Chem 2 exam I
Most shape between atoms, most freedom, highly compressible, assume shape & volume of container?
incompressible, assume shape but not volume of container. molecules/atoms can not pass one another
has a definite shape and volume, only movement is vibrational
what are the two types of solids?
what is a crystaline solid?
atoms or molecules are arranged in well ordered 3D structure.
What is an amorphus solid like?
atoms or molecules have no organization
what happens when a gas goes to a liquid?
molecules move closer together.
How do you change a gas to a liquid?
increase the pressure or cool therefore making the molecules move closer together
what happens when a liquid goes to a gas?
requires the molecules to move farther apart
how do you change a liquid to a gas?
decrease the pressure or heat thus moving the molecules farther apart
what are intermolecular forces?
attraction between atoms or molecules with in a substance.
intermolecular forces are stronger or weaker then ionic or covalent bonds?
what do phase changes involve?
breaking and forming intermolecular forces
when a substance is at its melting or boiling point what is occuring?
its going from more order to less, forces are being broken.
Intermolecular forces from weakest to greatest?
-london dispersion forces
what are london dispersion forces?
-weakest of all intermolecular forces
-occurs in all substances
Chem 2 exam I