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# DLM13 - Physics 7A DLM 13 Overview CG 3.3 Modes and...

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Physics 7A DLM 13 Overview CG 3.3 Modes and Equipartition NOTE: The Following is a NEW ACTIVITY to be handed out in Class) Act-3.3.4 Applying the Models: FNTs 3.3-10 – 3.3-13 (~60 min) Learning Goals Understand the Particle Model of Thermal Energy at an intuitive level , prior to using them to explain empirically determined heat capacities Gain more practice constructing explanations using model relationships CG 3.4 Analyzing Behavior of Real Substances Act-3.4.1 Using the Particle Model of Thermal Energy to Understand the Learning Goals Microscopic Basis of Heat Capacity (~40 min) Be able to determine heat capacity using a graph of energy vs. temperature. Really understand the connection between heat capacity, modes, and the particle model of thermal energy. Act-3.4.2 Making Sense of Heat Capacity Data (Finish as FNT) (~40 min) Know that some modes are only activated at high temperatures. Be able to explain the effect of activating additional modes on the heat capacity of a substance. Text Reading Assignment a) Re-read pages 71-80. b) Start making sense of the Intro Model of Thermodynamics on the blue fold-out sheet. Focus on the parts covered in the reading that has been assigned so far.

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Physics 7A Exit Handout DLM 13 FNTs 3.4-1) (Re-read about modes and the Particle Model of Thermal Energy in Section 3-5 of your text.) The graph in section 3-2 of your text displays graphical information about the constant volume molar heat capacity of some pure substances in the gas phase by showing plots of c V /R as a function of Temperature. In this FNT we will make sense of some of those plots: particularly the monatomic gases, hydrogen gas (H 2 ) and nitrogen gas (N 2 ). Remember that c V /R = (number of modes per particle/2). (See Activity 3.4.1, “The Microscopic Basis of Heat Capacity”)
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