Biological Molecules - (1) Water
This is a mind map that summarises the function, structure and properties of water.
- Created by: SANUJA
- Created on: 12-04-14 19:05
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- 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.
- Solvent- Substances can dissolve in it
- 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
- -ve charge oxygen atoms of a water molecule attracts +ve charge of hydrogen atoms of other water molecules.
- 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.
- Water is a dipole molecule= one positive end that will be added to a negative end and a negative end attracted to positive ions.
- 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)
- This makes water very cohesive- water have high cohesion due to the molecules being dipole
- dipole nature
- Functions of Water
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