Surface tension

What is the property of a liquid due to which its free surface tries to have minimum surface area?

• Viscosity

• Buoyancy

• Surface tension

• Rigidity

What is the difference between cohesion and adhesion?

• Cohesion is the attraction between the same substance and adhesion is the attraction of different substances

• They both attract different substances

• They both attract the same substance

• They don't attract anything

Draw a surfactant molecule and indicate its hydrophilic part and hydrophobic part.

Which of the following contribute to the reason behind the origin of surface tension?

• Only cohesive forces

• Only adhesive forces

• Neither cohesive forces nor adhesive forces

• Both cohesive forces and adhesive forces

An increase on the temperature causes a decrease on the surface tension.

• Agree

• Disagree

What is the main cause of capillarity?

• Difference in weight of fluids

• Pressure difference

• Temperature difference

• Velocity gradient

The surface energy of a substance is defined as:

• The energy required for the formation of a new unit area of surface

• The strength of the bonds that hold the substance together

• The energy released when a new unit area of surface is created

• The extent to which water wets the surface of the substance at room temperature

Refer to the picture of water sticking to a leaf, this is occuring because of:

Define attraction force.

Which characteristic of water will allow a paperclip to remain floating on water when the paperclip is gently placed on top of the water?

• Adhesion

• Surface tension

• Solvent properties

• Non-polar