Surface Tension and Water Properties

In this video, Ryan and Teresa explore the concept of surface tension using a simple experiment with water and pennies. They explain how surface tension is the tendency of a liquid's surface to resist external forces, such as gravity. The video outlines the necessary equipment and safety precautions, then guides viewers through the experiment, demonstrating how water forms a dome above the glass rim due to cohesive forces. The video also delves into the molecular structure of water and how surface tension interacts with gravity. Finally, the hosts encourage viewers to engage by sharing their own experiment results.

What is the primary force that surface tension resists?

• Electricity

• Gravity

• Magnetism

• Friction

Which of the following is NOT needed for the surface tension experiment?

• Bowl of pennies

• Glass measuring cup

• Food coloring

• Bunsen burner

What should you do if the water surface shakes after dropping a penny?

• Add more water

• Remove the penny

• Wait for it to settle

• Stir the water

What shape do water molecules form due to their atomic structure?

• Square

• V-shape

• Linear

• Circular

What is the term for the force that causes water molecules to stick together?

• Compression

• Tension

• Cohesion

• Adhesion

Why are the cohesive bonds stronger at the surface of the water?

• Due to higher temperature

• Because of the presence of air molecules

• Due to the presence of salt

• Because of increased pressure

What happens when the force of gravity exceeds the surface tension in the experiment?

• The water evaporates

• The water freezes

• The water spills over

• The water changes color

What shape does the water form at the top of the glass due to surface tension?

• Convex dome

• Flat

• Pyramid

• Concave

What is the final step in the experiment before the water spills over?

• Stirring the water

• Adding more water

• Adding more pennies

• Removing pennies

What should viewers do if they conduct the experiment at home?

• Share their results on social media

• Keep the results private

• Ignore the results

• Send results to a lab