BM : Water Flashcards
(15 cards)
Where is water found in living organisms
- cytoplasm (all organisms)
- xylem/ phloem (in plants)
- tissue fluid and blood (in animals)
What can water also act as
Habitats for living organisms
water molecules are?
Dipolar
what are the charges of a water molecule
- Hydrogen has slightly positive charge
- oxygen has a slightly negative charge
water molecules can form what bonds with each other
hydrogen bonds
Water has a specific heat capacity, what does this mean?
A lot of heat needs to be applied before it evapourates due to the presence of hydrogen bonds between the water molecules
Ice is different compared to water how?
Its less dense so floats on top insulating the water beneath it
water molecules are dipolar, what does this mean?
means its a solvent
- they can separate out solutes based on their charge
+ attracts -
- attracts +
- so solute mixes with water and becomes dissolved
Why is water being a solvent helpful?
helpful in cytoplasm of cells
- useful in the processes of diffusion/ active transport, blood and phloem
Hydrostatic pressure of water explained
- water when pressured can provide a strong physical force
- used particularly in mass flow
- also helps support turgidity in plants
What is mass flow?
where mass of water carries large amount of substances
(phloem in plants)
(tissue fluid in capillaries)
how is homeostasis linked to water
- mammals sweat to control body temp
- sweat from skin uses heat from blood to evaporate, so cooling to individual
- because sweat (water) is made of hydrogen bonds, it has a stable structure
- so requires a large amount of heat to evaporate
called
latent heat of vaporisation
what are inorganic ions?
- salts/ minerals
what causes inorganic ions?
Inorganic = do not contain carbon ion = charge (-,+)
examples of inorganic ions
sodium ions
chloride ions
