Homework 8-solutions - panjwani(rp26545 Homework 8 sutclie(51345 This print-out should have 21 questions Multiple-choice questions may continue on the

Homework 8-solutions - panjwani(rp26545 Homework 8...

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panjwani (rp26545) – Homework 8 – sutcliffe – (51345) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points Rank the gases H 2 , CH 3 F, N 2 , CF 4 , HF from left to right in terms of the increased non-ideality that results from a reduction in the effective pressure of the gas due to inter- molecular forces. 1. H 2 , CH 3 F , N 2 , CF 4 , HF 2. CF 4 , CH 3 F , N 2 , HF , H 2 3. H 2 , N 2 , HF , CH 3 F , CF 4 4. H 2 , HF , N 2 , CH 3 F , CF 4 5. H 2 , N 2 , CF 4 , CH 3 F , HF correct 6. HF , CH 3 F , CF 4 , N 2 , H 2 Explanation: The stronger the intermolecular forces present, the greater the non-ideality. Induced Dipole H 2 smallest , most ideal N 2 CF 4 largest Dipole - dipole CH 3 F Hydrogen Bonding HF least ideal 002 10.0points Whattypesofintermolecularinteractionsdoes ammonia (NH3) exhibit? I) instantaneous dipole or van der WaalsII) dipole-dipoleIII) hydrogen bondingIV) covalent bonding 4. II and IV only 5. I, II, and III only correct 6. II and III only Explanation: All molecules, because they have elec- tron clouds, experience instantaneous dipoles. NH 3 is polar and thus experiences dipole-dipole interactions. NH 3 contains N H bonds and therefore experiences hy- drogen bonding interactions. Covalent bond- ing is an intramolecular interaction. 003 10.0points Dispersion (London) forces result from 1. the balance of attractive and repulsive forces between two polar molecules. 2. the formation of a loose covalent link- age between a hydrogen atom connected to a very electronegative atom in one molecule and another very electronegative atom in a neighboring molecule. 3. attraction between molecules in a liquid and molecules or atoms in a solid surface with which the liquid is in contact. 4. distortion of the electron cloud of an atom or molecule by the presence of nearby atoms or molecules. correct 5. attractive forces between a molecule at the surface of a liquid and those beneath it which are not balanced by corresponding forces from above. Explanation: 004 10.0points Which of the following can form intermolecu-lar hydrogen bonds?
panjwani (rp26545) – Homework 8 – sutcliffe – (51345) 005 10.0points Which response includes all of the following substances I) Cl 2 II) HF III) Ne IV) KNO 2 V) CCl 4

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