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Objectives:

Objectives: . To be able to: See where heat is a part of any chemical reaction. Homework. Formal Lab Report due Wednesday 5/25 on Turn It In.com Complete Worksheet. Definitions. Thermodynamics The study of how heat and other forms of energy are involved in a chemical reaction Enthalpy

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Objectives:

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Presentation Transcript

  1. Objectives: • To be able to: • See where heat is a part of any chemical reaction

  2. Homework • Formal Lab Report due Wednesday 5/25 on Turn It In.com • Complete Worksheet

  3. Definitions • Thermodynamics • The study of how heat and other forms of energy are involved in a chemical reaction • Enthalpy • The stored energy in a substance

  4. Types of Chemical Reactions • Exothermic • A reaction that releases heat • The enthalpy of the system decreases • Endothermic • A reaction that absorbs heat • The enthalpy of the system increases

  5. Heat Energy Changes • When a chemical reaction takes place bonds are broken and new bonds form • Breaking bonds require energy input • Endothermic • Forming bonds release energy • Exothermic • The net change depends on the ratio of heat absorbed and heat released during the breaking and making bonds

  6. More about the Bump • Activation energy • The amount of energy needed to initiate the chemical reaction

  7. Catalyst • Catalyst • Any compound that speeds up a chemical reaction without it self being changed • It lowers the activation energy of the reaction

  8. Catalyst

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