Energy Changes in Matter Energy: ◦ The ability or capacity to do work. ◦ w = f X d ◦ Work = Force X Distance.

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Presentation transcript:

Energy Changes in Matter Energy: ◦ The ability or capacity to do work. ◦ w = f X d ◦ Work = Force X Distance

Potential Energy Stored energy Examples of potential energy: ◦ Oil sitting in a barrel ◦ Water in a lake behind a dam ◦ This energy is referred to as potential energy, because if it were released, it would do a lot of work.

Kinetic Energy Energy in motion Moving water and wind are good examples of kinetic energy. Electricity is also kinetic energy, even though you can't see it happen, electricity involves electrons moving in conductors. KE = 1 / 2 MV 2 M=Mass V=Velocity

Temperature A measure of average kinetic energy. “A thermometer is a molecular speedometer.” Hotter Temperature Video Link - Temperature and Kinetic Energy

Law of Conservation of Energy Energy can not be created or destroyed. Energy can be converted. PE  KE KE  PE Total amount of energy in a closed system is constant. Conservation of mass:

Heat A measure of the total energy of a system. Measured in Joules (J) and Calories (cal) A form of energy that transfers from one object to another. What is the flow of energy when a cold pack is placed on a leg? Chart Page 15 of text book.

Can two systems have the same temperature but different amounts of heat? Yes, 5 liters and 50 liters of boiling water have the same temperature (100C) but the 50 liter sample, because it has more water, can supply more heat energy.

Phase Changes and Heat Phase Change Diagram (Heating Curve) KE Change PE Change

Heat Endothermic Exothermic

Sublimation/Deposition Solid Gas Deposition Sublimation

Time Endothermic Exothermic Heat

Sublimation/Deposition Youtube Video with Iodine

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