2-The Properties of Water Review Sheet

2-The Properties of Water Review Sheet - PROPERTIES OF...

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PROPERTIES OF WATER REVIEW SHEET EXERCISE #2 Biology 111 Properties of Water What does it mean when we say that water is a polar molecule? Water has opposite charges on opposite sides. H+ and O- Where are the negative charges on a water molecule? Positive charges? Oxygen has the negative charges while Hydrogen have the positive. What is the overall charge on a molecule of water? The positive and the negative charges cancel out for the overall charge is neutral. Why does water remain a liquid when other molecules of the same size are gasses? (end of page 15) The polar nature of water causes its molecules to weakly bond together causing water to remain a liquid when other molecules this size are gases. What is cohesion? The attraction between water molecules How does cohesion differ from adhesion? Adhesion is the attraction that water molecules have for other materials. I.e.: plastic, metal, etc. What is surface tension? How is this concept related to cohesion? Surface tension is the cohesion of water molecules. Once the surface tension is broken the hydrogen bonds break and reform (cohesion). What is capillary action? How is that related to adhesion? Capillary action relies on adhesive properties. It helps plants pull water from the soil into its roots. What is surface tension? Surface tension is the name commonly given to the cohesion of water molecules. It caused water to pull into the shape with the smallest surface area.
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