Homework 1-solutions

# Homework 1-solutions - Version 218 Homework 1 Walker...

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Version 218 – Homework 1 – Walker – (53985) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. This frst homework assignment consists primarily oF review-type questions. 001 1.0 points Which set oF units is NOT in order oF increas- ing magnitude? 1. mm < cm < dm 2. μ g < mg < ng correct 3. cPa < dPa < kPa 4. μ L < dL < kL 5. μ W < kW < MW Explanation: One ng is 10 9 g. One mg is 10 3 g. One μ g is 10 6 g. A ng is smaller than a mg and smaller than a μ g. 002 1.0 points Which oF the Following species has 5 valence electrons? 1. ± 2. As correct 3. B 4. Mn 5. Ne Explanation: Valence electrons are the electrons in the outermost s and p orbitals. 003 1.0 points Which oF the Following is the correct Lewis Formula For sulFur trioxide (SO 3 )? 1. b b b b b b b b b b b b b b b b b b O S O O 2. O b b S b b b b O b b b b b b O 3. b b b b b b b b b b b b O S O O 4. b b b b b b b b b b b b b b O S O O 5. b b b b b b b b b b O S O O 6. b b b b b b b b b b b b b b b b b b b b b b b b O S O O 7. O b b b b b b b b S b b b b O b b b b b b O b b b b b b correct 8. b b b b b b b b b b b b b b b b b b b b O S O O 9. O S O O b b b b b b b b b b b b b b b b b b 10. b b b b b b b b b b b b b b b b b b b b b b b b b b O S O O Explanation: N = 8 × 4 = 32 A = 6 × 4 = 24 S = N - A = 32 - 24 = 8 There are 8 shared electrons, and the re- maining electrons are placed around oxygen, so that each oxygen atom has 8 electrons. Thus the Lewis Formula For sulFur trioxide

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Version 218 – Homework 1 – Walker – (53985) 2 (SO 3 ) is O b b b b b b b b S b b b b O b b b b b b O b b b b b b 004 1.0 points The electronic arrangment is the same as the molecular shape when 1. the molecule is not polar. 2. the number of bonding orbitals equals the number of anti-bonding orbitals. 3. there are more shared electrons than non- shared electrons. 4. there are no lone pairs of electrons on the central atom. correct 5. the atoms are joined by sigma bonds. Explanation: The only time that the molecular shape and electronic arrangement are the same is when there are no lone pairs of electrons on the central atom. 005 1.0 points The basic fact that determines molecular shapes is that 1. nuclei attract each other. 2. electrons attract each other. 3. nuclei repel each other. 4. nuclei attract electrons. 5. electron pairs repel each other. correct Explanation: 006 1.0 points What is the bond angle deFned by the oxy- gen, carbon, and one of the hydrogen atoms in formaldehyde (CH 2 O)? 1.
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## Homework 1-solutions - Version 218 Homework 1 Walker...

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