Water Properties: Adhesion and Cohesion

Why do water droplets tend to form a spherical shape?

• Water molecules are repelled by each other.

• Water molecules are attracted to the surface they are on.

• Water molecules are attracted to each other, pulling inward to form a sphere.

• Gravity pulls the water molecules into a spherical shape.

What is cohesion?

• Particles of the same substance are attracted to each other.

• Particles of different substances are attracted to each other.

• Particles repel each other due to magnetic forces.

• Particles move randomly without any interaction.

What shape would a water droplet take if it were not pressed against any surface, such as in orbit?

• It would flatten out due to air pressure.

• It would form a perfect sphere due to surface tension.

• It would break apart into many smaller droplets.

• It would evaporate instantly.

When pouring water from one glass to another, why does some water tend to stick to the side of the pouring glass and spill?

• Adhesion, causing water to stick to the glass.

• Cohesion, causing water molecules to stick together.

• Surface tension, making the water too strong to pour smoothly.

• Gravity, pulling the water away from the glass.

What is adhesion?

• The attraction between particles of the same substance.

• The force that causes liquids to evaporate quickly.

• The resistance of a liquid to flow.

• The attraction between particles of one substance and another substance.

Why does water form a curved surface (meniscus) in a narrow test tube, with the edges appearing higher than the center?

• The water molecules are repelled by the glass, pushing the edges down.

• The water molecules are attracted to the glass, pulling the edges up.

• Air pressure pushes down on the center of the water surface.

• The test tube is not perfectly level.

How do fog nets collect water from the air?

• They use gravity to pull water vapor directly from the air.

• They absorb water through a chemical reaction with the air.

• They only work in areas with high rainfall, not fog.

• They use adhesion to collect water molecules from the air and cohesion to form larger drops.