Chap 11 questions - Based on intermolecular interactions,...

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Based on intermolecular interactions, which of the following should have the highest boiling point? a. CH 4 b. CHCl 3 c. H 2 S d. CH 3 OH What is the typical range of strengths of hydrogen bonds? a. 5 - 25 kJ per mole of bonds b. 5 - 25 kJ per molecule c. 500 kJ per mole of bonds d. 1 - 2 kJ per mole of bonds e. less than all the above Hydrogen bonding is unimportant in a. ice formation b. the liquid properties of water c. DNA structure d. liquid CH 4 e. liquid HF Which one of the following statements is incorrect ? a. Dispersion (London) forces are the weakest type of intermolecular interactions. b. The strong intermolecular attractions in H 2 O result from hydrogen bonding. c. The boiling point of H 2 S is lower than H 2 O. d. The boiling point of non-polar substances tends to decrease with increasing molecular weight. How many atoms per unit cell are there in each of the following cubic lattice types? simple cubic body-centered cubic face-centered cubic (a) 8 6 12 (b) 1 2 4 (c) 1 2 6 (d) 6 8 14 Which of the species below does not exhibit hydrogen bonding? a. C 2 H 6 b. NH 3 c. HF d. H 2 O e. C 2 H 5 OH Which of the following phase diagrams is consistent with the sublimation of a solid at room temperature (22 o C) and atmospheric pressure?
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What type of attractive forces are being overcome when liquid oxygen boils at 90 K? a. ionic bonds b. dipole-dipole forces c. covalent bonds d. dispersion forces e. hydrogen bonds What is the coordination number of each sphere in a three dimensional body-centered cubic array of equal-sized spheres? a. 4 b. 6 c. 8 d. 12 e. 16 Covalent bonds are the only type of bond or intermolecular forces in: a. KF(s). b. CO 2 (s). c. H 2 O(s). d. NH 4 NO 2 (s). e. C(diamond). The density of silver is 10.5 g/cm 3 and this metal crystallizes in the FCC structure. Assuming that nearest neighbor atoms are in contact, what is the atomic radius of Ag? a. 5.76 Angstroms b. 2.88 Angstroms c. 2.29 Angstroms d. 1.44 Angstroms e. 1.02 Angstroms A white substance melts with some decomposition at 730 o C. As a solid, it is a nonconductor of electricity but it dissolves in water to form a conducting solution. The white substance is: a. a covalent network solid.
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b. an ionic solid. c. a molecular solid.
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This note was uploaded on 02/05/2012 for the course CHEM 115 taught by Professor L during the Fall '02 term at Purdue University-West Lafayette.

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Chap 11 questions - Based on intermolecular interactions,...

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