Mr McAlonan - Water Flashcards
What charge does a water molecule have
A water molecule has an unequal distribution of charge therefore making the molecule polar
What is the bonding in a water molecule
It’s covalently bonded
Describe The surface tension of water
On the surface tension of water happens due to slight attraction between two different oxygen atomsAs a watermark yours are slightly charged the negative being the oxygen atom is slightly attracted to the hydrogen atom which is positively charged.
What is capillary action
Cohesive and adhesive forces lets the flow of water up leading to cohesion
How does your body benefit from excreting water molecules in sweat
By excreting water molecules such as sweat onto the skinLeading to the heat being used to heat up the water but due to the high specific heat capacity of water when it evaporates it takes the heat with it therefore cooling you down and thermostable
Why does water have such a high specific heat capacity
What has such a high specific heat capacity as it takes lots of energy such as heat energy to break the intermolecular bonds for evaporation.
How do you pond skaters skate on water
Pond skaters skate on water due to the surface tension of the water as they are not breaking the bonds between oxygen and hydrogen atoms it therefore provides a surface for the pond skaters to skate on.
Is water is a solvent
What is a very good Solvent as it is polar due to nature this means that minerals and irons, plasma, sucrase in Pholem sap, urea in urine how all dissolved in water
How does solid water (ice) benefit aquatic animals
Due to the less dense solid water it means that it floats on top of liquid water and not freezing throughout leaving an ecosystem for aquatic animals to live in in colder conditions
How does water being transparent benefit plants and animals
Due to the fact that water is transparent it is very useful for photosynthesis in plants and enables aquatic animals to see their food and their predators.
Does water support more weight
Aquatic animals are much bigger than land animals this is due to the weight of the animals and in the water you have an hour to ask which leads to the ward to be able to support the weight
What is beneficial towards are having low viscosity
Having a low viscosity full of water means that the flow of blood is very Easy to flow and is naturally lubricating and it makes it useful for synovial fluid
What is adhesion
- Adhesion is the force of attraction between two particles of different substances (e.g. water molecule and xylem wall)
- The xylem wall is also polar and hence can form intermolecular associations with water molecules
- As water molecules move up the xylem via capillary action, they pull inward on the xylem walls to generate further tension
What is cohesion
- Cohesion is the force of attraction between two particles of the same substance (e.g. between two water molecules)
- Water molecules are polar and can form a type of intermolecular association called a hydrogen bond
- This cohesive property causes water molecules to be dragged up the xylem towards the leaves in a continuous stream
What is the cohesion tension theory
- Water vapour diffuses/evaporates out of the leaf via the stomata (transpiration) from an area of high ψ to an area of low ψ.
- This loss of water creates a low hydrostatic pressure at the top of the xylem (i.e. in the leaf).
- Water is drawn into the xylem in the root (higher hydrostatic pressure). Pressure gradient is created.
- This creates a tension (suction) in the xylem which pulls up water in a continuous column.
- Within the xylem vessels the columns of water are held together by cohesion (the molecules are hydrogen bonded to each other) and by adhesion (the attraction between a water molecule and the walls of the xylem vessels).
- Column (of water) is pulled up by tension.
