2.2 water Flashcards
structure of water
2 hydrogens that are positive with 1 oxygen that is negative.
hydrogen bonds
are attraction forces that happen between 2 atoms of 2 different molecules
what is cohesion
attraction between molecules of the same substance, like water droplets on the surface tension of a liquid is due to cohesion.
what is adhesion
attraction force between different molecules, like spreading of a liquid on a solid surface is due to adhesion.
what are the three thermal properties of water
high specific heat capacity, boiling temperature, latent heat of vaporization.
why is water a good solvent
because its polarity allows it to dissolve both ionic bonds and other polar molecules.
types of molecules water can dissolve
sugar, any hydrophilic proteins
types of molecules water can NOT dissolve
oils, fats, certain organic solvents because hydrophobic.
what is hydrophilic
like water, polar, have ionic compounds
what is hydrophobic
dont like water, non polar, covalent
water is…
polar and can form hydrogen bonds and has a high melting point
methane is…
non-polar and can only form weak dispersion forces between its molecules.
hydrophilic molecules
glucose, oxygen
hydrophobic molecules
amino acid, cholesterol, fats
