercury nitrate will probably crystallize - add
sufficient clean water to dissolve the crystals (say, 10 times the volume of nitric acid used).
(Alternatively: dissolve crystals of mercury nitrate in water)
In separate container, dissolve some sodium/potassium thiocyanide in water.
Add thiocyanide solution to mercury nitrate solution and mix it well.
Greyish suspension of insoluble mercury thiocyanide will form - wash with water a …

Eggshel and vinegar - reaction to make a rubber egg

The eggshell has calcium carbonate in its composition. Acids as vinegar (acetic acid) reacts with calcium carbonate generating calcium acetate and carbon dioxide. After all calcium carbonate be consumed will remain just the proteins of the eggshell making a elastic shell.

Rainbow juice using a Universal indicator

Universal indicator is used to find out the approximated PH of some substance. This video shows at first a ph 14. As some acid is added the color starts to changes. In the end the beakers bottom have a different ph from the top, so the various colors appears.

Hydrongen Peroxide and KI solution - Elephant Toothpaste

Elephant Toothpaste video, will you need hydrogen peroxide 30 volumes and KI solution as a catalyst.

Chemistry Experiment - How to make a mirror

Mirrors always fascinating the human being, the possibility to look ourselves face to face is a mark in a culture of a people. That’s why these objects were so precious in ancient times and still are for some indigenous tribes.
Nowadays it is used, beside the self admiration, in cameras, telescopes and satellites.
When the man first went to the moon, they left a mirror there, so today using a laser is possible to measure the distance earth moon very accurately.
This videos shows how to make a mirror by using the glucose to reduce a silver complex. The metallic silver is deposited in the flask forming a mirror’s surface.

Learn how to do a sodium dichromate volcano

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Sodium dichromate is a orange solid. During its decomposition N2 , water and chrome oxide are liberated. The total volume increase in about 30 times. Some chrome oxide dust and the heat liberated make it really seamed with a true volcano.

Sodium Acetate Slow Crystalization

"A single seed crystal was added to the saturated sodium Acetate solution while at 30C. Omnidirectional needle-like crystals radiated outward from the seed on contact at the solution's surface."
From: youtube video description

Rainbow Juice using Sugar, KMnO4 and NaOH

Using some sugar, NaOH, and KMnO4 is easy to prepare a rainbow juice. The KMnO4 is reducing and changing the flask color.

The magic of polyurethane foam: polyol and isocyante

http://www.youtube.com/watch?v=RwJr6Iugcrkendofvid
[starttext]
This videos shows how polyurethane foam is made, you need just mix together the polyol and the isocyanete. A chemical reaction will happen and the total volume will grow up 30 times the original size.
[endtext]

Nitric Acid and a Penny

When we put a penny in a flask containing nitric acid a chemical reaction happens, liberating nitrogen dioxide as a gas.

"Warning: Do not attempt this reaction. The gases produced are dangerous and must be properly controlled and ventilated. Also, the concentrated nitric acid used can cause severe acid burns.

If you've been keeping up, you know that we already popped a small balloon, but our intention all along was to go big. After purchasing larger balloons, we did a test run... and it was still essentially a flop. In this experiment, we use a snazzy apparatus with dual layered balloons to combat the corrosive nature of the Nitrogen Dioxide gas (and it really is corrosive).

The liquid in the first flask is concentrated Nitric Acid. When we placed a number of pennies in the flask, the acid reacted with the copper and released the nitrogen dioxide. The blue color in the copper solution is due to the copper ions.

You will notice a sort of double pop, and that is due to our dou…

Homemade lava lamp using simple materials

Using simple materials is possible make a lava lamp as shown above.
The water is more dense than the vegetable oil, so it sink. When the seltzer tablet is added the gás liberated makes the water float.

Science Experiments: Magic soap bubbles

Baking soda and vinegar are very useful in science experiments, here we have another example in which this materials are used to amaze the people!
Put some vinegar in a aquarium, latter put some baking soda. The result of reaction is sodium acetate and carbon dioxide.
The CO2 is more dense than the air, so a soap bubble will float on it as a boat float on water. The buoyancy force is equal the weight of the bubble, thus we have the equilibrium and the bubble remains on interface CO2 / Air

Amazing science experiment: “nothing” put the candles out

What this video shows seems a magic trick but is pure science!
Baking soda (sodium bicarbonate) when is mixed up with vinegar (acetic acid) produces a gas called carbon dioxide. This gas fill the space around the candle flame and put it out because there is no oxygen, essential to combustion.
Some fire extinguishers use this kind of gas.

Reaction between sugar and concentrated sulfuric acid produces coal

The concentrated sulfuric acid can take the water out of the sugar molecule producing coal plus water according to reaction equation:
C12H22O11(s) → 12 C(s) + 11 H2O(aq)
That is a exothermic process and liberates poison's vapors, then take care and use one appropriated place , don’t do it indoors!