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Water

Water. By Neil Bronks. Water is important. 70% of the earth 89% of the human body Only 3% is fresh and most of that is in the polar ice caps. Water is a compound. Chemically bonded atoms of Oxygen and Hydrogen. H. O. O. O. H. H. H. H. O. H. H. H. 2H 2 + O 2  2H 2 O.

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Water

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  1. Water By Neil Bronks

  2. Water is important • 70% of the earth • 89% of the human body • Only 3% is fresh and most of that is in the polar ice caps

  3. Water is a compound • Chemically bonded atoms of Oxygen and Hydrogen H O O O H H H H O H H H 2H2 + O2 2H2O

  4. Ice Floats • Most substances contract and get denser as they become a solid More dense solid sinks

  5. Ice Floats • Ice expands and so floats on water. • Lucky for us Less dense solid floats

  6. Frozen Pond

  7. Water Cycle

  8. Water Treatment Screening - Clean water passes through the screen and large objects do not

  9. Sedimentation • Alum (Aluminium Sulphate) is added that makes all the dirt stick together. • Most sinks

  10. Then Filter through sand

  11. Add Chlorine Cl • Kills the bacteria

  12. Add Fluorine F • Prevents tooth decay

  13. Water Treatment Screening - Clean water passes through the screen and large objects do not pass Sedimentation - Aluminium Sulphate is added. It is mixed slowly and then allowed to settle. Filtration – passes through sand Add chlorine to kill bacteria. Add flourine to prevent tooth decay.

  14. Desalination • Removing salt Stone Clear Plastic Sea Water Pure Water

  15. Electrolysis of Water

  16. Electrolysis of Water Water separated into gases using electricity Some acid must be added to increase conduction

  17. Algal Bloom • Too much fertiliser or food waste can feed algae causing a harmful algal bloom • This uses up all the oxygen and kills fish

  18. Add Soap solution Add Soap solution Hard and soft water • Add soap and mix Soft Water Lots of Bubbles Hard Water Few Bubbles Oily scum

  19. Hard Water • Contains dissolved calcium and magnesium ions • Forms scum when soap is used • Scale on inside of pipes and kettles

  20. Where hard water comes from Acid Rain Limestone Water that runs off straight to rivers and lakes is soft water Water dissolves the limestone (Calcium Carbonate) and the calcium ions make the water hard

  21. Removing Hardness from water • Distillation • Ion exchange with Zeolite resins • Soft water better for industry and plumbing • Hard water better for your heart

  22. Advantages and Disadvantages of Hard and Soft Water

  23. Summary

  24. H/w P 250 Q 1,2,4,5,6,8.

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