VSPER/Lewis Dot
what is the lewis for PO4^3-
show pic
how many electron pairs are shared between the carbon atoms in C2H4?
2
what is the molecular structure of SCN-, as predicted by VSPER?
linear
sigma bond
pi bond
single bond
double bond
triple bond
pi bond
Which of the following contains covalent bonds?
MgF2
NaCl
IBr
LiBr
Cu
IBr
What elements are octet violators?
B or Be
If the element has energy levels >3p
Which of the following molecules are diamagnetic?
N2^-
O2
F2
B2
Ne2
F2
Ne2
Which of the following displays the greatest ionic character in its bonds and give me some characteristics of being ionic
NO2
CO2
H2O
HF
NH3
HF
what is the equation for bond energy?
deltaHrxn = ΣBEbroken - ΣBEformed
What is the molecular structure for NH2Cl?
trigonal pyramidal
What is the trend for ionic radii?
cations are smaller
anions are larger
more energy levels = larger
atomic radii gets bigger with less valence
What is the correct electron configuration for C2? (list in terms of what is on the diagram in regards to pi and sigma)
σ1s^2 σ*1s^2 σ2s^2 σ*2s^2 π 2py^2 π 2px^2
When considering a container which holds a gas, and the ideal gas law, which of the statements is incorrect?
(a) When all other factors are held constant, the pressure is directly proportional to the temperature of the gas.
(b) When all other factors are held constant, the volume is inversely proportional to the number of moles of gas.
(c) When all other factors are held constant, the temperature is directly proportional to the volume of the gas.
(d) When all other factors are held constant, pressure is inversely proportional to the volume of the gas.
(e) When all other factors are held constant, the temperature is inversely proportional to the number of moles of gas.
B
Which bonding theory best explains the geometry of individual molecules from the number of electron groups surrounding the center atom?
1. molecular orbital theory
2. valence shell electron pair repulsion
3. valence bond theory
4. quantum theory of atoms in molecules
5. Brannigans Law
2. valence shell electron pair repulsion
How many resonance structures are possible for NO3^-?
3
How many central atoms are sp3 hybridized?
How many central atoms are sp2 hybridized?
2, 8
What is the bond order for BN^-?
2.5
The rate of effusion for H2 gas has been measured and found to be 55 mL/s. If the measurement is repeated with Xe, at the same temp and pressure, what will be the effusion rate for Xe?
Rate Xe = Rate H2 (sqrt(4/131.29)) = Rate H2 (sqrt(0.030466))
=15.0997
Which does not represent the formation of a sigma bond?
*show pic
D
The edge length is 12.3 angstroms, what is the radius in meters?
Volume of the unit?
6.15 A x 10^-10 = 6.15 x 10^-10 m
(12.3 x 10^-10)^3 = 1.86 x 10^-27
What are the bond angles present in trigonal by pyramidal geometry?
90, 120, 180
A 3.50g mass of pure solid is placed into an empty, sealed, 675 mL container, and it is heated until it becomes a gas. Once it has become a gas, at 249C, the pressure inside the container is 8.23 atm. What is the molecular mass of the solid?
27.0 g/mol
A balloon filled with 3.72 moles of nitrogen gas has a pressure of 1.42 atm at 23.5 C. The balloon expands as the temp of the gas inside the balloon increases to 47.0 C. If the final pressure of the gas inside the balloon is 1.52 atm, what is the volume of the balloon?
64.3 L
find delta H for 2H2 + O2 --> 2H2O
Bond / Bond Energy
H-H / 436
O=O / 499
O-H / 463
-481 kJ/mol
Assuming this unit cell is composed of one element and the edge length is 12.3 Angstroms, what is the radius in meters?
What is the volume of the unit?
diagonal = (12.3 x 10^-10m)sqrt2
diagonal = 2.0 x 10^-9 m
diagonal/4 = radius
4.35 x 10^-10
volume of the unit?
(12.3 x 10^-10)^3 = 1.86 x 10^-27