Water - uses, structure, properties and more.

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Water and its functions

  • Water is vital to living organisms
  • 80% of cells contents are water
  • Water is a reactant in loads of chemical reactions, e.g. photosynthesis and hydrolysis reactions
  • Water is a solvent - some substances can dissolve in it. Most biological reactions take place in a  solution.
  • Water transport substances - as solvent and liquid easily transport all types of materials, e.g. glucose, oxygen around plants and animals.
  • Water helps temperature control - carries heat away (when it evaporates) from a surface, which cools the surface and lowers the temperature.

Water molecule structure

  • H2O - Two hydrogen atoms and One oxygen atom by shared electrons
  • Because shared negative hydrogen electrons are pulled towards oxygen atom, other side of hydrogen atoms is slightly positive charge.
  • The unshared negative electrons on the oxygen atom give it a slight positive charge.
  • This makes water a POLAR molecule, negative charge on one side and positive charge on the other.
  • Negative side of the H2O (Oxygen) attract the positive side of other water molecules (hydrogen).
  • This attraction is called hydrogen bonding - gives



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