CHEM 1031 Flashcards
Miniscibility?
Like dissolves like
Polar molecules are miscible in polar molecules
Non-polar molecules are miscible in non-polar molecules
Bond angles in linear molecules?
180 degrees
Bond angles in trigonal planar molecules?
120 degrees
Bond angles in tetrahedral molecules?
109.5 degrees
Bond angles in trigonal bipyramidal molecules?
90/120 degrees (depending)
Bond angles in octahedral molecules?
90 degrees
What is n in terms of atomic structure?
- principal quantum no.
- determines ENERGY for H-atom
- any positive integer
- as n increases, electrons will have increasingly higher energies and are less tightly bound to the atom than electrons with lower values of n
What is l in terms of atomic structure?
angular quantum no.
determines SHAPE of orbital
- n-1 (has to be positive)
- “s” = an electron distribution (orbital) with l = 0
- “p” = an electron distribution (orbital) with l = 1
- “d” = an electron distribution (orbital) with l = 2
What is m(l) in terms of atomic structure?
- magnetic quantum no.
- determines DIRECTION of orbital
- l…0 + l
What is m(s) in terms of atomic structure?
- SPIN quantum no.
- determines spin of electron
- -/+1/2
What does paramagnetic mean?
- an atom, ion, or compound that has at least one unpaired electron
- attracted to magnetic fields
What does diamagnetic mean?
- an atom, ion, or compound that has no unpaired electrons
- repel magnetic fields.
To create a dipole-dipole bond intermolecularly…?
Both molecules must be polar.
To create a hydrogen bond intermolecularly…?
Hydrogen bonding requires a hydrogen atom attached to either a nitrogen, oxygen or fluorine atom on one molecule to interact with a lone electron pair on either a nitrogen, oxygen or fluorine atom on another molecule.
Shape vs geometry?
Shape excludes lone pairs, geometry includes them.
