Water properties. Flashcards
What type of bonds are in a water molecule?
Covalent.
Polarity.
Water is polar because has 2 delta plus H and 1 delta minus O.
Adhesion definition.
Attraction between water and non-water molecules/ ability to form H bonds between H2O and other molecules.
Cohesion definition.
Attraction between water molecules. H bonds between H2O molecules.
Importance of high specific heat capacity.
-Prevents large fluctuations in temp
-Keeps aquatic habitats stable
-Allows enzymes to work in cells efficiently.
High specific heat capacity definition.
A large amount of energy is needed to raise its temperature.
Water high specific heat capacity explanation.
–H bonds between water molecules restrict movement
-Resists increase in kinetic energy
-Resists increase in temp.
Latent heat of vaporisation definition.
Lots of heat energy needed to change from liquid to a vapour.
Importance of high latent heat of vaporisation.
-Temp control with sweat to vaporise water from sweat or leafs surface
-As evaporates, body cools.
High latent heat of vaporisation explanation.
-H bonds must be broken for molecules to fly off as gas
-Higher temp needed to provide energy to break bonds.
High surface tension meaning, importance and explanation.
-Strong H bonds between dipoles resist stretching/breaking surface.
-Pond skaters can be supported on water.
-Water can be pulled through plants.
Importance as a solvent.
-Dipoles attract ions and other polar molecules.
-Dissolve in water so chem reactions can take place and transport.
-In xylem, plasma.
-Does not dissolve non-polar substances.
Processes where water is a metabolite.
-Reactant in photosynthesis and hydrolysis.
-Product of aerobic respiration and condensation.
Importance in natural habitats.
-Buoyancy/ice less dense than water=home for animals/insulates aquatic habitats.
-Transparent=light can pass through to aquatic plants for photosynthesis.
