{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Homework 1-solutions - Version 218 Homework 1 Walker(53985...

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

View Full Document Right Arrow Icon
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 – find all choices before answering. This first 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. F 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. O S O O 2. O S O O 3. O S O O 4. O S O O 5. O S O O 6. O S O O 7. O S O O correct 8. O S O O 9. O S O O 10. 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
Image of page 1

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

View Full Document Right Arrow Icon
Version 218 – Homework 1 – Walker – (53985) 2 (SO 3 ) is O S O O 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 defined by the oxy- gen, carbon, and one of the hydrogen atoms in formaldehyde (CH 2 O)? 1. 120 correct 2. 110 3. 90 4. 180 Explanation: C O H H 007 1.0 points 7 ppm is equivalent to 1. 7 ppb. 2. 7,000 ppb. correct 3. 7,000,000%. 4. 7,000,000 ppm. 5. 7%. Explanation: 008 1.0 points The total mass of carbon in living plants and animals on Earth is approximately 7 . 5 × 10 17 g. How many parts per million of the total mass of earthly carbon (7.5 × 10 22 g) does this represent?
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern