5 The Water Molecule

5 The Water Molecule - Water, Life, Civilization: Why...

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Unformatted text preview: Water, Life, Civilization: Why Water? Water: H 2 O Water: H 2 O H H H H O S Water Hydrogen Sulfide Water and Similar Compounds H 2 S H 2 O Hydrogen Sulfide: H 2 S Water: H 2 O Boiling Point and Freezing Point F.P B.P liquid range Water (H 2 O) o C 100 o C 100 o C Hydrogen Sulfide (H 2 S) -84 o C -60 o C 24 o C Hydrogen Selenide (H 2 Se)-64 o C -42 o C 22 o C Hydrogen Telluride (H 2 Te) -49 o C 2 o C 47 o C Water is the only substance that exists as a gas, solid, and liquid at ambient earth temperatures Solid Gas H 2 O Two hydrogen atoms One Oxygen atom What makes water so unusual? Hydrogen: 1 electron (-), 1 proton (+) Oxygen: 8 electrons (-), 8 protons (+) In water, the hydrogens shares their one electron with oxygen, which shares one of its electrons with each hydrogen. This sharing of electrons forms the bond between hydrogen and oxygen atoms to make the water molecule. Nucleus 1 Proton (+) 1 Electron (-) Hydrogen H Oxygen O 8 electrons e-e-e-e-e-e-e-e-Outer shell 8 protons The outer shell of electrons determines reactivity Oxygen O e-e-e-e-e-Outer Shell e-Atoms prefer 8 electrons in the outer shell e-e-How does oxygen exist in the atmosphere?...
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5 The Water Molecule - Water, Life, Civilization: Why...

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