These questions deal with some new concepts and vocabulary that we will use in U
ID: 1422151 • Letter: T
Question
These questions deal with some new concepts and vocabulary that we will use in Unit 4. Refer to the Intro Model of Thermodynamics, as well as to everything you have learned in this course up to now. to help you answer the following prompts. What energy systems contribute to the internal energy. U? At temperatures below about 1000 K. which energy systems change, and thus contribute to DeltaU? In the equation "Delta U = Q + W" why does the U have a "Delta" in front of it. but Q and W do not have "A's? (You are expected to answer this based on what you learned previously in the study of the Energy-Interaction Model) In your own words, what is a state function? Which of the following are state functions and which are processes? How can you tell? How are states and processes represented on state diagrams?Explanation / Answer
a) Not sure to understand what "systems" means here, anyway internal energy describes the rotational, trasnlational, vibrational and zero point energy of a system
b) Internal energy is a function of state, that is is an excat differenctial function. Heat and work are not. Internal energy describes a state of the system and does depend onlu upon temperature. when you transform a system you change the heat and work properties of the system and thus change the internal energy, but this deos not depends upon the trasnfromation type while for Q, W this matters.
c) A state function is a function that describes the equilibrium states of a theromodynamic system that does not depends upon the transfrom type. Sorry but I doont know all the symbols meanings on your book but:
Q,T,W,P are not state functions since depends upon the trasnfrom type.
d) States are a point on state diagrams, identified with a couple of variables (ex P,V), while processes are lines (ex straight horizontal line is aun isopressure on PV)
e) This is the area subtended by the transform
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