Ch 7/8
Bonding & Geometry
Bonding & Geometry
What is the hybridization of SO2?
sp2
What are the three types of intermolecular forces in order of increasing strength?
Dispersion forces, dipole-dipole, hydrogen bonding
Which of the following is a strong electrolyte?
1. NH3
2. HCl
3. C6H12O6
4. CH3OH
2. HCl
What is Cl- in the following two-step reaction?
Step 1:
Cl- + CH4 → CH3- + HCl
Step 2:
CH3- + Cl2 → CH3Cl + Cl-
Cl- is a catalyst
Is the following molecule polar or nonpolar: NH3
Polar
Which of the following cannot hydrogen bond?
1. CH3CH3OH
2. N(CH3)3
3. CH3NH2
4. H2O
2. N(CH3)3
What are the four colligative properties?
Vapor pressure lowering, Boiling point elevation, Freezing point depression, Osmotic pressure
At a certain point in the following reaction, the rate of disappearance of NO is measured to be 0.060M/s. What is the rate of disappearance of O2 at the same moment?
2NO + O2 → 2NO2
0.030 M/s
What is the VSPER geometry and bond angles for H2O?
Bent, <<109
What is the formula for calculating heat energy required by a substance to change its phase?
q = nΔH
Which of the following solutions has the lowest freezing point:
1. 0.20m NaCl
2. 0.10m CaCl2
3. 0.20m C6H12O6
4. 0.075m AlCl3
1. 0.20m NaCl
What is the rate for the first order reaction A → Products when [A] = 0.236M? (k = 0.360min-1)
0.085 M/min
What does electronegativity have to do with polarity?
The more electronegative atom creates a dipole, and dipoles are combined to create an overall dipole moment to determine if the molecule is polar or nonpolar.
I want to melt 0.75mol of solid benzene (C6H6) at its melting point (5.5°C). What is the number of kJ of heat required to completely melt the benzene?
ΔHfus = 9.87kJ/mol
q = 7.4025 kJ
What is the new boiling point of a solution made by dissolving 20g of sodium chloride (NaCl) in 500g of water?
Kb = 0.512 °C*kg/mol
The normal boiling point of pure water is 100°C.
MM of NaCl = 58.44 g/mol
100.7 °C
Consider the following rate law for a reaction: rate = k[A]2. If the rate constant for this reaction is 0.135 M-1 min-1, how much time (in minutes) does it take for the concentration of A to decrease from 0.375M to 0.158M?
27.1 minutes, using second-order integrated rate law
Describe the octahedral molecular arrangement-- include number of groups, lone pairs, bond angles, and hybridization.
6 groups, 0 lone pairs, 90 bond angle, sp3d2
Liquid butane is used in cigarette lighters. The boiling point of butane at 1 atm is -1.0°C, and its ΔHvap is 22.44 kJ/mol. Calculate the pressure (in atm) of the butane in the lighter at 20.5°C. (R=8.314 J/mol*K)
2.07 atm
At a particular temperature, the solubility of CO2 in water is 0.13M when the partial pressure is 1.5atm. What partial pressure (in atm) of CO2 would give a solubility of 0.080M?
0.923 atm, using Henry's law
The activation energy for a particular reaction is 102 kJ/mol. If the rate constant is 1.35 x 10-4 s-1 at 308K, what is the rate constant at 273K?
8.18 x 10-7, using Arrhenius equation