PPT-Equilibrium and change

The story of Krakatoa August 27 1983 The island was destroyed along with every living thing in its lush forests The remaining part of the island was buried in over 40 m of volcanic ash Within 9 months life returned to the island. - Science and Bio - Technol ogy Vol. 3 , No. 4, December, 2011 27 Punctuated Equilibrium vs. Phyletic Gradualism Monalie C. Saylo 1 , Cheryl C. Escoton 1 and Micah M. Saylo 2 1 University of Antiq Reactions are reversible. A + B C + D ( forward). C + D A + B (reverse). Initially there is only A and B so only the forward reaction is possible. As C and D build up, the reverse reaction speeds up while the forward reaction slows down.. 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 . 3.3.1- 3.3.5 Le . Châtelier's. Principle. Le . Châtelier's. Principle. If a system at equilibrium is subjected to an external stress, the equilibrium will shift to . minimize the effects of that stress.. Graph of Gradual Evolution. http://anthro.palomar.edu/synthetic/images/graph_of_phyletic_gradualism.gif. Some biologists claim that most evolutionary change takes place as a result of a series of very small changes . , June . 5, . 2015. HOMEWORK: . Evolution . Test June . 10,11,15,16. OBJECTIVE:. . I will be able to . identify two patterns that describe the rate of evolution using evidence for . evolution. DO . NOW: . Measuring Equilibrium Concentrations. Equilibrium Calculations (ICE Charts). Qualitatively Interpreting the Equilibrium Constant. Meaning of Small Equilibrium Constant. SCH4U – Grade 12 Chemistry, University Preparation. principle and more.... Feature. of Equilibrium State. Explanation. Equilibrium is dynamic. The reaction has not stopped but. the forward and reverse reaction are still occurring. Equilibrium is achieved in a closed system. Back in Time: General gas law . PV=. nRT. <=> P= . nRT. /V. Pressure is directly proportional to number of moles and temperature, and is inversely proportional to the volume occupied by the gas . Le. . Chatelier’s. . Principle. When a chemical system at equilibrium is disturbed by a change in a property of the system, the system always appears to react in the direction that . opposes. the change (until a new equilibrium is reached). Honors . Chemistrry. Enloe. High School. Chemical Equilibrium. Condition which the concentrations of all reactants and products in a closed system cease to change with time. Occurs when opposing reactions are proceeding at equal rates. … to change equilibrium states!. We have seen that…. …. equilibrium . is a. self-sustained state. ;. We have seen that…. … equilibrium is a self-sustained state;. …. objects in equilibrium . The Haber process proceeds as follows:. . 2NH. 3 (g). + 92KJ ↔ N. 2 (g). + 3H. 2 (g) . . If the equilibrium concentrations are:. [NH. 3. ] = 3.1x10. -2. M. [N. 2. ] = 8.5x10. -1. M. [H. 2. The Meaning of K. . K > 1 . . the equilibrium position is far to the right . K < 1 . . the equilibrium position is far to the left . The value of . K. for a system can be calculated from a known set of equilibrium concentrations. .