chemhw5 - explanation for this. Support your explanation...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

This homework help was uploaded on 04/22/2008 for the course CHEM 152 taught by Professor Schafer during the Spring '08 term at San Diego.

Page1 / 2

chemhw5 - explanation for this. Support your explanation...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online