Experiments – the best learning science “Space – sky above us”

Trip to Planetarium

Еxperiments : “space - sky above us “ , pROBated with children from kindergarten “Zvanche”,their teachers and parents

DAY AND NIGHT You need of globe and flashlight

SPINNING TOP You need of different types spinning tops for children

ERUPTING VOLCANO You need : tin metal can, paper bag, tape, vinegar, baking soda, red dye, a newspaper

IS IT MAGIC Necessary materials: magnet, iron fillings, cardboard trays

MAGIC PEN Materials needed : ballpoint pen ,woolen cloth , pieces of tissue paper

Lava in a bottle You will need A clean 1 liter clear soda bottle 3/4 cup of water Vegetable Oil Fizzing tablets (such as Alka Seltzer) Food coloring What to do - Pour the water into the bottle. -Use a measuring cup or funnel to slowly pour the vegetable oil into the bottle until it’s almost full. You may have to wait a few minutes for the oil and water separate. -Add 10 drops of food coloring to the bottle (we like red, but any color will look great.) The drops will pass through the oil and then mix with the water below. -Break a seltzer tablet in half and drop the half tablet into the bottle. Watch it sink to the bottom and let the blobby greatness begin! -To keep the effect going, just add another tablet piece. For a true lava lamp effect, shine a flashlight through the bottom of the bottle.

  Does the temperature of the water affect the reaction? Does the size of the bottle affect how many blobs are produced? Does the effect still work if the cap is put on the bottle?

How does it work? To begin, the oil stays above the water because the oil is lighter than the water or, more specifically, less dense than water. The oil and water do not mix because of something called “intermolecular polarity.” That term is fun to bring up in dinner conversation. Molecular polarity basically means that water molecules are attracted to other water molecules. They get along fine, and can loosely bond together (drops.) This is similar to magnets that are attracted to each other. Oil molecules are attracted to other oil molecules, they get along fine as well. But the structures of the two molecules do not allow them to bond together. Of course, there’s a lot more fancy scientific language to describe density and molecular polarity, but maybe now you’ll at least look at that vinegrette salad dessing in a whole new way.   When you added the tablet piece, it sank to the bottom and started dissolving and creating a gas. As the gas bubbles rose, they took some of the colored water with them. When the blob of water reached the top, the gas escaped and down went the water.

MAKE A BALLOON ROCKET You will need: 1 balloon (round ones will work, but the longer “airship” balloons work best) 1 long piece of kite string (about 10-15 feet long) 1 plastic straw tape What to do? Tie one end of the string to a chair, door knob, or other support. Put the other end of the string through the straw. Pull the string tight and tie it to another support in the room. Blow up the balloon (but don’t tie it.) Pinch the end of the balloon and tape the balloon to the straw as shown above. You’re ready for launch. Let go and watch the rocket fly!

Answer to these questions: How does it work? So how does it work? It’s all about the air…and thrust. As the air rushes out of the balloon, it creates a forward motion called THRUST. Thrust is a pushing force created by energy. In the balloon experiment, our thrust comes from the energy of the balloon forcing the air out. Different sizes and shapes of balloon will create more or less thrust. In a real rocket, thrust is created by the force of burning rocket fuel as it blasts from the rockets engine – as the engines blast down, the rocket goes up! Answer to these questions: 1. Does the shape of the balloon affect how far (or fast) the rocket travels? 2. Does the length of the straw affect how far (or fast) the rocket travels? 3. Does the type of string affect how far (or fast) the rocket travels? (try fishing line, nylon string, cotton string, etc.) 4. Does the angle of the string affect how far (or fast) the rocket travels?

Thank you