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Chemistry Exam 3: Solutions and Intermolecular Forces, Exams of Inorganic Chemistry

The third exam for the chemistry 1b course, focusing on solutions and intermolecular forces. Students are required to calculate densities of metals and salts, identify intermolecular interactions and rank their strengths, determine volatility orders, and predict solubilities. Additionally, they must use given data to calculate enthalpy of vaporization and normal boiling points, construct a phase diagram, and identify the state of a compound at a specific temperature and pressure.

Typology: Exams

Pre 2010

Uploaded on 08/16/2009

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Exam 3 CHEMISTRY 1B Ch 13 100 Points
Name______________________________
SHOW YOUR WORK FOR FULL CREDIT!!!!
1. Copper metal crystallizes in a face-centered cubic structure. The radius of the copper atom is 127.8
pm. Calculate the density of the metal in g/cm3. (10)
2. Thallium chloride, TlCl, has a unit cell that is simple cubic in chloride ions with the thallium ions in
the body hole. The thallium ion has a radius of 153 pm and the chloride ion has a radius of 181 pm.
Calculate the density of this salt in g/cm3. (15)
3. For the following (1) Identify the type of interaction between the following pairs and (2) rank each
pair, in a vertical-fashion, placing the ion/molecule with the strongest intermolecular interaction on top
of the weaker intermolecular ion/molecule (of course if they are the same place them horizontally) (25)
1. Ca+2, H2O
2. H2O, NH3
3. Sr+2, F-
4. CH2F2, O2
5. Kr, Xe
6. H2O, H2O
7. Tl+3, O-2
8. K+, I-
9. Cs+, H2O
10. CH3F, CHF3
11. Ne , CH4
12. Ga+3, H2O
4. Rank from the highest volatility (left) to the lowest volatility (right). (10)
SrO, HCl, Ar, H2O, LiI, CH3CH2CH2CH2CH3
5. Predict and explain the solubility of (i.e. very soluble or slightly soluble): (10)
a. Br2(l) in C7H16(l)
b. CH3CH2OCH2CH3(l) in CH3CH2OH(l)
6. Use the data below to calculate the 1. enthalpy of vaporization and the 2. normal boiling point for
CS2.
8.314 J
R
K mol
(10)
Temperature, Vapor Pressure
50.0C 855 torr
20.0C 295 torr
7. Construct a phase diagram for compound "X" using the data below: (20)
Triple Point 283 K and 0.50 atm
Critical Temperature 325 K
Normal Freezing Point 291 K
Normal Boiling Point 301 K
Critical Pressure 2.25 atm
Label the solid, liquid, gas, and super-critical fluid phases by area.
Label the fusion line as F, the sublimation line as S, and the vaporization line as V.
Which state is more dense, the liquid or the solid?
Which state exists at 295 K and 2.8 atm?
1

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Exam 3 CHEMISTRY 1B Ch 13 100 Points Name______________________________ SHOW YOUR WORK FOR FULL CREDIT!!!!

  1. Copper metal crystallizes in a face-centered cubic structure. The radius of the copper atom is 127. pm. Calculate the density of the metal in g/cm^3. (10)
  2. Thallium chloride, TlCl, has a unit cell that is simple cubic in chloride ions with the thallium ions in the body hole. The thallium ion has a radius of 153 pm and the chloride ion has a radius of 181 pm. Calculate the density of this salt in g/cm^3. (15)
  3. For the following (1) Identify the type of interaction between the following pairs and (2) rank each pair, in a vertical-fashion, placing the ion/molecule with the strongest intermolecular interaction on top of the weaker intermolecular ion/molecule (of course if they are the same place them horizontally) (25)
  4. Ca+2, H 2 O
  5. H 2 O, NH 3
  6. Sr+2, F-
  7. CH 2 F 2 , O 2
    1. Kr, Xe
    2. H 2 O, H 2 O
    3. Tl+3, O-
    4. K+, I-
      1. Cs+, H 2 O
      2. CH 3 F, CHF 3
      3. Ne , CH 4
      4. Ga+3, H 2 O
  8. Rank from the highest volatility (left) to the lowest volatility (right). (10) SrO, HCl, Ar, H 2 O, LiI, CH 3 CH 2 CH 2 CH 2 CH 3
  9. Predict and explain the solubility of (i.e. very soluble or slightly soluble): (10) a. Br 2 (l) in C 7 H 16 (l) b. CH 3 CH 2 OCH 2 CH 3 (l) in CH 3 CH 2 OH(l)
  10. Use the data below to calculate the 1. enthalpy of vaporization and the 2. normal boiling point for CS 2. 8.^

J

R

K mol

Temperature, Vapor Pressure 50.0C 855 torr 20.0C 295 torr

  1. Construct a phase diagram for compound "X" using the data below: (20) Triple Point 283 K and 0.50 atm Critical Temperature 325 K Normal Freezing Point 291 K Normal Boiling Point 301 K Critical Pressure 2.25 atm  Label the solid, liquid, gas, and super-critical fluid phases by area.  Label the fusion line as F, the sublimation line as S, and the vaporization line as V.  Which state is more dense, the liquid or the solid?  Which state exists at 295 K and 2.8 atm? 1