Unknown Acid Lab

For two days, we have worked on determining the thermochemical properties of an unknown acid - melting/freezing point, heat capacity of liquid, heat of fusion, heat capacity of solid.  I appreciate all of your hard work.  From this experience, I hope that you acquired a deeper understanding of these properties as well as recognized the tedious work required for performing experiments (remember that chemists are not wanting to gather "okay" data; they desire to collect very precise and accurate data that the lab setting, materials, and equipment will afford).  On Monday, groups will have one last opportunity to collect data and work on organizing information for the formal lab report.  The formal lab report will be due Thursday.  Next week, we will also be preparing for the Unit 3 exam which will be on Friday.

HW: Answer the following questions on a separate sheet of paper (not in your journal) using your textbook (Chapter 14 - Kinetic Molecular Theory Applied to Liquids and Solids pp 458-460 & Phase Diagrams p 488, 493):

1. Describe the differences between the three states of matter.
2. Describe the Kinetic Molecular Theory as it is applied to liquids.
3. Describe the Kinetic Molecular Theory as it is applied to solids.
4. Think about various solids, liquids, and gases.  What factor other than differences in temperature is causing these substances to be in different states?
5. How might attractive forces (strong, moderate, weak) between particles affect the way particles in these substances act?
6. Would these attractive forces affect the three states of matter for these substances? Why or why not?
7. What is a phase diagram?  What is the triple point of a substance?
8. Draw the phase diagram for carbon dioxide shown on page 493.
9. Describe the changes that take place when a sample of solid carbon dioxide is heated from -100 degrees C to -50 degrees C with pressure constant at 1 atm.
10. What process is taking place when I perform demonstrations with dry ice (frozen carbon dioxide)? Does this process produce a liquid?  What conditions are necessary to obtain a sample of liquid carbon dioxide?