This experiment takes advantage of density to create a rainbow in a glass. When you add sugar to a liquid, it causes the solution to become more dense. The more sugar you add, the more dense the solution is.
If you have four different solutions that are all different colors and densities, the colors will layer on top of each other — the denser, more sugary solutions will sit on the bottom and the lightest will sit on the top.
When you mix glue, water, and a little bit of food coloring, then add some borax, a gooey slime forms. That's because the glue has something called polyvinyl acetate in it, which is a liquid polymer. The borax links the polyvinyl acetate molecules to each other, creating one large, flexible polymer: slime.
Believe it or not, you can create a very simple hybrid rocket engine using nothing but some yeast, hydrogen peroxide, a jar, fire and ... a piece of uncooked pasta.
When you mix the yeast and hydrogen peroxide together, they react and create pure oxygen gas. When this gas is funneled through a piece of pasta, all you need is a little bit of fire and you've got yourself a pasta rocket.
Alka-seltzer is great if you're suffering from heartburn or an upset stomach. But you probably didn't know that it's also great if you're looking to create your own homemade lava lamp.
Because oil and water have different densities and polarities, when you mix them together, the water sinks to the bottom. When you add food coloring, which is water based, it will sink to the bottom as well.
If you crumble in an alka-seltzer tablet, it reacts with the water, causing colored droplets of water to rise to the top where they then pop, release air, and sink back to the bottom.
This creates a similar show to what you'd see in a lava lamp.
In order for water to become ice, it needs a nucleus in order for solid crystals to form. Usually, water is loaded with particles and impurities that enables ice to form. But purified water isn't. Because of this, purified water can reach an even colder temperature before becoming solid.
If you throw an unopened bottle of purified water into the freezer for a little less than three hours, the bottle will be chilled well below the temperature at which regular water freezes.
When you pour this super-cooled water onto a piece of ice, it provides the water with nuclei, causing it to freeze instantly.