Chapter_4_part_1.01 - Introduction Chapter 4 Part 1:...

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1 Chapter 4 Part 1: Identifying and Using Energy Introduction • Everything known to man is either matter or energy. • Up to now, we have studied matter. • This chapter studies energy. Objectives • Distinguish between energy and matter. • Distinguish between energy and heat. • Be able to convert among energy units. • Apply the terms exothermic, endothermic, and activation energy to chemical systems. • Distinguish between temperature and heat. • Convert among the temperature scales. Objectives • Describe the difference between the potential energy and kinetic energy of any system, even chemical systems. • Define work and distinguish it from other forms of energy. • Discuss heat flow and its value to machines and sources of power. • List and describe the various ways to produce work. • Understand heat content and specific heat. Calculations •Wo rk • Energy units conversions • Temperature conversions • Bond energy • Heat of combustion • Specific heat Classifications • Matter – Has mass and takes up space – Protons, electrons, neutrons –A toms – Molecules – People –P lane ts –E tc . • Energy – Does not have mass, takes up no space – Electromagnetic – Sound – Mechanical Energy &
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2 Rules of Energy • Law of Conservation of Energy – Energy is neither created nor destroyed • (in normal chemical or physical processes) – Energy is conserved ( KE + PE = constant) • Implications – Energy can change forms. – Energy can be stored. – Energy can be shared, or transferred Energy Conversions • Energy can change forms – Motion (kinetic energy) to heat – Motion to sound – Sound to motion – Stored (potential) energy to energy of motion (kinetic) Energy can be shared, transferred • Examples: – People or molecules bumping into each other • Recall this impacted global warming – Cooking on stovetop – IR to vibration – Photoelectric effect Energy can be stored • Potential energy – Ex. Chemical Energy • Examples:
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This note was uploaded on 05/10/2008 for the course CH 304k taught by Professor Walker during the Spring '08 term at University of Texas at Austin.

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Chapter_4_part_1.01 - Introduction Chapter 4 Part 1:...

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