Water Properties Lab
Adhesion: The ability for water to stick to each other.
Cohesion: The ability of water to stick to other substances.
Cohesion: The ability of water to stick to other substances.
Water and Alcohol1. Which feels cooler?
Alcohol 2. In order to get rid of excess heat you sweat. The sweat (water) evaporates away and takes with it heat energy. Why is it beneficial that your sweat is water and not alcohol based? Water takes a longer time before it evaporates so it cools you off more. While alcohol takes a shorter time to evaporate. Paper Clips on the Surface of a Cup of WaterAfter carefully placing a paper clip into the cup of water, we are able to conclude that the paper clip did indeed float in the water due to surface tension with the water.
Surface Tension and SoapOnce a drop of soap was added, the paper clip sunk.
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Water on a Penny3. Predict how many drops of water you think will fit on a penny: 23
4. How many drops fit on the penny? 45 drops How was your penny able to hold that many drops? Due to the surface tension as well as adhesion. Graduated CylinderThe water line is not a straight line because adhesion allows the water to stick on the sides of the glass forming a meniscus. The water property of adhesion is important in living systems because adhesion allows water to stick to the sides of blood vessels/vascular tubes in the plants.
Capillary ActionCapillary Action is important to plants and trees because this process allows water to be pulled up the roots and onto the top of the plant.
The following day, both the cups were evenly filled due to the capillary action. |
Water on Wax PaperObservations:
Because of surface tension the water stayed in a ball and when the wax paper moved, the water would slide across it. Water as a SolventThe salt does dissolve as well as the sugar but the oil does not dissolve. Polarity allows water to be a powerful solvent. Two other things that dissolve in water is food coloring and bleach. Two things that would not dissolve in water would be wax and gasoline.
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