Based on the lab conditions below, determine the answers to all questions highli

Question

Based on the lab conditions below, determine the answers to all questions highlighted in yellow.

To investigate the cohesive and adhesive properties of water, Fill a glass with tap water until the water comes right up to the top edge ...and then continue to add water (use a spoon, if needed) to OVERPOUR the glass until you can see a dome of water when you look at the glass from the side. {Where is the adhesion happening, and where is the cohesion happening?} Finally, hold a toothpick (or half a toothpick, if your glass is too small for a whole one) parallel to the dome of water and gently drop it onto the water. Be sure the toothpick is small enough so it is not resting on the glass! {What happened, and how is this related to cohesion?} Take a SIDE-VIEW picture of your toothpick floating on your water dome. You can toss the toothpick and dump the water down the drain now.

Explanation / Answer

Question: Where is the adhesion happening and where is the cohesion happening?

Answer:

When we add few more drops to a filled glass of water, it overflows. Before it overflows, the water forms a dome-like shape above the rim of the glass. This dome-like shape forms due to the water molecules’ cohesive properties, or their tendency to stick to one another.

The attraction between water molecules and the glass walls of the tube (adhesion) and interactions between water molecules (cohesion). Cohesion refers to the attraction of molecules for other molecules of the same kind and adhesion is the attraction of molecules of one kind for molecules of a different kind.

Question: What happend and how is it related to cohesion?

ANswer: Cohesive forces are responsible for surface tension. Surface tension causes water to form spherical droplets and allows it to support small objects, if they are placed carefully on its surface.

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