PROBLEM: How can you explain different properties of water?
MATERIALS: water, beaker, pepper, detergent, alcohol, capillary
tube, washing soda, rice, sugar
PROCEDURE: Experiment 1. Partially fill a glass with
water. Sprinkle pepper all over the surface. Now drip a drop of liquid
detergent onto the surface, in the center of the peppered area. Record
what happens and why?
Drop a little alcohol on a peppered surface. What happens?
Experiment 2. Try and suck water through a capillary tube (like
you would through a drinking straw). What happens and why?
Experiment 3. Using 250 ml of water, try to dissolve 1 ml of
salt, fine sand, tea leaves, washing soda, rice, and sugar. Record what
happens. Warm the water with a Bunsen burner or heating surface. Try and
dissolve the same amount of substance in warm water. Record what
CONCLUSION: Identify the scientific principle in each experiment?