Basic GI Research
Basic GI Research GAS 290
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This 3 page Class Notes was uploaded by Dr. Filiberto Hintz on Tuesday September 8, 2015. The Class Notes belongs to GAS 290 at University of California - Davis taught by Staff in Fall. Since its upload, it has received 1141 views. For similar materials see /class/187535/gas-290-university-of-california-davis in Med Intrl Gastroenterology at University of California - Davis.
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Date Created: 09/08/15
Physics 7A DLM 11 Overview CG 32 Connection of AtomAtom Potentials to Eth amp Ebond Act 325 Follow up of CG 32 FNTs 45 min Learning Goals Consolidate understanding of the construct bond energy from a microscopic particle perspective and the relationship of this particle bond energy to empirically determined heats of vaporization Consolidating understanding of the relationship of various energies of a group of particles Consolidating understanding of the relationship of bond energy to well depth Act 326 A Particle Model ol Thermal Energy 11 Analysis 45 min Learning Goals 0 First pass at making sense of the relationship between and the differences in the various energies used in connection with the bond and thermal energies of solids and liquids on the one hand and the macroscopic energies used in the energyinteraction model on the other hand Act 327 Analyzing Energies with Two Types of Atoms 40 min Learning Goals Practice connecting the observed macroscopic behavior melting amp evaporating of groups of particles in the simulation Atoms in Motion with their microscopic properties Consolidating understanding of the relationship of microscopic properties well depth to macroscopically observed properties of melting and evaporating Addendum Activity 327 to be passed out in class Activity 327 was inadvertently omitted from the Workbook Text Reading Assignment Continue studying and reviewing the Chapter 3 Everything in this chapter should be making a lot of sense to you now thsics 7A DL Activitv 327 Analyzing Energies with Two Types of Atoms Information about this Atoms in Motion Simulation Bring up the Atoms in Motion file 2515 1 on the computer It can be found in a folder on the desktop labeled Student files The simulation is set up as follows 0 25 cyan atoms Type A in the liquid phase 15 larger red atoms Type B in the solid phase 0 All atoms attract each other with an atom atom potential modeled mathematically as a Lennard Jones potential but the force between the reds is the strongest between the cyan atoms the next strongest and between red and cyan atoms the least strong 0 The system is in equilibrium and stopped when the program is opened 0 There is a lot of uctuation in the values of all energies and temperatures on a time scale of 10 14 sec but not on a human time scale This is due to the small number of atoms and the fact that there is not a very strong interaction between the red and cyan atoms 0 Because of the large uctuations you will have to wait a significant length of time with the EAVG function turned on to be sure you are near equilibrium this refers to part 4 below Think Discuss Write on the Board 1 Use the BOND menu to record the depth of the atom atom potentials for each combination A A A B and B B Remember Type A is cyan and Type B is red Sketch all three potential plots on one graph so you can compare both the depths and the rO values of the potential minima Go to the ATOM menu to get information on each atom type 2 v If you forgot that Type A was the cyan atom and Type B was the red atom you could figure out which color belonged to which type just by looking at the atom atom potential graphs and seeing the atoms on the screen How could you tell the difference from the graphs 3 v Use the general Particle Model of Matter and the Particle Models of Bond Energy and Thermal Energy to predict what you think will happen as you gradually add more energy to this system Why do you think this is what will happen Take your prediction to the point where a large amount of energy has been added 4 v Add energy and describe what happens steps of 25 work well or you can add more each time to make things happen faster How does what you observed relate to the atom atom bond energies for the different types of atoms Physics 7A Exit Handout DLM 11 FNTS For these FNTs you will need to refer to Sections 33 Model Relationship 6 and 35 of your textbook For the first four FNTs consider one atom in the interior of a solidliquid as described in Act 323 33 1 If we model the thermal motion as described in Sect 3 5 of the text how many independent springs does it take to model the thermal motion of this one atom 33 2 How many independent thermal KE s are there for this atom 33 3 How many independent thermal PE s are there for this atom 33 4 How many independent ways are there for this atom to have thermal energy Note We will call an independent way for a system to have thermal energy a mode In other physics textbooks you may see this referred to as a degree of freedom 33 5 What is the relationship between temperature T and the amount of thermal energy per mode 33 6 For each of the following pairs circle the system that has the greater thermal energy If their thermal energy is the same circle both a 1 mole ofa monatomic solid at 250 K 1 mole ofa monatomic solid at 300 K b 2 moles ofa monatomic solid at 273 K 1 mole ofa monatomic solid at 273 K c 1 mole ofa monatomic gas at 290 K 1 mole ofa monatomic solid at 290 K d 1 mole ofamonatomic gas at 300 K 602 x 1023 atoms ofa monatomic gas at 300 K e 1 mole ofa diatomic gas at 290 K 1 mole ofa monatomic gas 290 K 33 7 a Assume that a substance in a closed container is at thermal equilibrium with about half of its molecules in the gas phase and half of its molecules in the liquid phase How could you use the Particle Model of Thermal Energy to explain which molecules are moving faster on averagethose in the gas phase those in the liquid phase or neither b Now assume that liquid water H20 and gaseous oxygen 02 are at thermal equilibrium in a closed container at room temperature How would your explanation for which molecules are moving faster the H20 molecules in the liquid phase the O molecules in the gas phase or neither be the same as your explanation in part a and how would it differ 33 8 Think about the modes of substances in the gas phase and explain why potential energy is included in the thermal energy of some substances in the gas phase but not in other substances in the gas phase 33 9 You derived the following equations for solids and liquids in DL Activity 324 A Particle Model of Thermal Energy 11 Analysis PE Ebond 12Ethermal and KE 12Ethermal Use what you have learned about how thermal energy is divided among the modes to answer the following question When a monatomic solid liquid turns into a gas what are the PE and the KB equal to then
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