Surface Tension and Water Properties

The video tutorial demonstrates various experiments to explore the properties of water. It begins with a penny experiment to see how many water drops can fit on a penny. Next, it explores how water behaves on wax paper with food coloring. The interaction of soap with water is then examined, showing how soap affects water cohesion. Finally, the concept of surface tension is demonstrated using a paper clip floating on water, and the effect of soap on this setup is observed.

How many drops of water did Mrs. Smith initially guess would fit on the penny?

• 15

• 5

• 20

• 10

What was the actual number of water drops that fit on the penny?

• 15

• 27

• 20

• 25

What happens to water drops on wax paper when they are rolled around?

• They evaporate

• They combine with each other

• They disappear

• They change color

What property of water is being tested when drops combine on wax paper?

• Adhesive

• Cohesive

• Evaporative

• Conductive

What effect does adding soap have on a water drop on wax paper?

• It makes the drop larger

• It changes the color of the drop

• It makes the drop evaporate

• It causes the drop to burst and separate

What is the purpose of the paperclip experiment?

• To measure water temperature

• To demonstrate surface tension

• To observe water color change

• To test water purity

Why does the paperclip initially float on the water?

• Due to surface tension

• Because of its weight

• Because of water temperature

• Due to water purity

What happens to the paperclip when soap is added to the water?

• It floats higher

• It sinks

• It changes color

• It dissolves

What is the effect of soap on the surface tension of water?

• It decreases surface tension

• It has no effect

• It makes the water evaporate

• It increases surface tension

What should students do after completing the pre-lab and post-lab questions?

• Post on the discussion board

• Discuss with peers

• Submit their answers

• Ignore the results