Water Revision Notes
- Created by: pheebsleigh99
- Created on: 12-10-16 17:43
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- Water
- As a solvent...
- Living organisms obtain key elements from aqueous solutions
- Water molecules attract ions and other molecules and then dissolve in water so chemical reactions occur
- Attracts as a transport medium e.g Water transports minerals in the xylem and sucrose and amino acids in the phloem
- Water is a metabolite...
- It is used in many biochemical reactions as a reactant e.g With CO2 to produce glucose in photosynthesis
- Many reactions involve hydrolysis
- In condensationreactions, water is a product
- Has a high specific heat capacity...
- Large amount of heat energy is needed to raise its temperature
- Hydrogen bonds restrict movement which restricts an increase in kinetic energy and therefore resisting temp. rise
- Prevents fluctuations in water so aquatic habitats remain stable and it allows enzymes within cells to work effectively as they d not have to adapt
- High latent heat of vaporisation...
- A large amount of heat energy is required to change it from a liquid to a vapour
- Important in temperature control where heat is used to vaporise water from sweat on the skin
- Provides benefit for aquatic organisms as so much energy would be required to vaporise the water that aquatic habitats rarely evaporate away
- Cohesion...
- Hydrogen bonds are strong, due to there being many of them, the molecules stick together in a lattice
- Allows columns of water to be drawn up xylem vessels
- High surface tension...
- At ordinary room temperature it has the highest surface tension except mercury
- Cohesion between molecules at the surface produces tension and allows the body of an insect to be supported
- High density...
- As a habitat for aquatic organisms it provides support bouyancy
- Ice is less dense due to hydrogen bonds holding water molecules further aapart
- Ice is a good insulator and prevents large bodies of water from losing heat so organisms can survive
- As a solvent...
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