1. HYDROGEN OXYGEN WATER Jarmila Svobodová Martina Tomková Faculty of Chemistry University of Technology Brno 2005

2. H 2 O-water  the medium of life  the most important molecule in the world

3. The chemical composition of an organisms  70% water  30% chemicals Chemicals are made by: 15%proteins 6% RNA 4%ions 2%phospholipids 2%polysacharides 1%DNA

4. Structure  a water molecule  the bond is polar  negatively charged, positively charged  hydrogen bond 0,27nm  covalent bond 0,10nm bond-vazba(chemická) charged-nabitý

5. Animation  reaction two molecules of water  molecules of water join together in a hydrogen-bonded lattice  an animation structure of water lattice-mřížka

6. Elements  The relative abundance of elements in all living organisms And one of the most important elements is……. abundance-množství

7. OXYGEN vigorous - silný  a non-metallic, biogenic element  atomic number 8 of periodic table  a vigorous oxidizing agent  colourless, diatomic (O 2 )  second most common element in the Earth System by weight  component of water  photosynthesis

8. OXYGEN  1774  Joseph Priestley (13.3.1733 - 6.2.1804) discoverer of oxygen

9. OZONE O 3 bleaching – bělení,bělící layer - vrstva  active oxygen  colourless gas in armosphere  oxidation properties – water disinfection, bleaching substances  ozone layer x UV light

10. PHOTOSYNTHESIS 6H 2 O + 6CO 2  C 6 H 12 O 6 + 6O 2  six molecules of water plus six molecules of carbon dioxide produce one molecule of sugar plus six molecules of oxygen  sunlight energy  chemical energy

11. URL  http://www.woodrow.org/teachers/chemistry/institutes/19 92/Priestley.html http://www.woodrow.org/teachers/chemistry/institutes/19 92/Priestley.html  http://www.jergym.hiedu.cz/%7Ecanovm/objevite/objev/pr is.htm  http://www.emc.maricopa.edu/faculty/farabee/BIOBK/Bio BookPS.html http://www.emc.maricopa.edu/faculty/farabee/BIOBK/Bio BookPS.html  http://en.wikipedia.org/wiki/Ozone_layer