water Flashcards
describe the structure of water
one atom of oxygen chemically bonded to two atoms of hydrogen
what kind of bonds are there between the oxygen and hydrogen atoms in water
covalent
what kind of charge do oxygen atoms have with water
SLIGHTLY negative
what kind of charge do hydrogen atoms have
SLIGHTLY positive
what do these charges mean
water is a polar molecule
why does water have hydrogen bonds
the forces of attraction between the slightly positive hydrogen and slightly negative oxygen
describe and explain what the specific heat capacity of water is like
very high so requires high amounts of energy to heat water
when heated energy goes to breaking hydrogen bonds in opposed to gaining kinetic energy
water acts as a buffer against rapid temp changes ( cant change rapidly)
describe and explain the latent heat vaporisation of water
takes a high amount of heat energy to evaporate it
eg sweating
describe and explain waters role as a solvent
lots of substances can dissolve in water
eg dissolved oxygen in rivers for fish
what is adhesion
when water molecules stick to other surfaces
describe the cohesion of water
water molecules stick together
they pull each other together
what does cohesion cause
surface tension
what does surface tension do
act like a skin for water
what is an example of a reaction water is involved in
condensation reactions and photosynthesis
