By Richard C Bauer; James P Birk; Pamela Marks
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Extra info for Introduction to Chemistry : a conceptual approach
Nuclear energy involves both light and heat. Energy is released when one element is converted to another, as in a nuclear reactor or in the Sun, where hydrogen atoms fuse to form helium. 13 | Forms of Energy Identify examples of potential and kinetic energy in this picture. Solution: Anything that might move in the picture has potential energy. Kinetic energy is evident in the moving people and vehicles. 13 Identify three additional forms of energy in the photograph. 4 All these forms of energy can be converted into one another.
The turbines spin copper coils inside a magnetic field in a generator to produce an electric current. Energy takes many different forms, and it can be converted from one form to another. Scientists describe two types of energy: kinetic energy and potential energy. Kinetic energy is the energy of motion. 3 Energy and Energy Changes 29 ramp possesses kinetic energy. Potential energy is energy possessed by an object because of its position. The wheelbarrow resting at the top of the ramp has potential energy.
76 at the end of the chapter Why do substances have different densities? Gases, in general, have very low densities because gas particles spread out and occupy large volumes. Metals tend to have high densities because their atoms pack together efficiently. Because ice floats on water, we can infer that water in its solid form must have a lesser density than water in its liquid form. 8 shows how to use molecular pictures to predict relative densities. Water is unique among liquids because its solid form (ice) floats on its liquid form.
Introduction to Chemistry : a conceptual approach by Richard C Bauer; James P Birk; Pamela Marks