Shared Flashcard Set

Details

MCAT Chemistry
cards for chemistry
49
Chemistry
Undergraduate 4
06/21/2009

Additional Chemistry Flashcards

 


 

Cards

Term
atomic mass units
Definition
amu or g/mol
Term
g/amu
Definition
mol
Term
metals form ___ oxides
Definition
ionic
Term
nonmetals form ___ oxides
Definition
covalent
Term
groups left to right periodic table
Definition
alkali, alkaline earth, halogen, noble gases
Term
Zeff/ Effective nuclear charge
Definition
charge felt by 2nd electron d/t shielding from 1st e-
Term
Zeff trend
Definition
increases → & ↓
Term
Atomic radius trend
Definition
increases ↓
Term
ionization energy
Definition
energy required to pull off one electron from nucleus
Term
Ionization energy trend
Definition
increases → (d/t increasing Zeff) & (d/t larger radius @ bottom of periodic table)
Term
Electronegativity def.
Definition
Tendency to attract e-
Term
Electronegativity trend
Definition
increases → & ↑ (like ionization E)
Term
Which periodic table properties increases → & ↑
Definition
E of Ionization, Electron Affinity, Electronegativity
Term
Which periodic table properties decreases from → & ↑
Definition
Atomic radius, Metallic character
Term
Empirical formula represents
Definition
Ratio of atoms
Term
molecular formula represents
Definition
actual # of each atom
Term
-ic vs. -ous
Definition
more vs. less (charge or oxygen)
Term
Naming cations
Definition
-ic & -ous (less) OR -ium (nonmetal component)
Term
Naming anions
Definition
hypo-/ite & -ite, -ate, per-/ate (fewest O to mst)
Term
Naming acids
Definition
hydro- & -ic; if have O, no hydro- & use -ic or -ous depending on fewer or more O
Term
ionic crystal
Definition
opposite charged held by electrostatic forces
Term
metallic crystal
Definition
metal atoms bond together by flowing e-
Term
network covalent crystal
Definition
e.g. diamonds. Atoms held by polar & nonpolar bonds
Term
molecular crystal
Definition
e.g. ice. Molecules held by intermolecular bonds
Term
Planck equation
Definition
ΔE=hf
Term
Chart for orbitals
Definition
[image]
Term
e- absorbs energy then moves...
Definition
to higher shell
Term
e- emits energy when moves...
Definition
to lower shell
Term
# e- in each shell
Definition
s=2; p=6; d=10
Term
degenerate orbitals
Definition
4s & 3d in Cr & Cu & some other txstn metals
Term
ideal gas law
Definition

PV=nRT

P-> pressure (atm)

V-> Volume (L)

n-> # mols of gas

R-> constant

T-> Temp (K)

Term
Partial Pressure equation
Definition

Pa = XaPtotal

Partial press. of gas in mixture= mol fraction  (mols of gas a / total mols of gas) of that gas times total press.

Term
Total Press. Equation
Definition
Ptotal = P1 +P2+P3
Term
Average translational KE
Definition
K.E.avg = 3/2RT
Term
For ideal gas, std. properties are:
Definition
1 atm, 22.4 L, 1 mol, 0° C (273° K)
Term
When press. increases, K.E. ...
Definition
increases
Term
Graham's law (ratio of rms velocities)
Definition
v1/v2 = √m2/√m1
Term
Effusion def.
Definition
Gas spreads from high to low press. thru pinhole
Term
Effusion equation
Definition
effusion rate1/effusion rate2= √m2/√m1
Term
Deviations in ideal behavior occurs when...
Definition
V decreases (PV=nRT t/f V decreases if P increase or T decreases)
Term
Real gas to ideal gas volume
Definition
Vreal > Videal (b/c ideal gas dsn't have volume)
Term
Real gas pressure to ideal gas pressure
Definition
Preal < Pideal (b/c intermolecular attractive forces stronger t/f slows b/f hit wall)
Term
Density
Definition
D = m/v
Term
Rate Law
Definition
rateforward = kf [A]α[B]β
Term
1st Order rxn
Definition

A→products

  • rate=kf[A]
  • [A] decreases exponentially
  • slope= -kf
  • half-life constant
Term
2nd Order Rxn
Definition

2A→products

  • rate= kf[A]2
  • each half-life longer than previous
Term
Law of mass action
Definition

K= [C]c[D]d/ [A]a[B]b = Productscoefficients/Rxtntscoefficients

Term
K =? vs. k=?
Definition
Equilibrium constant (measured in activity) vs. Rate constant
Term
Rxn Quotient
Definition

Q = Productscoeffcients/Rxtntscoefficients

  • For non=equilibrium conditions
  • used to predict direction of rxn
Supporting users have an ad free experience!