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WATER. Water Formula threeA water molecule ( H 2 O ), is made up of three atoms = one oxygen and two hydrogen. H H.

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Presentation on theme: "WATER. Water Formula threeA water molecule ( H 2 O ), is made up of three atoms = one oxygen and two hydrogen. H H."— Presentation transcript:

1 WATER

2 Water Formula threeA water molecule ( H 2 O ), is made up of three atoms = one oxygen and two hydrogen. H H

3 Water is Polar! each water molecule has a slightly negative and a slightly positive end (pole) oxygennegativeThe oxygen end acts negative hydrogenpositiveThe hydrogen end acts positive POLARCauses the water to be POLAR neutral Zero Net ChargeOverall, Water is neutral (equal number of e- and p+) --- Zero Net Charge

4 Hydrogen Bonds Exist Between Water Molecules Formed between a highly Electronegative atom of a polar molecule and a HydrogenFormed between a highly Electronegative atom of a polar molecule and a Hydrogen Many hydrogen bonds are strongMany hydrogen bonds are strong Water vs AlcoholWater vs Alcohol

5 Interaction Between Water Molecules

6 What are the Properties of Water (in todays class)?

7 Properties of Water (in todays class) CohesionCohesion AdhesionAdhesion

8 Cohesion Attraction between particles of the same substance (why water is attracted to itself)Attraction between particles of the same substance ( why water is attracted to itself) Results in Surface tension (a measure of the strength of waters surface)Results in Surface tension (a measure of the strength of waters surface) Produces a surface film (almost like skin on waters surface) on water that allows insects to walk on the surface of waterProduces a surface film (almost like skin on waters surface) on water that allows insects to walk on the surface of water 3:593:59 https://www.youtube.com/watch?v=RphuMEUY3Oghttps://www.youtube.com/watch?v=RphuMEUY3Og

9 Adhesion Attraction between two different substances.Attraction between two different substances. Water will make hydrogen bonds with other surfaces such as glass, soil, plant tissues, and cotton.Water will make hydrogen bonds with other surfaces such as glass, soil, plant tissues, and cotton. Capillary action-water molecules will tow each other along when in a thin tube.Capillary action-water molecules will tow each other along when in a thin tube. Example: transpiration process which plants and trees remove water from the soil, and paper towels soak up water.Example: transpiration process which plants and trees remove water from the soil, and paper towels soak up water. https://www.youtube.com/watch?v=At1BJJDcXhk :13-1:01

10 Adhesion Causes Capillary Action Which gives water the ability to climb structures 3:49-4:31 Thorny Devil example https://www.youtube.com /watch?v=ZUsARF-CBcI

11 Adhesion Also Causes Water to … Form spheres & hold onto plant leaves Attach to a silken spider web

12 Properties of Water cont. Less Dense as a solidLess Dense as a solid

13 Water is Less Dense as a Solid Ice is less denseIce is less dense as a solid than as a liquid (ice floats) hydrogen bonds constantly being broken and reformed.Liquid water has hydrogen bonds that are constantly being broken and reformed. Frozen water crystal-like latticeFrozen water forms a crystal-like lattice whereby molecules are set at fixed distances. 47 sec https://www.youtube.com/watch?v=NQhjAtCKghE

14 Water is Less Dense as a Solid Which is ice and which is water?Which is ice and which is water?

15 Water is Less Dense as a Solid WaterIce


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