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Chapter 6 outline - II 6.2 Conservation of Energy a First...

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Chapter 6- Energy and Chemical Reactions Chemical reactions involve transfers of energy. This required knowledge of thermodynamics, the science of heat, work, and transformations of one to the other. March’s definition: Study of energy changes or transfers that accompany chemical and physical processes. I. Chapter 6.1 The Nature a. Energy - (represented by E) the capacity to do work 1. Types of Energy : (Internal Energy) a. Kinetic Energy - energy that something has because it is moving b. Chemical Potential - how much energy is stored also energy that something had as a result of its position and some force that is capable of changing that position i. Potential energy can be calculated in different ways, depending on the type of force involved ii. Potential energy can be converted to kinetic energy, and vice versa c. & energy related to intermolecular interactions ii. Units of Energy- Joule 1. 1 J= 1 kg m 2 /s 2 2. 1 kJ= 1000 J iii. Another energy unit is calorie 1. 1 cal- 4.184 J 2. Calorie is not the same as a food calorie that is a kilocalorie.
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Unformatted text preview: II. 6.2 Conservation of Energy a. First Law of Thermodynamics or Law of Conservation of Energy- Energy is neither created nor destroyed in ordinary chemical reactions and physical changes- the total amount of energy in the universe is constant. i. When a force acts on an object and moves the object, the change in the object’s kinetic energy is equal to the work done on the object. ii. Work is also requited to increase the potential energy of an object. iii. The work done on an object corresponds to the quantity of energy transferred to that object; that is doing work (or working) on an object is a process that transfers energy to an object. b. Energy, Temperature, and Heating i. Heat- refers to the energy transfer process that happens where ever two samples of matter at different temperatures are brought into contact. Energy always transfers from the hotter to the cooler sample until both are the same temperature...
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Chapter 6 outline - II 6.2 Conservation of Energy a First...

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