Water Properties and Experiments

Dr. Julie introduces the concept of surface tension, explaining how water molecules form strong bonds due to their V-shaped structure, leading to phenomena like water sitting above a glass edge. She conducts two experiments: one demonstrating cohesion by counting water drops on a coin, and another showing adhesion by transferring water between glasses using a string. These experiments illustrate the properties of cohesion and adhesion, key aspects of surface tension.

What phenomenon allows water to sit above the edge of a glass?

• Evaporation

• Surface tension

• Condensation

• Gravity

What shape do water molecules have that contributes to surface tension?

• Triangular

• V-shaped

• Circular

• Square

What is the term for water molecules sticking to each other?

• Adhesion

• Osmosis

• Cohesion

• Diffusion

In the first experiment, what tool was NOT mentioned for dropping water on the coin?

• Spoon

• Eyedropper

• Straw

• Finger

How many drops of water were successfully placed on the coin in the experiment?

• 35

• 30

• 50

• 42

What was used to dye the water in the second experiment?

• Food coloring

• Soy sauce

• Paint

• Ink

What property allows water to travel down a string in the second experiment?

• Sublimation

• Adhesion

• Cohesion

• Evaporation

What must be kept tight to successfully transfer water using a string?

• The string

• The table

• The glass

• The water

What is the term for water sticking to other surfaces?

• Cohesion

• Adhesion

• Diffusion

• Osmosis

Where can you observe the effects of surface tension in nature?

• On a sunny day

• In a desert

• On a dry leaf

• On rainwater on leaves