PPT-Entropy, Enthalpy and Spontaneous Reactions

Spontaneous Reaction A reaction that occurs without outside intervention Once it occurs it can be fast or slow It can go to completion Recall the three products produced Precipitate table F gas or water. 6.04. What does ‘Spontaneous’ Mean in Chemistry?. A spontaneous change is a change in a system that proceeds without a net input of energy from an outside source.. Needs some activation energy to get started. SCH4U1 . Chapter 7. Equilibrium [noun]. 1. a. :. a state of intellectual or emotional balance . :. . poise. <trying to recover his . equilibrium. > . b. :. a state of adjustment between opposing or divergent influences or . Thermodynamics:. “The laws of thermodynamics describe the essential role of energy and explain and predict the direction of changes in matter. Basic concepts in Big Idea #5. Law of conservation of energy. Entropy (S), . Ethalpy. (H) and Gibbs Free Energy (G). What do we know about chemical reactions?. We can write chemical reactions and show how atoms and molecules come together to form products. . We can determine the energy change in a chemical reaction . IB Topics 5 & 15. PART 4: . . Entropy & Spontaneity. “The time has come,” the Walrus said, . “To speak of many things: . Of shoes--and ships--and sealing wax—. Of Entropy, Enthalpy, and Free Energy. Entropy and Free Energy. Free Energy and Spontaneous Reactions. Many times, the energy (heat) released from a chemical reaction can be used to bring about other changes. This energy is considered to be . Thermodynamics:. “The laws of thermodynamics describe the essential role of energy and explain and predict the direction of changes in matter. Basic concepts in Big Idea #5. Law of conservation of energy. Chapter 17. Homework. Due with next test. Page 807 . 23-71 . odd. Equations Sheet. Thermodynamics vs. Kinetics. Kinetics deals with . r. ate . of a . reaction, . this depends . on the pathway from reactants to products.. Thermodynamic Control of Reactions. Enthalpy. Bond Energies. Forming stronger. bonds favors. reactions.. Molecules with. strong bonds are. more stable.. Entropy. Randomness. Reactions that. See updates on slides . 1, 2, 3, and 8 . Announcements I. Exam 2: Two Weeks from Today (. 10/27. ). Mastering. Some confusion if you pay detailed attention to text (will discuss today. ). Lab: . Quiz 6 – on . Chapter 19 Free Energy and Thermodynamics Spontaneous vs Nonspontaneous A goal of thermodynamics is to predict the spontaneity of a process Spontaneous process- occurs without ongoing outside intervention Why do chemical reactions happen?. Topic . 15: Energetics (. 8. . hours). 15.1 . Standard enthalpy changes of reaction. 15.1.1 . Define and apply the terms standard state, standard enthalpy change of formation (¬H ) f. Section 20.1. Objectives ~. Compare and contrast exothermic and endothermic chemical reactions. Analyze the energy diagrams for typical chemical reactions. Illustrate the meaning of entropy and trace its role in various processes. 9 weeks. Spontaneity, Entropy and Free Energy. Chapter 17. Equation Sheet. Entropy. Spontaneous or thermodynamically favored (or sometimes just favored) means a reaction happens. The . common . characteristic .