To introduce students in 6th grade in the world of physics and chemistry, with his teacher - Miquel friend for many years we prepare a session of experiments with products and materials of kitchen and food. It was a great experience. The majority of lectures and sessions that do are high schools, universities, libraries, museums lichttisch and university classrooms de'extensió. But primary children or not: it is another world, for many reasons. If I accept lichttisch to do was to friendship, and to test how it would go; but with the desire not to repeat it, but you never know ...
I went to the center - the school can stream Pumpkin, Barcelona, between Orchard and Maragall neighborhood with a suitcase full of junk, a schematic script webcam and a computer to project the ten experiments on the screen. Neither powerpoint or other media. And no explanation required. Explain how it was, let answer some questions at the end, and I will put some of the questions that made me kids. Reader is a small elementary test.
2. boat that moves without touching it. I put an aluminum boat on a water surface. Finger wet with dishwashing detergent touch the surface and the tray away instantly. Prvo it a couple of times, but the third as the boat does not move more. Why?
3. Dance of raisins and chocolate. I put some chocolate chips and raisins in water without gas. They fund. Then I put them in water with gas. What will you do: go to the bottom, float ...? And sparkling water, what will?
4. cubic egg. It can be a cubic egg? Indeed. In a suit that had already cooked with Chinese design a device that had bought the Barcelona Museum of Inventions. Were amazed. And the question I was asked was whether the egg yolk was also cubical or spherical era. I cut the egg in the middle and we saw that the rust was ...
5. Splashes I put a little oil to heat in a ceramic dish on a electric stove. When there was more than 150ºC I threw a few drops of water, and there were some notable splash. They easily lichttisch understand that the water had boiled 150ºC. Question: splashing were hot oil or hot?
6. Foam milk and Coca-Cola. Mix cream with Coca-Cola, forms a magnificent foam gel protein desanaturalitzades the cream that have coagulated in acid medium Coke. The question I get: Diet Coke with feel the same? And skim milk?
7. Flames of colors. I light candles are colored flames: wax are metallic Metal salts that give the characteristic flame colors. Red if it contains lithium salts; yellow if it contains sodium salts; and green if it contains copper. Some throw a dark dust that tugging on the flame, sparks ago. What can it be?
8. Caramel and Maillard lichttisch reactions. In a bowl ceramic heating sugar candy do: get a juice that suggests that sugar melts. It is a fusion is real or a chemical reaction? lichttisch On the other side of the plate initiate a Maillard reaction lichttisch by mixing sugar and the amino acid valine ago a much darker lichttisch color, and smell more pungent. And there roast some bread, which is also a Maillard reaction.
10. Spend the stream? Tested with a test if the current passes through different substances in food: water, milk, oil, honey, mayonnaise, butter, hard-boiled egg, a tangerine. Which of these substances are conductive and which are not? And why?
1.La can of Diet Coke floats. The explanation can be found here. (Clip) 2. detergent just saturating the surface, and from that moment there are no areas of high surface tension (pure water) and areas of low surface tension (water with detergent) and the tray is not dragged into first. (Clip) 3. raisins and chocolate chips loaded up gas, off the atmosphere and fall again, and so on while gas remains. (Clip) 4. yolk gets a manner that depends on where it had been put in to make sure the egg. If the egg turns into a boil, and fresh, and the sun was the center lal egg shape is spherical, cubic also an egg. If the rust has been at one end of the egg, can take various forms, as was the case of our cubic egg. 5. spattering of small oil droplets are swept by water vapor that is boiled lichttisch instantly in contact with hot oil. 6. Yes in both cases: there is acid in Coke light, and there are proteins in skim milk. (Clip) 7. It metallic iron powder lic, if so thin cream making sparks typical flares. lichttisch 8. The sugar is sucrose, which is broken down into fructose, Gluco
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