HW9S - Gauthier, Joseph Homework 9 Due: Nov 6 2007,...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Gauthier, Joseph Homework 9 Due: Nov 6 2007, midnight Inst: Vandenbout 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. Room Assignments for EXAM 2 A-K WEL 1.316 L-O WEL 2.122 P-Z WEL 1.308 001 (part 1 of 1) 10 points Identify the kinds of intermolecular forces that might arise between molecules of trans- CHCl CHCl. 1. dipole-dipole 2. None of these 3. London forces, dipole-dipole, hydrogen bonding 4. London forces, dipole-dipole 5. London forces correct 6. hydrogen bonding Explanation: C H Cl C H Cl is non-polar. 002 (part 1 of 2) 10 points Calculate the ratio of the potential energies for the interaction of a water molecule with an Al 3+ ion (of radius 53 pm) and with a Be 2+ ion (of radius 27 pm). 1. . 39 correct 2. 0.24 3. 0.52 4. 0.76 5. None of these 6. 0.63 Explanation: r Al = 53 pm r Be = 27 pm The energy E p -| z | r 2 , so the ratio is E Al E Be = | z Al | r 2 Be | z Be | r 2 Al = | 3 | (27 pm) 2 | 2 | (53 pm) 2 = 0 . 389284 003 (part 2 of 2) 10 points Which ion will attract a water molecule more strongly? 1. Al 3+ 2. Equal attraction 3. Be 2+ correct Explanation: The attraction of the Be 2+ ion will be greater than that of the Al 3+ ion. Even though the Be 2+ ion has a lower charge, its radius is much smaller than that of Al 3+ , making the attraction greater. 004 (part 1 of 1) 10 points Which of the following cations is likely to be hydrated in compounds? 1. Cs + 2. K + 3. Li + correct 4. Rb + 5. NH + 4 Explanation: Li + is the smallest. 005 (part 1 of 1) 10 points Gauthier, Joseph Homework 9 Due: Nov 6 2007, midnight Inst: Vandenbout 2 Which of the following compounds is UN- LIKELY to be commonly available and thus not found in the laboratory? 1. BaCl 2 2H 2 O 2. KCN 2H 2 O correct 3. La(NO 3 ) 3 6HO 4. Na 2 CO 3 10H 2 O 5. CuSO 4 5H 2 O Explanation: K + is only a +1 cation AND it is too large to substantially attract waters of hydration. +2 and +3 cations will generally form hydrates. Na + will also attract water due to its smaller size. 006 (part 1 of 1) 10 points What would be the most significant type of intermolecular forces in a liquid sample of fluoroform (CHF 3 )?...
View Full Document

Page1 / 5

HW9S - Gauthier, Joseph Homework 9 Due: Nov 6 2007,...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online