Over 90% of the energy we use comes originally from the sun. (credit a: modification of work by “Pink Sherbet Photography”/Flickr credit b: modification of work by Jeffery Turner) Energy is then used to manufacture those raw materials into useful products, such as cars, skyscrapers, and bridges.įigure 9.2 The energy involved in chemical changes is important to our daily lives: (a) A cheeseburger for lunch provides the energy you need to get through the rest of the day (b) the combustion of gasoline provides the energy that moves your car (and you) between home, work, and school and (c) coke, a processed form of coal, provides the energy needed to convert iron ore into iron, which is essential for making many of the products we use daily. Industrial chemical reactions use enormous amounts of energy to produce raw materials (such as iron and aluminum). We burn a variety of fuels (gasoline, natural gas, coal) to produce energy for transportation, heating, and the generation of electricity. The macronutrients in food (proteins, fats, and carbohydrates) undergo metabolic reactions that provide the energy to keep our bodies functioning. Perform calculations involving heat, specific heat, and temperature changeĬhemical changes and their accompanying changes in energy are important parts of our everyday world ( Figure 9.2).Define and distinguish specific heat and heat capacity, and describe the physical implications of both.Distinguish the related properties of heat, thermal energy, and temperature.Define energy, distinguish types of energy, and describe the nature of energy changes that accompany chemical and physical changes.By the end of this section, you will be able to:
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