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Quiz 2 for CHM 1046 Fall, 2008 - Hydrogen Bonding and Melting Points, Quizzes of Chemistry

Valencia CollegeChemistry

A quiz for the chm 1046 fall, 2008 class focusing on hydrogen bonding and melting points. Students are required to draw pictures of molecules hydrogen bonding, answer questions about the melting points of various compounds, and explain the differences in physical characteristics between ethylene glycol and pentane. An additional question offers 4 extra credit points for explaining how crystalline structure is determined experimentally.

Typology: Quizzes

2009/2010

Uploaded on 02/25/2010

koofers-user-e6z
koofers-user-e6z 🇺🇸

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CHM 1046 Fall, 2008
Quiz 2
Name (print)_________________________
1. Draw a picture of two molecules hydrogen bonding. Use Lewis dot structures for any
two molecules that can H-bond and a dashed line for the hydrogen bond.
Information for questions 2 and 3.
Compound H2O NaCl MgO Quartz, SiO2
Melting Point (°C) 0 801 2800 1610
2. Why is the melting point for NaCl so much higher than the melting point for H2O?
3. Why is the melting point for MgO so much higher than the melting point for NaCl?
4.
Assuming the larger atoms are A and the smaller atoms are B, what is the formula for the
compound? What type of unit cell is this?
5. Ethylene glycol (CH2OHCH2OH) is a slightly viscous liquid that boils at 198°C.
Pentane (C5H12), which has approximately the same molecular weight as ethylene
glycol, is a nonviscous liquid that boils at 36°C. Explain the differences in physical
characteristics of these two compounds.
4 points extra credit: How is crystalline structure determined experimentally?

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Download Quiz 2 for CHM 1046 Fall, 2008 - Hydrogen Bonding and Melting Points and more Quizzes Chemistry in PDF only on Docsity!

CHM 1046 Fall, 2008 Quiz 2 Name (print)_________________________

  1. Draw a picture of two molecules hydrogen bonding. Use Lewis dot structures for any two molecules that can H-bond and a dashed line for the hydrogen bond. Information for questions 2 and 3. Compound H 2 O NaCl MgO Quartz, SiO 2 Melting Point (°C) 0 801 2800 1610
  2. Why is the melting point for NaCl so much higher than the melting point for H 2 O?
  3. Why is the melting point for MgO so much higher than the melting point for NaCl?

Assuming the larger atoms are A and the smaller atoms are B, what is the formula for the compound? What type of unit cell is this?

  1. Ethylene glycol (CH 2 OHCH 2 OH) is a slightly viscous liquid that boils at 198°C. Pentane (C 5 H 12 ), which has approximately the same molecular weight as ethylene glycol, is a nonviscous liquid that boils at 36°C. Explain the differences in physical characteristics of these two compounds. 4 points extra credit: How is crystalline structure determined experimentally?