Biological Molecules - (1) Water

This is a mind map that summarises the function, structure and properties of water. 

HideShow resource information
  • Created by: SANUJA
  • Created on: 12-04-14 19:05
View mindmap
  • Water
    • Functions of Water
      • Solvent- Substances can dissolve in it
        • Useful for biological reactions that occur in solution
      • Transportation-when substances are dissolved in water transporting is easier therefore it is easy for water to transport because it is a solvent.
        • For example water can therefore transport substances such as glucose and oxygen around plants and animals.
    • Structure of water
      • molecules of water have a simple strcuture
      • Contain 1 Oxygen atom and 2 hydrogen atoms by shared electrons
      • Shared -ve hydrogen electrons are pulled towards the oxygen atom, while the other end of the hydrogen atom is left with a slight +ve charge. Unshared -ve oxygen electrons give it a lsight -ve charge
      • Dipole molecule= -ve charge on one side of water molecule and +ve charge on other side of water molecule
        • -ve charge oxygen atoms of a water molecule attracts +ve charge of hydrogen atoms of other water molecules.
          • =HYDROGEN BONDING
    • Properties of Water
      • dipole nature
        • This makes water very cohesive- water have high cohesion due to the molecules being dipole
          • Water can flow which makes it useful for transporting
          • Cohesion=attraction between molecules of the same type.
        • Good Solvent
          • Many substances involved in biological reactions consist of ions where one atom has -ve charge and the other atom has +ve charge, for example Na+Cl- (salt)
            • Water is a dipole molecule= one positive end that will be added to a negative end and a negative end attracted to positive ions.
              • Ions will be surrounded by water molecules therefore will dissolve in water. This dipole nature of water makes it a very useful solvent for other polar molecules.

Comments

SANUJA

Hi guys, I have created a detailed revision mind map about everything you need to know about water in AS Level Chemistry (specifically for OCR A students). Please if you found this useful or if you have any suggestions on how to improve, please do comment. Thanks.

SANUJA

Hi guys, I have created a detailed revision mind map about everything you need to know about water in AS Level Chemistry (specifically for OCR A students). Please if you found this useful or if you have any suggestions on how to improve, please do comment. Thanks.

Similar Biology resources:

See all Biology resources »See all Biological molecules resources »