PPT-Lecture 5 Electron and Hole concentration at equilibrium

1 Recap In last lecture temperature effect on extrinsic semiconductor was discussed Both d onar and acceptor ionization shows Freeze out region at low temperature A t moderate temperature all . AP . Chem. Mr. Nelson. The Concept of Equilibrium. The term . reversible reaction . is used to describe reactions that can go in either the forward or the reverse direction. Equilibrium. is used to specify that a reversible reaction has reached an . Dr. Ron Rusay. © Copyright 2003-2010 R.J. Rusay. Chemical Equilibrium. The reactions considered until now have had reactants react completely to form products. These reactions “went” only in one direction.. electron, and electron-neutrino have =+1; their anti-particles have =-1; muon, and muon-neutrino have =+1; their anti-particles have THUS, there should be two types of neutrinos: electron-kind and muo A . reversible reaction . can be approached from either direction. In a . closed system. , no reactants or products can enter or escape. For equilibrium to be achieved, a reaction must be . reversible. For example H. 2. + I. 2. .  2HI. If more H. 2. is added, the forward reaction is favoured until equilibrium is resorted.. If the concentration of I. 2. is increased, the forward reaction is favoured until . Measuring Equilibrium Concentrations. Equilibrium Calculations (ICE Charts). Qualitatively Interpreting the Equilibrium Constant. Meaning of Small Equilibrium Constant. SCH4U – Grade 12 Chemistry, University Preparation. Intended Student Learning. Must be able to describe the dynamic nature of a chemical system at equilibrium. Must be able to write . K. c. expressions that correspond to given reaction equations. Perform calculations involving . Tutor: Peter Harris. Click on the buttons to move between slides. .. (Make sure you are in “Slide Show” mode). The aims of this course are:. ● . to explain how X-rays are generated in the electron microscope. Readings:. Leach, Chapters 2 and 3. Competitive Equilibrium. Q: What kinds of social arrangements cause private (self) interests to become aligned with the public (collective) interest?.  . A: Adam Smith’s central thesis in the Wealth of Nations . Screw And Surface. Counterbore. Countersink. Threaded hole. Clearance Hole. . Scalars and vectors. . Types of forces. . Resultant of forces. . Equilibrium of particles. Scalar and Vectors. . Scalar - . a physical quantity that is completely described by a real number. Using Spectrophotometry . and Beer’s Law. Objectives:. . 1.) To determine the . equilibrium constant. for the reaction of iron (III) and thiocyanate to form the thiocyanatoiron(III) complex ion using spectrophotometric data.. . When the rates of the forward and reverse reactions become equal, the concentrations of the reactants and the products remain constant. This is the stage of chemical equilibrium. This equilibrium is . Read Chapter 13 look at the problems. Do . the AP practice test on page AP-13 A-D. (it is in between numbered pages 547-548). 2. AP Test. Historically, the first question on the free response has ALWAYS been an equilibrium question..