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# L23 - Changes in PE result in changes in KE Lecture 23 The...

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Lecture 23 The Heat is On: Heat Capacity Key Idea: Substances differ in their response to heat transfer. Larger KE Negative PE Largest KE Most negative PE H 2 and O 2 H 2 O Changes in PE result in changes in KE Stronger bonds = more negative PE KE for isolated system increases as PE decreases KE can be transferred to the surroundings as heat Point of View Heat in = endothermic Temperature increases Heat in = endothermic Temperature decreases Physical Change Chemical Change surroundings = 25°C Heat out = exothermic Temperature decreases Heat out = exothermic Temperature rises Kinetic Energy, Temperature, and Heat 1 . Compare a cup of water to a gallon jug of water. Assuming they are the same temperature, the total heat is best compared in which way: A. They transfer the same total heat B. The cup of water transfers more total heat C. The gallon of water transfers more total heat. 2 . Compare a cup of water at 25ºC and a cup of water at 85ºC. Assuming they have the same mass, the total heat is

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L23 - Changes in PE result in changes in KE Lecture 23 The...

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