CHEM 111 Lecture Notes - Lecture 16: Joule
21 Dec 2015
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When objects at different temperatures come into contact, heat flows from the hotter to the cooler until the temperatures are the same. Heat lost by the hot body = heat gained by the cooler body. 12 g of copper at 12. 0oc is placed in 5. 0 g of ethanol at 68. 0oc. What is the final temperature? ccopper cethanol q=cxmx t. Start with 500 g of ice and heat. It melts, then warms up and eventually boils, then steam heats up. If we plot temperature as a function of the heat input, we get the heating. Curve. but (a) the plot is not a curve and (b) does not increase continuously. Ice - water system involves bonds between the molecules. We go from stronger in ice to weaker in water, and so heat is taken in. In an endothermic reaction: heat is transferred from the surroundings, strongly bonded molecules are converted to weakly bonded molecules.
