Per9_over

# Per9_over - Preview of Period 9 Energy and Mass 9.1...

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Preview of Period 9: Energy and Mass 9.1 Einstein’s Equation, E = Mc 2 What happens to the mass of a substance that gains or loses energy? 9.2 Nuclear Processes How can an atom’s nucleus change? What is the difference between physical, chemical, and nuclear changes? 9.3 Nuclear Forces What holds nuclei together? 9.4 Nuclear Stability Which nuclei are stable? 9-1

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Forms of Energy Mechanical Energy of Motion: The energy exhibited by objects in motion. Thermal Energy: The unorganized energy of motion of vibrating atoms and molecules. Sound Energy: The organized energy of motion of vibrating atoms and molecules. Electrical Energy: The energy resulting from forces between charged particles. Magnetic Energy: The energy resulting from the forces between magnets. Radiant Energy: The energy resulting from vibrations of charges, such as radio waves, microwaves, or visible light. Gravitational Potential Energy: The energy stored in raised objects, which could fall. Strain Potential Energy: The energy stored in a stretched or compressed spring. Chemical Energy: The energy available in the chemical bonds binding atoms together. Electrical Potential Energy: The energy stored by static electric charges. Nuclear Energy: Energy available in the nuclei of radioactive atoms. 9-1a
Einstein’s Equation relates mass and energy The amount of energy contained in matter equals the mass times c 2 (c= the speed of light) E = M c 2 E = energy (joules) M = mass (kilograms) c = the speed of light = 3 x 10 8 m/s or 186,000 miles/s As we will see, this is probably the most important equation of the 20 th century. 9-2

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Act. 9.1 Einstein’s Equation applied to stored potential energy Does the mass of the radio change when energy is added to its spring?
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