Science can be very interesting and fun ifthis is not just a formula in the textbook. Do you know what the schoolchildren lack in chemistry and physics lessons? Practice. Not all teachers entice students with experiences and not all tell how all these complex laws and formulas are related to life. But if you see how these laws work, they cease to be so complex. If your child still does not understand, why teach physics and who needs chemistry, do our experiments together. Let everything boil over you, hiss, disappears and flies away!
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Effervescent Rocket
What you need: effervescent tablets, plastic box with a tight lid, water. Let's experience: fill the box in half with water. Put the tablet in there and quickly close the lid. Put the box lid on the table. Wait. BOOM!!! The lid opens, the jar flies away. Scientific explanation: when water and an effervescent tablet come together, a reaction occurs between sodium bicarbonate and citric acid. It turns out carbon dioxide - bubbles. There are so many of them that an overpressure occurs in the box, which breaks the lid and launches the “rocket”. Gas, escaping from the hole, pushes the box in the opposite direction.
Ice water
What you need: plastic (not glass!a bottle of sparkling water and freezer. Stake experience: put the bottle in the freezer. 500 ml - about 2 hours. Remove the bottle from the freezer. Open and see how soda will freeze right in your hands. Scientific explanation: carbonated water freezes at -8, that is, at a lower temperature than ordinary water. This is because soda contains carbon dioxide and some salt. The moment you open the bottle, the gas comes out of the water, and the freezing point rises sharply. Therefore, ice is forming on the bottle right before your eyes.
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Light curve
What you need: empty plastic bottle, needle, lantern, sink. Let's experience: fill the bottle with water and close the lid. Make a hole in the wall of the bottle with a needle. Place the bottle on the sink so that the liquid through the hole slowly poured down into the sink. Turn off the light, take the flashlight and shine through the bottle, directing the beam towards the hole you have made. The light refracts and goes after the water, to the bottom of the sink. Scientific explanation: light travels along the shortest path, that is, in a straight line. In this trick, he passes through the water, at the border of liquid and air is reflected and comes back. It creates the effect of "curvature" of the light beam.
Hot paint
What you need: two identical glasses or jars, very thick cardboard or plastic to close the opening of the jar, two different food colors, cold and hot water. Let's experience: pour cold water into one glass and hot water in the other, but not boiling water. Add a few drops of different dyes, for example, in hot water - red, in cold - blue. Put a “lid” (cardboard or plastic) on a glass of hot water. While holding the lid firmly, gently turn it over and place a hot glass in a glass with cold water. Gently pull the cap out. Do you know what will happen? Nothing. The fluids will not mix. Now repeat the same steps, only this time there will be a glass with cold water on top. And you know what? Fluids will mix! Scientific explanation: a liquid with a lower density rises above a liquid with a higher density. That's because hot water has a lower density than cold water. Indeed, at high temperatures, molecules in the water move faster, creating more space between each other.
Fire extinguisher in jug
What you need: several candles, matches, 1 teaspoon of soda, 150 ml of vinegar, a large jug. Let's experience: put a number of candles in stands next to stands; it is necessary that they stand firmly. Pour vinegar into the jug and add soda. Wait for the hiss to stop. Light the candles. Now slightly tilt the jug over each candle, but so that the liquid does not overflow. Candles will begin to fade. Scientific explanation: soda in a jug interacts with acid (vinegar), and carbon dioxide is produced. He begins to accelerate oxygen around the candles, which is necessary for burning. Carbon dioxide is heavier than air, therefore, by tilting the jug, we can put out the candles. This is how carbon dioxide extinguishers act. Only such (without water) can extinguish the fire where there is electrical equipment.
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Egg in a bottle
What you need: glass milk bottle, hard-boiled egg, strip of paper, matches. Let's experience: peel the egg from the shell, light the paper and throw it into the bottle. Place an egg on top of the neck. When the piece of paper burns out, wait a couple of minutes. The egg will fall inward. Scientific explanation: at the beginning of the experiment, the atmospheric pressure in the bottle is the same as outside. When the paper lights up, the air in the bottle heats up, its pressure increases, and it gradually seeps between the egg and the neck of the bottle. When the fire is extinguished, the air is cooled. But the egg, closing the neck, does not allow outside air to get inside the bottle and equalize the pressure. Finally, the pressure from the outside becomes so much stronger than the inside that the egg is drawn into the bottle.
Multicolored Milk
What you need: food dyes, full-fat milk, dishwashing liquid, bowl. Let's experience: pour milk into the bowl on the thickness of your finger. Drip 4 drops of each liquid dye evenly over the entire surface of the milk. Add a few drops of dish detergent directly to the center. Paints will begin to mix by themselves. Scientific explanation: detergents allow the fat to mix with water. With the help of dishwashing liquid, we mixed water and fat in milk, and as a result, curls and whirlwinds were formed, which is why the color mixing took place. You can find more experiences, simple explanations and interesting stories in the “It's cool!” Series of books. ":" Science is cool! "," Physics is cool! "," Nature is cool! "," Cosmos is cool! "," Programming is cool! "," Art is cool! ". Read on:
