Chem 115 1nd EditionExam # 3 Study Guide Lectures: 15-18Lecture 15 (February 21)Know how to do redox reactions.Lecture 16 (February 24)What is the difference between endothermic and exothermic?Exothermic gives off heat and endothermic absorbs heat.Know the calorie and joule conversions.What is enthalpy?Chemical change at a constant pressure.Lecture 17 (February 26)What is the equation for calorimetry?q = mc TWhat is the C of H2O?4.184 J/gkLecture 18 (February 28)What does a Calorie equal?1000 cal or 1 KcalWhat does H rely on in a thermochemical reaction?Whether the reaction is endothermic or exothermicKnow how to use H in a problem.What is Hess’ Law?Enthalpy change of overall process is the sum of enthalpy changes of its individual stepsWhat are the steps to calculate Hess’ Law?1. Change sign of H when you reverse the equation2. Multiply mole amount and H by the same factor3. Add manipulated equations and results of H values to get to the
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