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Water: My Favorite Molecule Ronald R. Martin Department of Chemistry University of Western Ontario.

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Presentation on theme: "Water: My Favorite Molecule Ronald R. Martin Department of Chemistry University of Western Ontario."— Presentation transcript:

1 Water: My Favorite Molecule Ronald R. Martin Department of Chemistry University of Western Ontario

2 Lets Meet Two Elements Introducing Hydrogen (H) The lightest element But 70% of the mass of the known universe.

3 Hydrogen In Space

4 Lets Meet Two Elements Introducing Hydrogen (H) The lightest element But 70% of the mass of the known universe. And Oxygen (O) or as it occurs in our Atmosphere O 2 About 20 % of the air we breathe is oxygen

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6 Atoms and Molecules Put atoms together and you get molecules, some very big, some very small

7 Molecules can be very small, such as H 2 (2 amu); or they can be huge, like proteins (> 10,000 amu) The protein cytochrome c consists of thousands of atoms, all linked by covalent bonds. Its mass is 12,360 amu

8 Putting Hydrogen and Oxygen Together Yields Water

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10 HOH or H 2 O

11 DensityDensity and phasephase 1000 kg·m 3, liquid (4 °C) 917 kg·m 3, solid Melting point0 °C, 32 °F (273.15 K) [2]°C°FK [2] Boiling point100 °C, 212 °F (373.15 K) [2] [2] Physical Properties of Water

12 Whats So Amazing About Water Lots, but most important to us: You Cant Have Life Without IT! About 70% of the Human Body is Water

13 Water in Outer Space

14 Water is a Major Component of Comets

15 Water Has been Found on the Moon,Moon on the planets Mercury, Mars, and Neptune,MercuryMarsNeptune on the dwarf planet Pluto,Pluto on satellites of planets, such as Triton and Europa.TritonEuropa The liquid form of water is only known to occur on Earth strong evidence suggests that it is present just under the surface of Saturn's moon Enceladus.SaturnEnceladus

16 Earth From Space It looks as if theres lots of water The bad news, there isnt !

17 Some Facts About Water On Earth Most of it is too salty to drink, or to be used for agriculture Much of the fresh water is frozen as ice

18 Much of Our Water is Frozen

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20 Some Facts About Water On Earth Most of it is too salty to drink, or to be used for agriculture Much of the fresh water is frozen as ice Some countries have a lot

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22 Some Facts About Water On Earth Most of it is too salty to drink, or to be used for agriculture Much of the fresh water is frozen as ice Some countries have a lot Some have very little, in fact 18 countries now have insufficient water for their needs, the economic and social consequences are immense.

23 Waterless Northern India

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25 Lets talk about Australia 80 % of all its agriculture is sustained by the Murray-Darling watershed.

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29 The Problem With The Murray- Darling Average peak flow per month: 2,000,000,000,000 liters Peak flow 2006 per month: 250,000,000,000 Peak flow 2007 per month: 100,000,000,000 Flow is now 1/20 peak average.

30 What The Darling Looks Like Today

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32 Reasons? Australia grows both cotton and rice at the sources of the Murray and the Darling Downstream demand increases as populations grow Control is fragmented, divided between the state and federal governments and is hopelessly out of date But there is a much bigger and more important reason!

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34 SO We know there is limited useful water on the surface of the earth. We know water use is increasing exponentially. We know we are changing the climate of the planet in ways that will adversely affect water supply and distribution. Its one of our most important molecules. Its time to start doing something to protect the resource.

35 Thanks Have a Drink Of Water


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