MCAT CHEM 1
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atomic emission spectrum?
unique spectrum of light when an atom's electron falls to their ground states
atomic absorption spectrum?
spectrum of light absorbed when electrons are excited to higher energy level
equation for maximum number electron in a shell?
what does azimuthal (2nd) quantum number (l) represent
what does magnetic (3rd) quantum number represent
orbital, possible value from -l to l
how many orbitals can each subshell accommodate
- s: 0 -----1
- p: -1,0,1 ------3
- d: -2,-1,0,1,2 ------5
- f : -3,-2,-1,0,1,2,3 ------7
how many 4th quantum number (ms) are possible for an electron? what are they?
2... they are -1/2, +1/2
has unpaired electrons
has no unpaired electrons
what is the valence config for an element in each of the following groups
what is ionization energy (IE)
energy required to completely remove an electron from an atom
compare the values of the first and second ionization energy of an atom
second always higher than the first
what is electron affinity
energy released when an atom accepts an electron
what is electronegativity
a measure of the attraction an atom has for electrons in a chemical bond
characteristics of ionic compounds
form crystal lattice, conduct electricity in solution, have high melting and boiling points
what types of bond forms btwn atoms with small differences in electronegativity (.4 - 1.7)
coordinated covalent bond
bond in which a pair of electron originates from just one of the atoms
3 steps for determining geometric configuration
- 1.draw Lewis structure of the molecule
- 2.count the bonding and non bonding electron pairs in the valence shell of the central atom
- 3.arrange the electron pairs around the central atom so that they are as far apart as possible
3 types of intermolecular forces
- hydrogen bonding
- dispersion forces
formula for gram equivalent weight
gram equivalent weight=molar mass/ n
formula for calculating equivalents?
equivalents=weight of compound/ gram equivalent weight
simplest whole number ration of the elements present in a compound
formula for calculating percent composition
mass of X in compound/ molecular weight of compound x100%
Zn(s) + CuSO4(aq)-->Cu(s) +ZnSO4 (aq)
1.total ionic equation
2.net ionic equation
- 1.Zn (s) + Cu2+ (aq) +SO42- (aq) ---> Cu (s) + Zn2+(aq) +SO42-(aq)
- 2.Zn (s) + Cu2+(aq)--->Cu (s) +Zn2+(aq)
rxn that cant be decomposed into other rxn
general formula for the rate law of
what is enthalpy change of a rxn (delta H)
the difference btwn potential energy of the products and the potential energy of the reactants.
equilibrium constant for
does Keq for a rxn consistent for all temp?
no, it's specific for a given temp
if there is much more product than reactant at equilibrium, what can be said of Keq?
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