CHEM 400 Fall 2022 Exam
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Questions and Answers

What is the total score of the CHEM 400 exam?

  • 100 (correct)
  • 120
  • 80
  • 140

How many pages are there in the exam?

  • 6
  • 8
  • 5
  • 7 (correct)

What is the time limit to complete the exam?

  • 120 minutes
  • 80 minutes (correct)
  • 60 minutes
  • 90 minutes

What should be circled in the answer sheet?

<p>The answer choice (B)</p> Signup and view all the answers

What should be used to check calculations?

<p>A programmable calculator with cleared memory (C)</p> Signup and view all the answers

What is the significance of page 7?

<p>It has a periodic table and useful information (B)</p> Signup and view all the answers

What is the correct ranking of the phase letters in terms of their physical states?

<p>A = solid, B = gas, C = liquid, D = triple point (C)</p> Signup and view all the answers

What is the correct order of bond angle for the given compounds?

<p>CS2 &gt; CF4 &gt; SCl2 (C)</p> Signup and view all the answers

What is the correct valence bond diagram for HCN?

<p>Hsp2-Csp-Nsp (A)</p> Signup and view all the answers

What is the estimated ΔH°rxn for the reaction C2H2(g) + 2H2(g) → C2H6(g)?

<p>-292 kJ/mol (B)</p> Signup and view all the answers

At what temperature would water boil at the lowest point of Death Valley?

<p>100.23 ℃ (A)</p> Signup and view all the answers

What is the correct ranking of the intermolecular forces (IMF) in decreasing relative strength?

<p>hydrogen bonding &gt; dipole-dipole &gt; London dispersion &gt; ionic (A)</p> Signup and view all the answers

What is the bond order of NO- according to Molecular Orbital Theory?

<p>1.5 (D)</p> Signup and view all the answers

What is the process represented by the equation K(s) → K(g)?

<p>Vaporization (D)</p> Signup and view all the answers

What is the unit of the gas constant R?

<p>J/mol·K (D)</p> Signup and view all the answers

What is the purpose of constructing a Born-Haber cycle?

<p>To calculate the heat of formation of a compound (A)</p> Signup and view all the answers

What is the physical meaning of the sign of the heat of formation (∆Hf°)?

<p>It indicates the exothermicity of the reaction (C)</p> Signup and view all the answers

What is the number of electron groups around the central atom in a molecule with sp3 hybridization?

<p>4 (A)</p> Signup and view all the answers

Which of the following statements about vaporization is FALSE?

<p>Molecules with hydrogen bonding are more volatile than compounds with dipole-dipole forces. (C)</p> Signup and view all the answers

What is the electron geometry and molecular geometry of SO2?

<p>Trigonal planar, bent (D)</p> Signup and view all the answers

How much energy is required to vaporize 98.6 g of ethanol (C2H5OH) at its boiling point?

<p>86.7 kJ (B)</p> Signup and view all the answers

What is the bond angle in NH3?

<p>104.5° (A)</p> Signup and view all the answers

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