High School

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Why did the dye travel up the capillary tube? Look up adhesion. How did this activity demonstrate adhesion?

A) Because of cohesive forces; the dye demonstrated adhesion by sticking to the walls of the capillary tube.

B) Because of adhesive forces; the dye demonstrated adhesion by spreading out evenly on the surface of the capillary tube.

C) Because of cohesive forces; the dye demonstrated adhesion by forming a meniscus at the top of the capillary tube.

D) Because of adhesive forces; the dye demonstrated adhesion by being pulled up against gravity along the walls of the capillary tube.

Answer :

Final answer:

The dye traveled up the capillary tube due to adhesive forces causing it to adhere to the walls and be pulled up, demonstrating capillary action.

Explanation:

The dye traveled up the capillary tube because of adhesive forces. These forces are at play when the attraction between the dye molecules and the walls of the capillary tube is stronger than the cohesive forces among the dye molecules themselves. As the dye molecules are attracted to and stick to the walls of the glass capillary tube, they are pulled up against gravity. This process is known as capillary action, and it demonstrates adhesion by showing how the dye adheres to the capillary walls.

The correct answer to the question is: D) Because of adhesive forces; the dye demonstrated adhesion by being pulled up against gravity along the walls of the capillary tube.

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