hw 6 - shah(rps587 Homework 6 mcdevitt(52365 This print-out...

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shah (rps587) – Homework 6 – mcdevitt – (52365) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points In general, decreasing the temperature makes which phase transitions more likely to occur? 1. evaporation, fusion, sublimation 2. evaporation, deposition, freezing 3. sublimation, condensation, freezing 4. condensation, fusion, deposition 5. condensation, freezing, deposition cor- rect Explanation: Phase changes are equilibrium processes and are thus temperature dependent. Also, the ΔH and ΔS always have the same sign. Lowering the temperature makes exothermic phase transitions more likely - freezing, con- densation and deposition. 002 10.0 points Which state of matter is characterized by having molecules far apart and moving ran- domly? 1. liquid 2. All of these 3. solid 4. gas correct Explanation: 003 10.0 points The degree of order of matter is directly pro- portional to the cohesive forces that hold the matter together. In other words, the more or- ganized the state of matter, the stronger is the glue that holds it together. Which one of the following ranks these cohesive forces from the state with the strongest to that with the weakest cohesive forces? 1. solid = gas = liquid 2. solid > liquid > gas correct 3. gas > liquid > solid 4. liquid > solid > gas Explanation: Running through air is easier than running through water, which is easier than running through a brick wall. 004 10.0 points Which of the following is NOT a characteristic of a hydrogen bond? 1. It is stronger than other dipole-dipole interactions. 2. It can occur when hydrogen is covalently bound to very electronegative elements liks F, Cl, Br and I. correct 3. It is weaker than a covalent bond. 4. It is responsible for the unusual physical properties of water. Explanation: Hydrogen bonding only occurs when hydro- gen is covalently bonded to very electronega- tive elements like O, N or F. 005 10.0 points For which of the molecules A) CO 2 B) O 2 C) SO 2 D) O 3 will dipole-dipole interactions be important? 1. All have dipole-dipole interactions. 2. Another combination of compounds 3. None has dipole-dipole interactions. 4. A and D only 5. C and D only correct 6. A and C only
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shah (rps587) – Homework 6 – mcdevitt – (52365) 2 7. A and B only 8. B and D only 9. B and C only Explanation: O 2 and CO 2 do not have dipole moments.
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