Ch 10 - Energy.

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Presentation transcript:

Ch 10 - Energy

KE = ½ mv2 The Nature of Energy Energy is the ability to do work or produce heat/light. Potential Energy is energy due to position Kinetic Energy is energy due to motion (depends upon mass and velocity) KE = ½ mv2

Temperature vs Heat Temperature is the measure of the average kinetic energy in a system. (measure the motion of the particles) Heat is the sum of the particle kinetic energy in a system. Temperature and heat are NOT how hot or cold something is…….they are measuring energy in a system……

Thermodynamics Exothermic and Endothermic Reactions Exothermic reaction occurs when energy flows out of a system into the surroundings. (feels hot to the touch) Endothermic reaction occurs when energy flows from the surroundings into a system. (feels cold to the touch)

Measuring Energy Changes The amount of energy gained or lost during a chemical reaction can be calculated: q = (mass)(change in Temperature)(Specific heat) q = m∆TCp q is measured in Joules or kilojoules and is the amount of energy lost or gained m is mass, measured in grams Change in temperature (∆T) is final temp – initial temp Specific heat (Cp) is a constant. It is the amount of energy needed to raise the temp of 1 g of a substance 1oC

First Law of Thermodynamics Also called …….. Law of Conservation of Energy Energy can not be created or destroyed, it can only change form….. q lost = q gained Energy lost must be absorbed (or gained)