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- Rationalize the differences in physical properties in terms of intermolecular forces for the following organic compounds. Compare the first three substances with each other, compare the last three with each other, and then compare all six. Can you account for any anomalies? bp (C) mp (C) Hvap (kJ/mol) Benzene, C6H6 80 6 33.9 Naphthalene, C10H8 218 80 51.5 Carbon tetrachloride 76 -23 31.8 Acetone, CH3COCH3 56 -95 3.18 Acetic acid, CH3CO2H 118 17 39.7 Benzoic acid, C6H5CO2H 249 122 68.2Why is the C 60form of carbon called buckminsterfullerene?7. Electronegativity All about ammonia (NH3). Sb (antimony, atomic #51,) is in same Periodic Table column as N. The boiling point of SÜH3 (stibine, -17 °C) is slightly higher than NH3 (-33 °C). H 2.1 N 3.0 Sb 2.1 7a. What kinds of intermolecular interactions would occur in NH3 (1)? What kinds of intermolecular interactions would occur in SbH3 (1)? Is it surprising or expected that stibine would have a higher boiling point than ammonia? What could account for this higher boiling point?
- 3. Give the structure of the addition polymer (Teflon). [total 4 point] Br Br + BrNH3, NCI3, and NF3 are all polar. Here is a data table with some additional information: Melting Point Molecular Name Boiling Point (°C) (°C) Geometry Nitrogen trihydride -77.7 -33.3 Trigonal Pyramidal (ammonia) Nitrogen trichloride -40.0 71.0 Trigonal Pyramidal Nitrogen trifluoride -207 -129 Trigonal Pyramidal Considering intermolecular forces, for what reason would nitrogen trichloride have such a high boiling point?Consider the data in the table. Compound Melting point (°C) change in Hfus Boiling point (°C) Change in Hvap HF −83.11 4.577 19.54 25.18HCl −114.3 1.991 −84.9 17.53HBr −86.96 2.406 −67.0 19.27HI −50.91 2.871 −35.38 21.16 Determine the entropy change when 3.60 mol HCl(g) condenses at atmospheric pressure.Δ?=
- What specific aspects of polymer molecule structure (e.g., side group size, shape, polarity, and location) favor chain sliding?7. The polymer polystyrene can be drawn in its long form in the two ways shown below. Circle/highlight the repeating motif in this polymer. (See Question 13.3 on page 394 for an example of this type of problem.) H H H C -C ·C C fuluhun H H H H H H H C C H H H C6H5 C H H H C C C6H5 C6H5 H C6H5 C C6H5 H H C C C H H C6H5 H C -CH₂-CH-CH₂-CH-CH₂-CH-CH₂-CH-CH₂-CH-CH₂-CH-CH₂-CH-CH₂- H C6H52. Identify the strongest type of intermolecular force present in the following molecules List IMFS in order of increasing strength Molecule H2 CH;F NH2CH3 CH;OH
- Question 6 (1 point) H3C. CH₂ 1 OH OH 02 2 H3C ICH 3 OH HO NH 3 H3C CH3 CH3 4 Match the given structures to their proper descriptions. condensation monomer 1. Structure 1 addition monomer 2. structure 2 condensation polymer 3. structure 3 4. structure 4 addition polymertrue or false Br2 has a higher boiling point than Cl2.Explain what is Hexagonal Closest Packing?
