week 1 Flashcards
electron orbitals are modeled as
energy levels
what is AMU?
atomic mass unit
atomic mass
porton +neuron
isotope
several different forms of an element each have same # of protons but different # of neutrons
what is AMU?
a designation of weight, is 1/6.02 x 10^23g
latent heat
amount of heat absorbed or released by a substance during a change in physical state
latent heat of vaporization
amount of heat absorbed to overcome the attractive forces between molecules
three ways molecules move
translational, rotational, vibrational
which phase of molecules have greatest translational motion
molecules in gas phase has greatest translational motion
molecule
2 or more atoms that are chemically joined together; smallest unit that retains the physical and chemical property of the substance.
compound
must have at least 2 different elements
molecular weight
sum of all atomic weights of all the elements of molecule or compound
gram molecular weight
expression of MW in terms of grams
how much space is one gram molecular volume?
22.4 L at STP, contains 6.02 x 10^23 molecules
Avogadro’s law
PV=nRT; same volume, pressure and temp, same # of molecules; At constant temp and pressure, number of volume and volume proportional.
specific gravity (sp gr)
weight of a unit volume of liquid or gas compared to a unit volume of H2O or dry air. If spgr is <1, it is less dense . E. G. helium makes air pass airway easier.
cohesion
interaction between LIKE molecules
adhesion
interaction between UNLIKE molecules
why isn’t water linear?
water not Linear B/c tetrahedral shape to maximize distance between electron pairs.
each water molecule is surrounded by how many neighboring H2Os?
Four
what causes h2o to have a high latent heat
strong intermolecular force so it can store more heat per unit volume and releases heat slowly.
use short terms to describe van der waals
momentary dipoles. weak, short range electrostatic attractive forces between UNCHARGED molecules.
