PPT-Thermochemistry Energy change that occurs during a chemical reaction and/or changes in

A form of energy Flows from warmer objects to cooler objects Represented by the variable q Measured by units calorie or joule 1 J 02390 cal 4184 J 1 cal 1000 cal 1 kilocalorie . Feeling hot, hot, . hot. Thermochemistry. Thermochemistry. – concerned with the changes that occur during a. reaction.. Heat ( ) - that transfers from one object to another because of a. Chapter 17. Pages 511-524. Phase Diagrams. -a graph of pressure vs. temp that shows the conditions under which the phases of a substance exist. Triple point – . indicates the T and P conditions at which the solid, liquid, and vapor of the substance coexist at eq. 10/20/14. What are Physical Properties?. Physical properties can be . observed. and measured without changing the . identity. of the substance. . Phase. Changes: . Melting. Point: the temperature at which a substance . Heat. Transfer and Specific Heat. Energy Changes in Chemical Reactions. Calculating . ∆H. Heat. Definition. The. energy transferred between samples of matter due to differences in their temperature.. The study of . energy. changes that occur during chemical reactions (chemical change) AND changes in state (physical change. ).. Did you know?. Chemical energy is stored in chemical bonds of a substance. This is called . EVIDENCE of a CHEMICAL REACTION . (aka a . CHEMICAL CHANGE. ). . . . . . T. he decomposition of hydrogen peroxide H. 2. O. 2. . !!. 2 H. 2. O. 2. . . 2 H. 2. O + . O. 2. http. ://. www.youtube.com/watch?v=4N0m95PExHY. INTRODUCTION. All reactions require energy to break bonds in the reactants, and all reactions give off energy when new bonds form to make products. The difference in energy required to break the bonds and to make the new bonds can tell you whether the reaction is endothermic or exothermic. . . -study of heat changes that occur during chemical reactions, study of relationships between chemistry and energy. energy. - ability to do work or supply heat. -unlike matter, energy is weightless, odorless, tasteless. Ionic compounds can form from transition metals. Transition metals do not always follow the patterns that we discussed. Can have more than one oxidation number (charge. ). To identify the charges of transition metals, roman numerals are placed in their name, directly after the transition metal. By . DR T. . O AKINOLA. PRINCIPLES OF CHEMICAL PREPARATIONS FOR COLD THERAPY AND ENDOTHERMIC REACTIONS. What . is an Endothermic Reaction. You might think of chemical reactions as occurring exclusively in laboratories, but in reality, they occur in the world around us and in our own bodies every day. . Define. . temperature. and state the units in which it . is measured.. Define. . heat. and state its units.. Perform. specific-heat calculations.. Solve. . problems involving enthalpies of reaction, enthalpies of formation, and enthalpies of combustion.. Chemical Reactions. Chemical reactions occur every minute of every day. . Some are very fast, such as the reaction of sodium with water. . Others are very slow, such as iron rusting. . Some are somewhere in-between, such as milk going sour. . Change. First Law of Thermodynamics. Heat . (q. ). ,. work (. w. ) and internal energy (. E. ). Calculation of heat gained or lost by system. Calorimeter for measuring heat exchange (between system and surrounding;. THERMOCHEMISTRY. The study of heat released or required by chemical reactions. Fuel is burnt to produce energy - combustion (e.g. when fossil fuels are burnt). CH. 4. (g) + 2O. 2. (g) CO.