1. Place the following substances in order of decreasing boiling point. (4 %) CH
ID: 905783 • Letter: 1
Question
1. Place the following substances in order of decreasing boiling point. (4 %)
CH4CH3Cl HBr NaNO3 HOCH2CH2OH
Place the following compounds in order of decreasing strength of intermolecular forces. (4 %)
NO2 He N2 NH2CH3
Place the following substances in order of increasing boiling point at a given temperature. (4 %)
NH3 O2 CO CaO
Place the following substances in order of decreasing vapor pressure at a given temperature. (4 %)
F2 LiBr CF4 CH4CH2Cl2
1. Place the following substances in order of decreasing boiling point. (3 %)
Ne Cl2 O2
Place the following compounds in order of decreasing strength of intermolecular forces. (4 %)
CH4 NH3 CH3CH2CH3 CH3CH3
Place the following substances in order of decreasing vapor pressure at a given temperature. (3 %)
BeF2 CH3OH CH4
Assign appropriate phase transitions for each arrow (4 %)
3. (18 %) Complete the following table
Lewis dot Structure
(2 % each)
Electron Domain Geometry (1%)
Molecular Geometry
(1%)
Hybridization of the central Atom
(2 %)
BF3
SO32
SnCl3–
A solution containing 10.0 g of an unknown liquid and 90.0 g water has a freezing point of -3.33 °C. Given = 1.86°C/m for water. Calculate the molar mass of the unknown liquid. (6 %)
5. Consider the solution containing 16.5 g of K2SO4 dissolved in 640 g of water. The solution has density of 1.25 g/mL. Calculate: (4 % each)
a) the mass percentage of K2SO4
b) the mole fraction of H2O
c) the molarity of this solution
d) the molality of this solution
Determine the freezing point of a solution that contains 50.0 g of C6H5CH3 dissolved in 355 g of water. Pure water has a freezing point of 0.00 0C and freezing point depression constant of 1.860C/m. (10 %)
6. (4 % each)
a) Write the condensed (or abbreviated) electron configuration for the Sc2+ ion.
b) Write the complete electron configuration for a V (vanadium) atom.
c) Using the orbital diagram method (boxes and arrows), write the complete electron configuration for an element with 15 electrons.
7. (3 % each) For the following problems use commas when separating, do not use sign < or >
a) Place the following elements in order of increasing radius.
N Ne Mo
b) Place the following in order of decreasing radius.
Se 2 Br I
c) Place the following in order of increasing IE1.
B Sr F
d) Place the following in order of increasing metallic character.
Ge Si Rb
e) Place the following in order of increasing radius .
O2 Na1+ N3
Lewis dot Structure
(2 % each)
Electron Domain Geometry (1%)
Molecular Geometry
(1%)
Hybridization of the central Atom
(2 %)
BF3
SO32
SnCl3–
Explanation / Answer
1) Decreasing boiling point
Highest : NaNO3 ( ionic solid)
Next : HOCH2CH2OH ( hydrogen bond)
Next : HBr ( more london forces)
Next : CH4CH3Cl
NaNO3 > HOCH2CH2OH > HBr >CH4CH3Cl
2) The order will be
NO2 > NH2CH3 > N2 > He
3) Increasing boiling point
CaO (solid) > NH3 > Co > O2
4)
Place the following substances in order of decreasing vapor pressure at a given temperature.
F2 > CH4CH2Cl2 > CF4 > LiBr
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