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Unformatted text preview: Experiment #1: Conservation Laws A. SUMMARY In Part A of this experiment we showed that the same volume of water added to a flask will create very similar changes in weights. Next, we showed that acetone will have similar effects. Therefore, mass is conserved when transferred from one container to another. In Part B of this experiment we showed that different chemicals put together maintain mass and volume. Using water as a control you can see that other than the difference in density causing weight difference the trend is very similar between the two experiments. B. RESULTS Part A: Water: MEASUREMENT Empty Beaker Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Acetone: MEASUREMENT Empty Beaker Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Part B: Water + Water: MEASUREMENT Volume 1 (mL) Empty Beaker 0.0 Trial 1 5.4 Trial 2 5.7 Trial 3 6.0 Volume 2 (mL) 0.0 10.1 10.1 10.1 Mass (g) 68.1579 78.1030 78.1096 78.1022 NET MASS (g) 48.8745 53.8090 58.7452 63.7027 68.6651 73.6136 MASS LIQUID (g) 0.0 4.9345 4.9362 4.9575 4.9624 4.9485 VOLUME (mL) 0.0 5.0 10.0 15.0 20.0 25.0 NET MASS (g) 48.8824 52.7300 56.6237 60.5080 64.3760 68.2682 MASS LIQUID (g) 0.0 3.8476 3.8937 3.8843 3.8680 3.8922 VOLUME (mL) 0.0 5.0 10.0 15.0 20.0 25.0 Water + Acetone: MEASUREMENT Volume 1 (mL) Empty Beaker 0.0 Trial 1 5.5 Trial 2 5.5 Trial 3 5.4 C. CALCULATIONS Volume 2 (mL) 0.0 10.0 10.1 10.0 Mass (g) 68.1821 77.2104 77.2238 77.1845 Density = Mass / Volume Density = 4.9345 g / 5.0 mL :: Density = .9869 g/mL D. DISCUSSION In the first part of this experiment we tested to see if mass is conserved when two liquids are mixed. By conducting five trials it was shown that the results were reproducible, and the trends between measurements of adding water to itself were relatively the same. The only variation between weights must be that the measurements added were not precise enough for the method of measuring the mass of the liquid. The trends between measurements of adding acetone to itself were relatively the same as well. The variation in weight depended upon the density of acetone being less than that of water. Again with the acetone the only variation between weights must be that the measurements added were not precise enough for the method of measuring mass. In the second part of the experiment we mixed two different liquids to test if mass and volume would both be conserved. By adding the same substance to itself and repeating the processes, to preserve reproducibility, you can see that volume is conserved when it is the same substance. By adding water and acetone together one can see that by adding two different substances together volume is conserved as well. By reversing the order of adding the two substances together, you can also see that no matter what order the substances are added the same the same outcome will occur. ...
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This note was uploaded on 04/21/2008 for the course CHEM 107 taught by Professor Generalchemforeng during the Fall '07 term at Texas A&M.
- Fall '07