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Water Unit

Water Unit. Warm Up: Write 10 facts you already know about water. What is WATER?. Water is a molecule It is also a compound. Why? What makes is a compound?. What is WATER?. The word water usually refers to water in its liquid state. What is WATER?.

gregory-bernard
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Water Unit

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  1. Water Unit Warm Up: Write 10 facts you already know about water.

  2. What is WATER? • Water is a moleculeIt is also a compound. Why? What makes is a compound?

  3. What is WATER? • The word water usually refers to water in its liquid state.

  4. What is WATER? • Pure water has NO smellor taste, and a pH of 7 so it is not acidic or basicThat makes it NEUTRAL

  5. Structure of Water • One water molecule is:Two hydrogen atoms (H2) chemically bonded to one oxygen atom (O)

  6. Structure of Water • Hydrogen ends are slightlymore positive. • Oxygen end is slightlymore negative. • This means that water is a polarmoleculeWHY?????

  7. Models of Water Molecules

  8. Let’s let TED explain it!

  9. Properties of Water Water has four properties that make it unique. • Cohesion • Adhesion • Capillary Action • Universal Solvent

  10. Cohesion is when water molecules stick to otherwatermolecules (attract each other like magnets) • Cohesion at the surface of water is called surface tension.

  11. SURFACE TENSION PICS

  12. More SURFACE TENSION PICS Surface Tension – Cohesion at the surface creates a thin “skin” on the water.

  13. More SURFACE TENSION PICS

  14. Adhesion is when water molecules stick to othermaterials Dew –water drops on a spider’s web.

  15. Capillary Action • When a liquid movesup very narrow tubes because of cohesionand adhesionagainst gravity. • Ex: plants bring water up through their roots to their stems and leaves

  16. Capillary Action • A meniscus is when the liquid “climbs” the sides of a graduated cylinder. glass surface

  17. Water in Space

  18. Universal Solvent • Water’s polarity gives it the ability to dissolve many different substances. • Almost every substance can dissolve in water over time.

  19. Universal Solvent Almost…

  20. 3 States • Water is the onlysubstanceon Earth that commonly exists in all 3 states. • Liquid – Water • Solid – Ice • Gas – Water Vapor

  21. Changing States Water can easily move between its three different states through several natural processes

  22. WATER

  23. Another way of looking at changes in state!

  24. Websites from the Presentation http://www.brainpop.com/science/earthsystem/water/ http://ed.ted.com/lessons/how-polarity-makes-water-behave-strangely-christina-kleinberg http://www.youtube.com/watch?v=oAY3yISf-24Other cool water related videos http://www.surfline.com/video/premium-partner-video/rubber-souls-new-zealand_103895(Surfing) https://www.youtube.com/watch?v=BickMFHAZR0(Capillary action in trees) https://www.youtube.com/watch?v=ph8xusY3GTM(Super-cooled water) https://www.youtube.com/watch?v=D-wxnID2q4A(Walking on water – sort of!)

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