3.1.7 Water Flashcards
Polar molecule definition
A molecule with an uneven distribution of charge, resulting from different atoms in a molecule, being more or less able to attract electrons towards themselves
Which side of the molecule is slightly negative or positive
Oxygen is slightly negative due to large positive nucleus
Hydrogen is slightly positive
Bond form between two water molecules
Hydrogen bond
Definition of universal solvent property of water
Very capable of dissolving other charged particles
Describe the property of cohesion/ adhesion of water
Service tension : support some organism to walk on water without breaking the service
Water to flow in continuous column (blood & xylem vessel )
[transpiration stream/ cohesion tension theory]
Attracted to other polar or charged particles (adhesion) allowed water to move in columns up xylem vessel
Describe property of transparent of water
Allow light to penetrate through and reach aquatic plant can photosynthesise
Describe the properties of ice float on top of water (density)
Lakes freeze from the top down, insulating the water below, maintaining aquatic life beneath (survive)
Solid ice is less dense than liquid water
Describe the property of high specific heat capacity of water
Buffers change in temperature, making an aquatic environments, more hospitable
Even in cell
Thermostable
Why water have high specific heat capacity? (Definition included)
Do amount of heat need to rise to temperature of one kg of water to 1°C
Many hydrogen bonds holding the molecule together , need a lot of heat energy to break the bonds between them
Describe the property of metabolite of water
It plays a roll in chemical reaction, including hydrolysis and condensation
Breaking down of biological polymers, such as protein and carbohydrates
Hydrolysis : required water to break bonds between molecules
Condensation : water is form when large biological molecules are produced
Include Use in photosynthesis and respiration
Describe the property of universal solvent of water (e.g.)
Allowed metabolic reaction to occur
Allow substances to be transported
Because it attracts to any other charged ionic or polar molecule
E.g allows reactant, enzyme and product dissolve in the cytoplasm of a cell, other substance in blood plasma and tissue fluid
Describe the property of high latent heat of vaporisation of water
It provides a cooling effect
Advantage to organisms that sweat , because a lot of energy must be transferred from the organism to the water in order to cost it to evaporate
Why does water has a high latent heat of vaporisation?
It takes a lot of heat energy to break the hydrogen bond holdings of molecules together
What is dipole
Imbalance of charge, this result in polar molecules
What will happen when one dipole encounter another dipole
The positive end of one molecule will be weekly food to the negative end of the automatic you by weak hydrogen bond.
If the hydrogen bond accumulate, the strength of bond can be much higher
The importance of high heat capacity and large latent heat of vaporisation to living organism
Buffer change in temperature
Cooling effect
