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WATER
Cape structure and properties of water
| Question | Answer |
|---|---|
| Describe Cohesion and Surface tension in water | The hydrogen bonds contribute to cohesion the attachment of water molecules sticking together, the surface tension is also created. |
| Describe Cohesion and Surface tension in organisms | The high cohesion supports the water in xylems, which help with easy transport |
| Describe Cohesion and Surface tension in the environment | Pond skaters and mosquitoes can land on the surface and feed on organisms, while light plants can float on the surface |
| Describe water being a good solvent for charged substances | Water can be a solvent for ionic compounds and other polar substances. E.G: NaCl, the Na+ is attracted to the slightly negative charged oxygen and the Cl- is attracted to the slightly positive charged hydrogen. Preventing individual ions separating. |
| Describe water being a good solvent for charged substances in organisms | Good solvent in cells, blood, plasma, lymph, phloem and xylem taps |
| Describe water being a good solvent for charged substances in the environment | Solvent for nutrients and gases |
| Describe the high specific heat capacity of water | It takes 4.2 J of energy to raise 1g of water by 1 degree Celsius and break hydrogen bonds |
| Describe the high specific heat capacity of water in for organisms | Organs will not undergo rapid changes in body temperature. |
| Describe the high specific heat capacity of water in the environment | High specific heat capacity will limit temperature changes in the oceans |
| Describe freezing in water | When water freezes the density decreases, allowing it to flat on its liquid state |
| Describe freezing in water for the environment | In cold regions in the winter ponds will freeze over creating a form of insulation for the organisms in the pond making them survive |
| Describe high latent heat of vaporization | Large thermal energy is needed to change water to vapor |
| Describe high latent heat of vaporization in organisms | Sweating and transpiration provide methods of cooling |
| Describe high latent heat of vaporization in the environment | Water in shallow bodies will not evaporate too quickly |
| Describe the reactiveness of water | Water splits into hydrogen and hydroxyl ions, participating in lots of reaction |
| Describe the reactiveness of water in organisms | Used as a raw material in photosynthesis |
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