hw5 - ctt253 Homework 5 Sparks (53535) 1 This print-out...

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Unformatted text preview: ctt253 Homework 5 Sparks (53535) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Which property is characterstic of ionic, but NOT covalent, compounds? 1. low melting point 2. conduct electricity in molten state cor- rect 3. usually gases or liquid 4. None of these 5. do not conduct electricity in aqueous so- lution Explanation: 002 10.0 points Which of the following contains only covalent bonds? 1. CCl 4 correct 2. NaCl 3. Na 2 SO 4 4. Ca(NO 3 ) 2 5. NaOH Explanation: Ionic bonding occurs between metals and non-metals while covalent bonding occurs among non-metals. The only answer choice that does not con- tain a metal is CCl 4 , which contains only covalent bonds. Polyatomic ions such as NO 1 3 are held to- gether with covalent bonds. This polyatomic ion is connected to calcium through ionic bonding, so calcium nitrate would contain both ionic and covalent bonds. 003 10.0 points NF 2 has (2, 3, 4) regions of high electron density and (2, 4, 6) bonded electrons. 1. 2; 2 2. 3; 2 3. 4; 6 4. 2; 6 5. 4; 2 6. 3; 6 7. 4; 4 correct 8. 3; 4 9. 2; 4 Explanation: N = 8 3 = 25 A = 5 + (7 2) + 1 = 20 S = 24- 20 = 4 First, draw the molecule. The number of regions of HED equals the number of bonds and the number of lone pairs. There are 4 shared, or bonded electrons, giving 2 regions of HED. The 2 F atoms have an octet. This means that 16 of the 20 available electrons are accounted for, leaving 4 electrons to be placed on the N atom as 2 lone pairs. Since there are 2 lone pairs, 2 bonds, that gives a total of 4 regions of HED. 004 10.0 points Choose the species that is incorrectly matched with electronic geometry about the central atom. 1. ClO 4 : tetrahedral 2. SO 2 3 : pyramidal correct 3. NO 2 : trigonal planar ctt253 Homework 5 Sparks (53535) 2 4. BrO 4 : tetrahedral 5. ClO 3 : tetrahedral Explanation: 005 (part 1 of 2) 10.0 points What is the molecular shape of I 3 ? 1. trigonal bipyramidal 2. linear correct 3. bent 4. tetrahedral 5. trigonal planar 6. trigonal pyramidal Explanation: I 3 is linear (AX 2 E 3 ): bracketleftbigg I I b b b b b b I b b b b b b b b b b b b bracketrightbigg since the lone pairs occupy equatorial posi- tions....
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hw5 - ctt253 Homework 5 Sparks (53535) 1 This print-out...

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