water Flashcards
water has a low viscosity what does this mean
water can flow easily
what are the abilities of water when it is at room temperature
habitat for aquatic organisms
component of tissues
provide a reaction medium
provide transport medium- blood
when water becomes colder, does water become more or less dense
more dense
what temperature causes water molecules to align themselves into ice
4 degress
is ice more or less dense than water
less
what are the advantages of ice being less dense than water
ice floats on top of water and insulates it reducing heat loss
stable environment for aquatic organisms throughout winter
what are the advantages of water being a good solvent
molecules can move around water and react
molecules and ions can be transported around living things
what is cohesion
hydrogen bonding between water molecules can pull them together.
how is surface tension created in water
enabled by cohesion
due to hydrogen bonding, the surface of the water has ability to resist force and create a sort of “film”.
what are the advantages of cohesion and surface tension
water in plant vascular tissue are pulled up xylem from root
insets can walk on water
e.g. pondskaters.
water has a high specific heat capacity, what does this mean
the amount of energy needed to heat a body of water
what is the specific heat capacity og water
4.2kj of energy to raise 1kg of water
there is a lot of energy needed to heat water why is this advantageous
allows stable temperature environment for enzyme controlled reactions to happens properly
aquatic organisms need stable environment
what bonds allow cohesion to occur
hydrogen bonds between water molecules allow cohesion between water molecules
what does cohesion allow
allows water to move through xylem and through blood vessels
what is high latent heat of vaporisation
the energy requires to break hydrogen bonds in water and cause it to become a gas
what are the advantages of latent heat of vaporisation
cools organisms down, by turning liquid into a gas- keeps temperature stable.
e.g. sweat evaporating
Water is a reactant, what does this mean
it is used in chemical reactions such as photosynthesis
