Which of the following has bond angles slightly less than 120 degrees? ClF3, NO2, CHCl3, BH3
NO2
100
What types of intermolecular forces does CHCl3 exhibit?
London, dipole-dipole
100
Determine which of these compounds is paramagnetic and diamagnetic.
B2, Li2, N2 2+, He2 2-
B2-para, the rest are dia
100
If a gas occupies a volume of 35 cm3 at a pressure of 900 mmHg and a temperature of 120 degrees Celsius, what would be the new volume if the pressure was increased to 1157 mmHg and the temperature was dropped 50 degrees?
24 mL
100
What class of solid is KNO3?
ionic
200
Which of the following does not have a delocalized bond?
XeO4, NO2, O3, CO3 2-
XeO4
200
What types of forces hold water in its solid configuration (ice)?
London, dipole-dipole, hydrogen
200
Give the bond orders of the following:
O2 -, C2 +, He2 -, Li2 -
1.5, 1.5, 0.5, 0.5
200
A gas at STP occupies a volume of 275 mL and has a mass of 6.4 grams. What is the molecular weight?
520.33 g/mol
200
Rank the following in order of decreasing IMF:
NO2, He, F2, CH4, NHF2
NHF2>NO2>F2>CH4>He
300
How many regions of electron density and how many bonded electrons are from the central atom in I3 -? Also, what is the electronic geometry and molecular geometry?
5 electron rich regions, 2 bonded electrons, trigonal bipyramidal, linear
300
Which of the following is not polar?
PH3, SF4, ICl2 -, POCl3
ICl2-
300
Rank the following in terms of decreasing bond length:
N2 +, C2 2-, F2, B2 -
F2>B2 ->N2 +>C2 2-
300
CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)
Assuming the reaction goes to completion, if 7 grams of O2 is initially in and the final volume is 2 L at standard temperature, what is the pressure?
3.68 atm
300
Which physical property of water explains a leaf floating on the top?
surface tension
400
What molecular geometries can stem from trigonal bipyramidal?
trigonal bipyramidal, linear, see-saw, t-shape
400
Rank the bonds from most to least polar. NCCH2OH, 1 between C-N, 2 between C-C, 3 between C-H, 4 between C-O, 5 between O-H
5>4>1>3>2
400
The dsp3 hybridization has what percent s character, what percent p character, and what percent d character?
s-20%, p-60%, d-20%
400
Which of these molecules would have the largest a term and b term in the van der waals equation?
CHCl3, CO2, POCl3, CH4, H2O
a-H2O, b-POCl3
400
Rank the following in order of decreasing vapor pressure:
CH2O, N2, CHCl3, Ar, NH3
N2>Ar>CH2O>CHCl3>NH3
500
Draw C8H8 and determine the number of sigma and pi bonds.
16 sigma, 4 pi
500
Draw two NH3 molecules in the likely orientation that the intermolecular forces will allow.
hydrogen bonding
500
Draw the structure of CH2O and for each bond determine the type of bond and where the electrons come from.
sigma(1s-sp2) between the C and H, sigma(sp2-sp2) between the C and O, pi(2p-2p) between the C and O.
500
What is the rate of effusion of H2 compared to methane gas (CH4)?
H2 effuses sqrt(1/8) as fast as CH4 or CH4 effuses sqrt(8) as fast as H2
500
Rank the following in order of decreasing viscosity:
CH3OH, CH2O, H2O, CH3OCH2CHO, CH3OCH2CH2OH