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

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Presentation on theme: "What is “Heat”?. Thermochemistry Heat: the Flow of Energy."— Presentation transcript:

1 What is “Heat”?

2 Thermochemistry Heat: the Flow of Energy

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

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

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

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

7 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

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

9 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).

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