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Silver egg Experiment

When we burn something, a chemical reaction is caused between the burning material and oxygen in the air. What we end up with is carbon as a solid product. When we burn the eggshell from every side and make it totally pitch black, a thin coat of carbon covers the whole surface of the eggshell. That’s why the egg becomes black because carbon is black.   In the carbon coating, some air is stuck. And won’t get wet. When the egg is submerged into the water, light rays hit it through the water. When the light rays reflect back from…

Screaming Balloon experiment

Why does the hex nut make a sound? The answer is simple science. The hex nuts circle the inside of the balloon due to centripetal force. Centripetal force is the force that causes the hex nuts to move in a circular pattern.   The hex nut has 6 flat sides. The flat edges of the hex nut allow it to vibrate or bounce along the inside wall of the balloon. The screaming sound is created by the sides of the hex nut bouncing or vibrating along the sides of the balloon.  

Floating M with M&M candy Experiment

The floating m doesn’t happen immediately, but the color dissolving off of the M&M happened almost immediately. The materials used to color the M&M start to dissolve quickly and you begin to see the colored dyes from the M&Ms dissolve and make rainbow colored water!   The chocolate on the other hand did not dissolve quickly, but we wanted to see the floating m!   It took about 10 minutes for the first M and about another 5 or 10 minutes for all the M’s to float. Using warmer water will make the M float faster.   And there it…

Bed of nails with Balloon Experiment

Nails are sharp because they have a point with very little surface area. One nail point has a lot less surface area than, say, five or ten nail points like a balloon might encounter on a bed of nails. To pop a balloon, a nail has to exert a lot of pressure on the balloon. Pressure = force / area, so the smaller the area, the more pressure is exerted by the same amount of force. On a bed of nails, the force is distributed over those 68 nail points (remember, more surface area), so the pressure is less and…

Baby Diaper Secret Experiment

The secret, water-absorbing chemical in a diaper is a superabsorbent polymer called sodium polyacrylate. A polymer is simply a long chain of repeating molecules. If the prefix “poly” means many, then a polymer is a long chain of molecules made up of many smaller units, called monomers, which are joined together. Some polymers are made up of millions of monomers.   Superabsorbent polymers expand tremendously when they come in contact with water because water is drawn into and held by the molecules of the polymer. They act like giant sponges. Some can soak up as much as 800 times their…

Kinetic Sand experiment

Kinetic Sand, a sand play toy made from 98% sand, and 2% Polydimethylsiloxane, a “silicon-based organic polymer…particularly known for its unusual rheological (or flow) properties.” It makes the sand act weird.   It hold shapes great and kids love building objects with it, but when touched it seems to become sand in motion. Kids love this stuff.  

Wave Machine Demonstration Experiment

To make a awesome wave machine, you only need 3 things: gummy bears (candy), duct tape, and skewers. It took me about 15 minutes to make.   When lifting the gummy bear up and releasing it causes a disturbance that sends energy from one end to the other end and back. Depending high you raise the gummy bear is how big the disturbance will be, but not matter how high you raise the gummy bear it will always go the same speed back and forward. If you want to change the speed take off half of the gummy bears and…

Reflection of Light – Disappearing Coin Trick and the Science behind it.

When there is no water in the cup, the light from the penny experiences very little refraction and we can see the light from the penny.   When there is water in the cup, the light from the penny experiences refraction (bending) and reflection (total internal reflection, TIR) such the light it is not able to reach the observer’s eyes. A small amount of refraction occurs as the light leaves the penny and travels through the bottom of the cup, then refraction occurs again as it enters the water. When refraction occurs at the side of the cup there is…

CLEAN A PENNY WITH VINEGAR

Why did the pennies look dirty before I put them in the vinegar? Copper atoms can combine with oxygen atoms to make a molecule called copper oxide. The pennies looked dull and dirty because they were covered with copper oxide.   Why did the vinegar and salt clean the pennies? Copper oxide dissolves in table salt-and vinegar because of its weak acid.   Why did the unrinsed pennies turn blue-green? When the vinegar and salt dissolve the copper-oxide layer, which makes it easier for the copper atoms to join oxygen and chlorine from the salt to make a blue-green compound…

Egg drop with toilet paper experiment

Fill water glass about 3/4 way full, place pie tin on top of water glass, place paper tube on top of pie tin and directly over the whole of the water glass. then hit the pie tin from the side very quickly.   Why does the egg fall right into the glass? This was answered by Sir Isaac Newton’s First Law of Motion, which states that an object at rest remains at rest and an object in motion stays in motion with the same velocity unless acted upon by an unbalanced force.   Because the egg is not moving at…

The Shaken-Soda Cans experiment

Two identical soda cans released at the same time on an incline will roll down at the same rate. However, if one of the cans is shaken, it will lose the race. Experimental evidence is presented that points to the presence of bubbles as the cause of the greater energy transfer to the fluid in the case of the shaken can.   The moment of inertia of the two cans is different.   When you shake one can, the gas inside the liquid tries to escape. It creates a foam that cannot escape and covers most of the unused volume…

How to swing a glass of water in a circle experiment

It seems as if the water in the glass is defying gravity, but is it really? No. Gravity – the force pulling down on everything – is still at work even when the glass and water are above your head. The water’s inertia wants to keep the water traveling in a straight path, but gravity is acting on the water, causing it to fall in a downward path that will eventually hit the earth.   However, while the water is falling, the glass is falling with it, catching the water. What keeps the glass and water moving in a nice…

Ivory Soap Experiment

Ivory’s first slogan, “It Floats!”, was introduced in 1891.   Ivory bar soap is whipped with air in its production and floats in water. Other brands of soap do not have as much air in it and will not have the same result. We did not test any other brands in the microwave.   When Ivory soap is heated in a microwave it gets hot and causes the soap to get soft. The microwaves beaming in the oven excite the water and air molecules inside the soap cause them to move in opposite directions from each other and vaporize. The…

Coin launcher Experiment

When you cool air it shrinks, extra air is pushed into the bottle.   Then the wet coin seals the top of the bottle as it freezes. So as the temperature increases the pressure builds up.   This means that when you heat up the air again with your hands, it pushes outwards harder and harder until the pressure on the bottom of the coin is large enough to break the ice around it. As the ice breaks the coin is pushed upwards and flies away from the bottle.  

Ping Pong Ball BLAST OFF! Experiment

When I released the cup, the ball and water all fall together at the same speed, which increases as they continue to fall due to the force of gravity. The cup hits the ground first, then the water slams into the bottom of the cup. As water molecules pile up they collide with each other and create a compression wave that travels upwards very fast, like instantly. The water has much, much more mass than the ping pong ball, so when the upward moving wave collides with the downward moving ball a tremendous amount of energy and momentum is transferred…

Touch and See Squares Experiment

Liquid crystals represent a phase in between liquid and solid. The molecules in a liquid crystal can move independently, as in a liquid, but remain somewhat organized, as in a crystal (solid).   These liquid crystals respond to changes in temperature by changing color. As the temperature increases, their color changes from red to orange, yellow, green, blue   What’s going on? The liquid crystal sheet is temperature sensitive, and an detect where your hand warmed the sheet.   Blue is the warmest, then green, orange and red. Black is the room temperature.   Blue – (82o – 86oF) Green…

A Magnet Linear Accelerator Experiment

When the Magnet Linear Accelerator shoots, it will happen too fast to see. The ball on the right will shoot away from the gun, and hit the target with considerable force. Our one foot long version is designed so the speed is not enough to hurt someone, and you can use your hand or foot as a target.   How does it work? When you release the first ball, it is attracted to the first magnet. It hits the magnet with a respectable amount of force, and a kinetic energy.   The kinetic energy of the ball is transferred to…

Floating Rice with Friction Experiment

Start off with a one question SURPRISE QUIZ. Its yes no answer and self grading. You can do it.   Can I lift a bottle full of rice by putting a chop stick in the bottle of rice?   Well lets see.   Don’t underestimate the Power of Friction. This is something that happens everyday, but we don’t notice it.   What’s Going On? When the rice is inside the bottle, there are grains next to one another, but there is a little bit of space — an air pocket — in between each grain and its neighbor. Which allows…

Dancing Ping Pong Ball experiment

Why does this happen? Glass has a natural frequency where it vibrates. When you rub your damp finger on the outside of the glass your finger sticks to the glass because of friction and then slips because of the water which forms a cushion that reduces friction. When this slip and stick happens in equal intervals it causes the glass to vibrate.   The vibration from the glass pushes the air molecules around the glass in equal intervals, causing compression waves to form and ultimately make the sound we hear. The ping pong ball dances because it gets pushed by…

The Spinning Ball experiment

Place the jar over the ball so that the ball is inside the mouth of the canning jar. Then start spinning the glass around in a circular motion. Once the ball starts spinning inside the glass lift it from the table top. The ball is lifted from the table and will continue to spin inside the glass until it loses is speed.   As a ball velocity increases inside the glass, the centripetal force increases. That force is what’s keeping the ball stuck to the walls of the glass.   As the ball goes faster, the resulting friction begins to…

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