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    Thermochemistry

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    2013/07/09 Lecture Presentation Chapter 5 Thermochemistry John D. Bookstaver St. Charles Community College Cottleville‚ MO © 2012 Pearson Education‚ Inc. Energy • Energy is the ability to do work or transfer heat. – Energy used to cause an object that has mass to move is called work. – Energy used to cause the temperature of an object to rise is called heat. Thermochemistry © 2012 Pearson Education‚ Inc. 1 2013/07/09 Kinetic Energy Kinetic energy is energy an object possesses

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    Thermochemistry

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    Thermochemistry Photo by: Arto Thermochemistry is the study of the heat released or absorbed as a result of chemical reactions. It is a branch of thermodynamics and is utilized by a wide range of scientists and engineers. For example‚ biochemists use thermochemistry to understand bioenergetics‚ whereas chemical engineers apply thermochemistry to design manufacturing plants. Chemical reactions involve the conversion of a set of substances collectively referred to as "reactants"

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    Thermochemistry

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    0 References |   |   |   |   |   |   |   | 16 | 1.0 Introduction Thermochemistry is the study of the energy and heat associated with chemical reactions and/or physical transformations. A reaction may release or absorb energy‚ and a phase change may do the same‚ such as in melting and boiling. Thermochemistry focuses on these energy changes‚ particularly on the system ’s energy exchange with its surroundings. Thermochemistry is useful in predicting reactant and product quantities throughout the

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    Thermochemistry

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    Thermochemistry Lab Purpose: This lab taught procedures for determining heat of capacity of a calorimeter and measuring enthalpy of change for three reactions. It also enforced methods of analyzing data obtained through experimentation and calculating enthalpy. These procedures are used in the branch of thermodynamics known as thermochemistry which is the study of energy changes that accompany chemical reactions. Concepts from this lab can be used to determine the potential energy of a chemical

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    Thermochemistry 1of3

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    by W. Whitten‚ R. Davis‚ R.‚ M. L. Peck‚ and G. Stanley. Chemical Thermodynamics: Heat and Thermochemistry Thermodynamics & Thermochemistry Thermodynamics is the study of heat and its transformations to and from other forms of energy Thermochemistry is a branch of thermodynamics that deals with the heat involved with chemical and physical changes Objectives 1. Define thermodynamics & thermochemistry 2. Define energy‚ heat and other thermodynamic terms 3. Define enthalpy 4. Discuss thermochemical

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    Thermochemistry

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    3. Thermal energy 4. Chemical energy 5. Potential energy Energy Changes in Chemical Reactions Heat – is the transfer of thermal energy between two bodies that are at different temperature. Thermochemistry – is the study of heat change in chemical reactions. Terms: System – part of the universe set aside for study. Surroundings – part of the universe outside the system Types of systems: 1. Open

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    Thermochemistry IB questions 1. Ammonium nitrate‚ NH4NO3‚ dissolves readily in water according to the equation: NH4NO3(s)  NH4+(aq) + NO3-(aq) H = 28kJ mol-1 Which of the following contribute(s) to the occurrence of this process? I. The system moves to lower enthalpy. II. The system becomes more disordered. a. I only b. II only c. Both I and II d. Neither I nor II 2. Which substance has the largest lattice energy? a. NaF b. KCl c. MgO d. CaS 3. A certain reaction is spontaneous

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    Thermodynamics and Thermochemistry The study of energy and its transformations is known as thermodynamics. Thermochemistry is the branch of thermodynamics that relates to chemical reactions and energy changes involving heat. Most thermochemical studies are conducted in a laboratory where the transfer of heat can be carefully monitored in a closed system. The measurement of heat transfer is called calorimetry. The device in which heat transfer is measured is called a calorimeter. A calorimeter can

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    2 9 13 Thermochemistry

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    TUTORIAL 9: THERMOCHEMISTRY 1. 2. 3. The following terms are often used in thermochemistry. Explain each one of them by giving an appropriate example: (a) Standard enthalpy change (b) Exothermic process (c) Endothermic process Define and write an example of thermochemical equation for each of the following terms: (a) Enthalpy of formation (b) Enthalpy of combustion (c) Enthalpy of atomisation (d) Enthalpy of neutralisation (e) Enthalpy of hydration (f) Enthalpy of solution (dissolution)

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    CHEMISTRY – THERMOCHEMISTRY INTRODUCTION WORKSHEET DEFINE THE FOLLOWING TERMS: BOILING BOILING POINT CALORIE (OR KILOCALORIE) CONDENSATION DEPOSITION ENDOTHERMIC REACTION ENTHALPY OF FUSION ENTHALPY OF VAPORIZATION EVAPORATION EXOTHERMIC REACTION FREEZING HEAT JOULE MELTING MELTING POINT SPECIFIC HEAT SUBLIMATION TEMPERATURE VAPOR VAPOR PRESSURE VAPORIZATION VOLATILE Name ________________________________________ Date ______________ Period _______ HONORS CHEMISTRY – THERMOCHEMISTRY INTRODUCTION

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