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chemhw5 - explanation for this Support your explanation...

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General Chemistry Lecture, Spring 2008, HW #4 Last Name: First Name: 1) A graph of temperature vs. heat added for 1-propanol (CH3CH2CH2OH) is shown below. The melting point of 1-propanol is - 127 °C, and the boiling point is 97 °C. a) What is the phase between points C and D? Liquid b) What process occurs as you go from point D to point E? Vaporization; liquid becomes a gas c) What is the temperature between points B and C? -127 ° C, the temp. stays the same from B to C d) Notice that in going from point D to point E, the temperature is not changing even though heat is being added. Why not? Give a molecular explanation using one or two sentences A substance must completely change phase before the temperature of the system can change. e) The following molecule has the same molar mass and formula as 1-propanol, but it has a much lower boiling point. Examine intermolecular forces and give a molecular
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Unformatted text preview: explanation for this. Support your explanation with the appropriate structures and illustrations. The reason that 1-propanol has a greater boiling point is because there are H-bonds between the oxygen and the hydrogen on the hydroxyl group of 1-propanol and there are no H-bonds in the given structure. H-bonds raise the boiling point of molecules and despite both of these molecules having the same number of carbon atoms, hydrogen atoms, and oxygen atoms, the lack of H-bonds in the given molecule results in a lower boiling point. 2) What kind of intermolecular forces are present in of the following substances (dipole- dipole, dispersion forces, hydrogen bonding)? List all that apply for each molecule. a) HF H-Bonds Dipole forces Dispersion forces b) PCl3 Dipole forces Dispersion forces c) SO2 Dipole forces Dispersion forces...
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