Sunday, January 24, 2010

Top 10 science trick for parties


This video elaborated by  Prof Richard Wiseman from the University of Hertfordshire (UK) show the best science trick that you can do to in a party to entertain your friends.

Science experiment gone wrong


Faill... Science experiment gone wrong

Very very nice optical illusions!


Very very nice optical illusions!

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 couple
of times (add water, mix, wait for mercury thiocyanide to separate at the bottom, decand/remove clear water, repeat.
Put paper coffee filter into funnel and filter out the mercury thiocyanide, dry iy - must be bone dry to use it.


Safety:
Nitric acid is dangerous, handle with safety glasses, wash your hands immediately if spilled.
Vapours of mercury are dangerous - best gandle on open air.
Sodium or potassium thiocyanide is not that dangerous but don't leave solution for anyone to drink!
When dissolving the mercury in nitric acid, vapours of nitrogen oxides will form - these are poisonous if inhaled.
While decomposing, mercury thiocyanide forms fumes - don't know what they contain but make sure you burn it in open air (and NOT in your bedroom! ;-) and stand against the wind to prevent the fumes from inhaling." From: youtube description video.

Methane soap bubbles tower


Mythbusters built a Burnable tower using methane, soap and water!
Friday, January 22, 2010

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.
Thursday, January 21, 2010

Naica mine Chihuahua, Mexico


"Cueva de los Cristales (Cave of the Crystals) is a cave connected to the Naica Mine 300 metres (980 ft) deep in Chihuahua, Mexico. The main chamber contains giant selenite crystals, some of the largest natural crystals ever found.[1] The cave's largest crystal found to date is 11 m (36 ft) in length, 4 m (13 ft) in diameter and 55 tons in weight. The cave is about 27 m (89 ft) in length and 9 m (30 ft) in width. The cave is extremely hot with air temperatures reaching up to 44 °C (111 °F) with 90 to 100 percent humidity. The cave is relatively unexplored due to the extreme temperatures and high humidity.[2] Without proper protection people can only endure approximately ten minutes of exposure at a time.[3]" From wikipédia: http://en.wikipedia.org/wiki/Cave_of_the_Crystals
Wednesday, January 20, 2010

Real scale universe animation

"Explanation: What would it look like to travel across the known universe? To help humanity visualize this, the American Museum of Natural History has produced a modern movie featuring many visual highlights of such a trip. The video starts in Earth's Himalayan Mountains and then dramatically zooms out, showing the orbits of Earth's satellites, the Sun, the Solar System, the extent of humanities first radio signals, the Milky Way Galaxy, galaxies nearby, distant galaxies, and quasars. As the distant surface of the microwave background is finally reached, radiation is depicted that was emitted billions of light years away and less than one million years after the Big Bang. Frequently using the Digital Universe Atlas, every object in the video has been rendered to scale given the best scientific research in 2009, when the video was produced. The film has similarities to the famous Powers of Ten video that has been a favorite of many space enthusiasts for a generation." From: http://apod.nasa.gov/apod/ap100120.html
Tuesday, January 19, 2010

Sodium Acittate hot ice


This video shows how to make hot ice, a supper saturated solution of sodium acittate that crystallizes when you disturb it or add a small crystal.

Science Experiment - Microwave Ivory Soap


The water inside the ivory soap expands when heated in microwave oven creating a very interesting shape.

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.
Tuesday, December 15, 2009

A valley in thirty seconds



"This activity models how tensional forces can cause fractures in rocks, sometimes creating rift valleys" From description of youtube

The earth is a dynamic planet, in ours human life time we barely note that, perhaps just when a volcano erupt or a earthquake destroys a city. Analyzing geological features in rocks we found out pieces of a huge puzzle and then theories are created. To confirm those theories some lab experiments were made. This video shows a qualitative experiment that demonstrates how normal faults are formed in a rifting process.

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.

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