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Biological Molecules - Water
5
Transcript
Biological Molecules
Water
Learning Objective
Learning objectives
- Decribe the structure of a water molcule
- Explain how water polar mocules occurs
- Decribe hydrogen bonding
- Decribe and explain the properties of water
Water Makes up about 80% Cells Contents
- Reactant
- Solvent
- Transports
- Helps with temperature control
- Habitat
Overview
Structure
Strcuture
- H2O
- Electrons are pulled towards the oxygen atom
- Unshared negative electrons on Oxygen gives it a slight negative charge
- Water polar molecule – Partial delta- &delta+
- Hydrogen bondin
Nucleus of Oxygen Atom
Unshaired Electrons
Shaired Electrons
Molecule
Nucleus of Hydogen Atom
Hydogen Bonds
Slightly Positively Charged Side
Polar
Slightly Negative Charged Side
Waters Structure Related To Its Proerites & Functions
Properties
High Specific Heat Capacity
High Specific Heat Capacity
- What is specific heat capacity?
- Energy needed
- Raise the temperture of 1g of a substance by 1 degrees
- H2O can absorbe a lot of energy due to HYDROGEN BONDS
- Takes alot of energy to heat H2O
- H2O does not need rapid temp changes - Good Habitat
- Temp under water is more likely to be more stable than on land
High Latent Heat Of Evaporation
High Latent Heat OF Evaporation
- A lot of energy is needed to break the hydogen bonds between the H2O molcules
- A lot of energy is used up when H2O evaporates
- H2O good at cooling things
- Sweat evporates it cools the surface of the skin
Very Cohesive
Very Cohesive
- What does cohesive mean?
- Atrraction betwen molecules of the same type
- H2O molecules "tend to stick together" because they are polar
- Helps with water flow - great for transporting substance
- H2O transported in plasnt stems int he transpiration steam
Good Solvent
- What does ionic mean?
- Substnaces made from one positively charged and one negatively charged atom eg salt (NaCl)
Good Solvent
Less Dense When Its Solid
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