What is “Heat”?. Thermochemistry Heat: the Flow of Energy.

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Presentation transcript:

What is “Heat”?

Thermochemistry Heat: the Flow of Energy

In n Out System Surroundings Heat always flows from a warmer object to a cooler object. Heat IN

In n Out endothermic reaction System Surroundings In an endothermic process, the system gains heat as the surroundings cool down. Heat IN

Examples of Endothermic Process 1.Cooking eggs 2. Melting ice 3. Ice pack

In n Out endothermic reaction System Surroundings Heat always flows from a warmer object to a cooler object. Heat OUT Heat IN

In n Out endothermic reaction System Surroundings exothermic reaction In an exothermic process, the system loses heat as the surroundings heat up. Heat OUT Heat IN

Examples of Exothermic Process 1.Candle flame 2. Eating foods 3. Heat pack

Endothermic? Exothermic? *Law of Conservation of Energy (1 st Law of Thermodynamics): Total amount of energy is conserved before and after the reaction (only forms of energy are changed).