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Water<br />
Water<br />Water is the medium in which all reactions take place in living cells.<br />Materials are moved across body in ...
Properties of water<br />Water molecule is slightly polarised - slight negative charge (in oxygen atom) and slight positiv...
Properties of water<br />Water is excellent solvent<br />Water has one of the highest known surface tensions<br />Water mo...
Emulsions and Suspensions<br />Water insoluble substances form emulsions or suspensions<br />Emulsions are tiny droplets o...
Emulsions and Suspensions<br />Blood is a suspension of cells in plasma.<br />Fats are usually transported as emulsions in...
Water strider<br />
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Water

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Water

  1. 1. Water<br />
  2. 2. Water<br />Water is the medium in which all reactions take place in living cells.<br />Materials are moved across body in watery medium.<br />Water is a major habitat (oceans, rivers, ponds and lakes)<br />70% of the body is water.<br />
  3. 3. Properties of water<br />Water molecule is slightly polarised - slight negative charge (in oxygen atom) and slight positive charge (in hydrogen atoms)<br />Because of this dipole, water molecules can form hydrogen bonds.<br />Due to this water molecules 'stick together'<br />Therefore water has a high melting and boiling points (it takes more energy to overcome the attractive forces of hydrogen bonds)<br />
  4. 4. Properties of water<br />Water is excellent solvent<br />Water has one of the highest known surface tensions<br />Water molecule is amphoteric<br />(Water can act both as an acid ad as a base)<br />
  5. 5. Emulsions and Suspensions<br />Water insoluble substances form emulsions or suspensions<br />Emulsions are tiny droplets of one liquid suspended in another liquid<br />Suspensions are formed when a solid is mixed with a liquid and particles will separate out in the mixture is not constantly stirred.<br />
  6. 6. Emulsions and Suspensions<br />Blood is a suspension of cells in plasma.<br />Fats are usually transported as emulsions in a watery medium.<br />
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  8. 8. Water strider<br />

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