PPT-Enthalpy, Hess’ law, and thermochemical equations

Quick Review of Concepts We have been introduced to heat producing exothermic reactions and heat using endothermic reactions Heat is a measure of the transfer of energy from a system to the surroundings and from the surroundings to a system. is the enthalpy change when one mole of a compound is formed from its constituent elements under standard conditions. . Enthalpy Change of reaction . is the enthalpy change that accompanies a chemical reaction in molar quantities expressed in a chemical equation. . Enthalpy and Hess’s Law. Energy Changes in Chemical Reactions. Let’s take a typical reaction. CH. 4 . (g) + O. 2. (g) .  CO. 2. (g) + 2 H. 2. O (l). . This is an example of ‘burning a fossil fuel.’ This reaction releases energy! . Internal Energy Equation. ΔE = Q + W = Q . + . PΔV. If the reaction is carried out at a constant volume (ΔV = 0) , then ΔE = Q. If volume is constant, any heat added or removed changes the internal energy. Enthalpy. Enthalpy (H)is the total amount of energy contained within a substance. Included all forms of energy, kinetic, potential…. Very difficult to measure all forms of energy within a substance, therefore a change in enthalpies is measured whenever a change occurs.. Bonds and Energy. Breaking chemical bonds . requires. energy. Forming chemical bonds . releases. energy. The amount of energy required or released for a chemical process depends on the number and types of bonds that are formed and broken. Lecture 8 Topics. . Brown chapter 5. 8.1. :. . Kinetic . vs. potential energy. . 5.1. 8.2. :. . Transferring . energy as heat & work. Thermal energy. 8.3: . System . vs. surroundings. CHAPTER. . THIRTEEN. Valvular Heart Disease. The . four valves . (tricuspid, pulmonary, mitral, and aortic) of the human heart work . in concert . to ensure unidirectional flow . of . blood through the chambers of the heart and the pulmonary and systemic circuits. The valves themselves are avascular, thin . Enthalpy . is a state function . (the pathway does not matter) with . the symbol . H. ..  . H . = E . P V. E . is the internal energy of the system, P is the pressure of the system, and V is the volume of the system.. Peter Ota. Content Overview. Thermochemical Cycles. Heat sources for thermochemical cycles. Iodine-Sulfur cycle. Bromine-Sulfur hybrid cycle. Hybrid sulfur cycle. Conclusion. Thermochemical Cycles. Combine heats source with chemical reactions to split water into hydrogen and oxygen. Core. Claudia . Gaxiola. October 14, 2013. OUTCOMES. Significance of . DOK / Bloom’s. Rigor and Common . Core State . Standards. Implications . for instruction. What is Rigor?. Do you have a solid definition?. Core. Claudia . Gaxiola. October 14, 2013. OUTCOMES. Significance of . DOK / Bloom’s. Rigor and Common . Core State . Standards. Implications . for instruction. What is Rigor?. Do you have a solid definition?. Examples:. . 1). . . x 3 = 15. . 2) p – 5 = 20. 3) 2d = 16. 4). . = 24.  . Multi-Step Equations. Examples—. 5). 2p 15 = 29. 6). 14 – 3n = -10. 7). 27 = -9(y 5). 8). 7a – 3a 2a – a = 16. ManuscriptunderreviewforjournalHydrol.EarthSyst.Sci.Discussionstarted:29August2018c Author(s)2018.CCBY4.0License. Hydrol.EarthSyst.Sci.Discuss.,https://doi.org/10.5194/hess-2018-362 Manuscriptunderrev DWD ECMWF Calibration Meeting 12 February 2015 Reinhold Hess, Jenny Glashof , Cristina Primo Deutscher Wetterdienst Calibration with MOS at DWD  Outline  Overview of MOS Systems at DWD 