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lab 4 postlab

# lab 4 postlab - In Part A of the experiment you tested the...

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In Part A of the experiment, you tested the assumption that the contents of the styrofoam cup were isolated from the rest of universe. a. Which of the following would indicate that the Styrofoam cup is able to isolate the reaction mixture from the rest of the universe? q cold = q warm q cold = -q warm q cold < q warm q cold > q warm The relationship between q cold and q warm cannot prove this. b. Enter the value you obtained for each of the following: q cold water . 5.53 kJ q warm water . -3.82 kJ Calculate the percent difference between these values, using the absolute values of the q's, and treat q cold water as the theoretical value. Report the percent difference as its absolute value. We're concerned with the size (magnitude) of the difference, not its sign. % difference between q's = 30.92 %. In Part B of this experiment, you are relying on accurate mass and T measurements to determine the specific heat of the metal. You are also assuming that the Styrofoam cups isolate the system and surroundings from the rest of the universe. You checked this assumption in Part

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