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Thermochemistry Feel the Heat!.

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Presentation on theme: "Thermochemistry Feel the Heat!."— Presentation transcript:

1 Thermochemistry Feel the Heat!

2 Heat q is the symbol for heat in equations
Heat always flows from a warmer object to a cooler object, and will continue to flow until the temperature of both is the same Law of conservation of energy: energy is neither created nor destroyed Exothermic vs. endothermic

3 Heat: units Calorie (dietary)=1 kilocalorie Heat flow
calories joules Heat capacity: the amount of heat needed to increase the temperature of an object 1°C Specific heat: the amt. of heat to raise 1 g of a substance 1°C

4 Heat: calculations q=mcΔT, on your tables!
LABEL EVERYTHING! Then you will be able to tell where it belongs, that your units cancel out properly, so that your calculated answer is correct!

5 Enthalpy Enthalpy: the heat content of a system at constant pressure
Calorimetry: the measurement of heat flow into or out of a system for chemical or physical properties Calorimeter: an insulated device to measure the heat released or absorbed during the process

6 Heat of reaction orin changes of state
Heat of reaction: the enthalpy change for a chemical equation as written Heats of fusion/solidification: reverse of each other Heats of vaporization/condensation: same Heat of solution: release or absorption of heat when a solute dissolves in a solvent


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