1.7 and 1.8 Water and inorganic ions Flashcards
Where are inorganic ions found?
in the cytoplasm or in body fluids
What does inorganic mean?
doesnt contain carbon
What are the roles of H+ ion?
sucrose loading in the phloem and controlling the pH of body fluids
what are the roles of Ca2+ ion?
muscle contraction and synaptic transmission
What is the role of PO4 3- (phosphate) ion?
nucleotide synthesis
What is the role of Na+ and K+ ions?
absorption in the ileum
What does a water having a high specific heat capacity mean?
takes more energy to heat a given mass of water
Why does water have a high specific heat capacity?
due to cohesion and hydrogen bonding
How does water make an aquatic environment stable?
acts as a buffer against sudden temp changes
What is the latent heat of vapourisation of water?
due to hydrogen bonds - requires a lot of energy to evapourate 1g of water
describe the structure of water.
dipolar - has two different charges, no overall charge
104.5’ bond angle
O is slightly - and has a higher affinity for electrons
H is slightly +
covalent bonds between H and O
What causes water molecules to stick together?
H bonds
Which is weaker H bonds or covalent bonds?
H bonds
What creates the surface tension of water?
downward facing H bonds
What is surface tension?
the water surface acts like a skin and is strong enough to support small organisms