HEAT the transfer of thermal energy from hot objects to cold objects through collision of particles Units=Joules.

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Presentation transcript:

HEAT the transfer of thermal energy from hot objects to cold objects through collision of particles Units=Joules

Thermal Energy the total kinetic and potential energy of an object Units = Joules

Temperature a measure of the average molecular motion of a substance (if temp is high-KE is high)

Energy Transfer- (3 ways) 1. Conduction – transfer of thermal energy by direct molecular contact with no transfer of matter (materials need to touch) Ex: Your hand will get burnt when you touch a hot burner

2. Convection – transfer of thermal energy by the flowing action within a liquid or a gas. Ex: A furnace circulates warm air to the colder areas of the room

3. Radiation – transfer of energy through space in the form of waves. Ex: Thermal energy from the sun travels through space to the earth

Three Laws of Thermodynamics 1.Energy is conserved in a system. 2.Heat can only flow from cold objects to hot objects when work is done on the system. 3.Absolute zero can never be reached.

Chemical Reactions and Heat Exothermic Reactions-reactions that release heat energy when chemical bonds are broken. Ex.) burning wood, hand warmers

Endothermic- reactions that absorb heat Ex) cold pack

When a substance is heated- The motion of the particles increase The number of collisions increase The volume of the substance increases