Make your own slime with water, glue and liquid starch to see how polymers behave. Pour 1/4-cup of white craft glue into a bowl. Next pour 1/4-cup of water into the bowl with the glue and stir them together. Add food coloring of your choice to color the slime. Add 1/4-cup of liquid starch to the mixture and stir. The mixture will become more stretchy the more you play with it. To make this demonstration more like an experiment, change the amounts of glue or starch to see how the mixture will turn out differently. Store your slime in a sealed plastic bag when you are not using it.
This experiment demonstrates a chemical reaction between baking soda and vinegar. Find a spot outside or a place that is easy to clean up. Place 1/4-cup of warm water inside a plastic zipper bag. Add 1/2-cup of vinegar to the bag. Wrap 3 teaspoons of baking soda in a tissue. Zip the bag shut almost all the way, leaving just enough room to slip in the baking soda tissue. Drop in the tissue and zip the bag completely shut. Put the bag down on the ground and watch as it expands and eventually explodes.
Watch as yeast acts as a catalyst to create foam in this fun and messy experiment. Make sure you are using a surface that is easy to clean. Put on safety goggles to protect your eyes. Pour 1/2-cup of 6 percent solution hydrogen peroxide into a 16-ounce plastic bottle. Add a few drops of food coloring to the bottle. Place 1 tbsp. of liquid dish soap into the bottle and mix the ingredients together. In another cup, combine 3 tbsp. of warm water with 1 tbsp. of dry yeast and mix them for about 30 seconds. Next pour the yeast mixture into the bottle through a funnel and watch as foam begins to form and comes out the top of the bottle. To experiment with this demonstration, try changing the amount of yeast or the size of the bottle to see if it makes a difference in the effect.
Fill a clear glass 3/4 full of water and add food coloring of your choice. Slowly pour 1/4-cup of vegetable oil into the cup of water. Sprinkle 1 tsp. salt on top of the oil and watch as blobs of "lava" move up and down in the glass. You can continue the effect by adding another tsp. of salt. Students can learn about density as they watch this demonstration because the oil floats on top of the water. As the salt is added, it sinks into the mixture, bringing some oil down with it. Once the salt dissolves, the oil floats back to the surface.