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Energy Ability to change or move matter Sources of energy: Energy Types of Energy Potential energy Kinetic energy Thermal energy Energy Types of energy Potential Energy Stored energy Stored in chemical bonds and the possibility of movement Kinetic Energy - Energy of motion - Part 2 of the Kinetic Theory!!! - Solids << liquids << gas Kinetic vs. Potential Energy Energy Thermal Energy - Total amount of kinetic energy - The more particles move, the more kinetic energy, which means the more thermal energy Energy Rank these in order of greatest kinetic energy to least… Carbon Dioxide gas Dry ice Soda Energy Draw an analogy to represent each type of energy… Thermal Energy Also referred to as heat Can be released (exothermic) or absorbed (endothermic) Thermal Energy Is it endothermic or exothermic? Making ice cubes Baking bread Human Digestion Cooking an egg Melting Chocolate Burning a match Formation of clouds Evaporation of water Photosynthesis Heat is given off during a reaction Heat is needed to make a reaction Endothermic/Exothermic When you add thermal energy (endothermic)… When you take away thermal energy (exothermic)… Thermal Expansion Addition of heat results in expansion of substances More kinetic energy in a substance Particles move farther apart Example: If a jar lid is tough to open, you can run it under hot water. Why? Thermal Expansion Lab Do all liquids expand at the same rate? How does a thermometer work? Thermal Expansion Graph Change in Height (cm) Thermal Expansion of Liquids 35 30 25 20 15 10 5 0 Change in Temp Blue Change in Temp Yellow 1 2 3 4 5 6 7 Temp (C) 8 9 10 11