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Properties of Water

Properties of Water. Water Facts:. Formula = H 2 O Three phases – Solid, liquid, and gas Freezing point = 0˚C Boiling point = 100˚C Inorganic molecule (aka: non-living, does not contain Carbon) Polar molecule Universal solvent About 70% of human body is water. Polarity.

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Properties of Water

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  1. Properties of Water

  2. Water Facts: • Formula = H2O • Three phases – Solid, liquid, and gas • Freezing point = 0˚C • Boiling point = 100˚C • Inorganic molecule (aka: non-living, does not contain Carbon) • Polar molecule • Universal solvent • About 70% of human body is water

  3. Polarity • Polar molecules: • slightly positive at one end and slightly negative on the other end • Water is a polar molecule!!!!!! • Draw a picture definition of polarity on your note sheet in the empty box.

  4. Non-polar molecules: • No charge • Polar molecules dissolve in water • Non-polar molecules do not dissolve in water • “Like” dissolves “like”

  5. Universal Solvent • Solvent – substance that does the dissolving • Solute – substance dissolved in a solution • Solution – mixture of solvent and solute http://programs.northlandcollege.edu/biology/Biology1111/animations/dissolve.html

  6. Magic Sand Demo

  7. What lab displayed Polarity?

  8. Cohesion • Attraction between substances of the same kind • Ex: Water forming drops/beading • Caused by hydrogen bonds between water molecules

  9. Surface tension • Prevents the surface of water from stretching or breaking easily • Molecules at the surface of water are linked by hydrogen bonds • Result of cohesion

  10. Natures use of Surface Tension

  11. Drops on a penny Demo

  12. Adhesion • Attraction between different polar substances • Ex: things getting wet

  13. Capillary Action • Property in which water can travel up tubes • Powered by adhesion • Ex: plants, trees • Attraction between walls and water is greater than effect of gravity

  14. Celery Stalk Demo

  15. What lab displayed both adhesion and cohesion?

  16. Density • Ratio of the mass of an object to its volume • Density = Mass (g)___ Volume (ml) • The density of water = 1.0 • Density less than 1.0 = floats • Density greater than 1.0 = sinks • Ice floats, yet cold water sinks • in ice, molecules spread out (ex: soda can in freezer) • Cold water moves slower than warm water, causing it to sink

  17. Soda Can Demo

  18. What lab displayed density?

  19. What causes water to do the amazing things it does? Polarity

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