AS Biology OCR Water Properties
- Created by: Sorcha
- Created on: 04-04-13 14:59
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- Properties of Water
- Surface Tension
- Water molecules stick together through hydrogen bonding creating surface tension
- the surface can act like an elastic sheet therefore becoming strong and difficult to break
- Resembling a stretched membrane, a habitat can survive on the surface of the water.
- transport up the xylem relies on the cohesion of water molecules.
- Latent Heat
- while changing state, either taking in heat energy or expelling heat WITHOUT a change in temperature
- evaporation of water can cool surfaces by removing heat
- due to the hydrogen bonds they restrict movement of molecules therefore a large amount of energy is needed to change the temperature
- ocean is a very stable environment
- Density of Water
- When in solid form water is less dense
- ice floats on water. therefore water below is insulated and less likely to freeze
- polar bears live in these environments. Aquatic organisms can survive when temperature drops because of this.
- Colour
- Water is colourless
- this means sunlight can reach cells and pass through so photosynthesis can occur
- Solvent
- the solubility of a substance depends on whether water molecules can interact with it
- metabolic processes in all organisms depend on this
- Surface Tension
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