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UNC-Chapel Hill CHEM 101 - exp 1

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Experiment 1 – Mass Volume and DensityName name Lab Section 432CHEMISTRY 101L REPORT TEMPLATEEXPT.Mass Volume and Density11Materials and Methods.Materials: Buret segment100-mL beakerScaleWater600-mL beakerClampHotplateThermometerHot handsMethods:First weight the buret segment and record the mass of it and then also record the largest volumeincrement on the buret segment Vb. Then fill the buret segment with 5 mL of water and record theinitial volume of water. Clamp buret segment in the 600mL beaker and put it on the hot plate and heatit up along with the thermometer inside. Calculate the volume of water due to displacement. Once thewater reaches 80 degrees Celsius turn the hotplate off, remove the beaker, and then read what it sayson the thermometer and record the corresponding volume. Keep doing this until is reaches 25 degreesCelsius and then weigh the buret segment filled with water. Record mass and then repeat for seconddata set. Results Table 1. Title for table 1Trial 1 Trial 2Mass of buret segment 15.94g 16.01gMass of buret segment filled with liquid 21.06g 20.97gMass of liquid 5.12g 4.96gTable 2. Title for table 2 containing additional information from Data Table 1CorrectedVolume (mL)Trial 1Temperature(C)Trial 1Density(g/mL)Trial 1CorrectedVolume (mL)Trial 2Temperature(C)Trial 2Density(g/mL)Trial 25.25mL 80.1C .98g/mL 5.47mL 80.0C .91g/mL5.21mL 69.8C .98g/mL 5.21mL 70.2C .95g/mL5.15mL 59.9C .99g/mL 5.17mL 60.3C .96g/mL5.05mL 50.1C 1.01g/mL 4.99mL 50.2C .99g/mL5.04mL 40.1C 1.02g/mL 4.96mL 40.4C 1.00g/mL4.96mL 30.1C 1.03g/mL 4.94mL 30.1C 1.00g/mL Figure 1. Title for Figure 1Insert Excel plot of Density vs. Temperature. Include both trials on one graphFigure 2. Title for Figure 2Table 3. Insert title for Table 3Trial 1 Trial 2 Literature ValuesCorrelation coefficient, r .97 .95 .97y-intercept 1.06 1.07 1.01Slope -1.06*10^-3 -1.8*10^3 -4.00*10^-4Average Slope (Trials 1 & 2) -0.0015Percent Error 275%Table 4. Title for Table 4Group 1(current study)Group 2(Section 429)Group 3(Section 429)Group 4(Aaron (Eskew Wed 1)Average Slope -0.0015 -0.0008 -0.0013-0.0010Percent Error 275% 100% 225% 150%Discussion:Insert Excel plot of Density vs. Temperature from Table 1.1 in manualsWrite a discussion to your findings in Experiment 1. Be sure to discuss specifics of your experiment in density, including comparisons to literature values, other groups data and sources of error. Refer to the UNC writing Center at (http://writingcenter.unc.edu/resources/handouts-demos/specific-writing-assignments/scientific-reports#section-22) for some help. This should be no longer than 2 paragraphs.In this experiment our findings were off by a significant amount when compared to the literature values. We did learn however how to measure the density of water at room temperature as well as how to examinethe effects of temperature on density. When compared to other groups one was closer to the literature value while others, like us, were significantly off. We were the most off however. We have found though, like in the literature value,that the density did continue to decrease as the temperature increased. Perhaps what was wrong was how we measured it but in general at least it was similar. The other groups who were off by a bit probably had a similar problem or perhaps just simply the temperatures that we all took the measurements at were still a little off from the exact temperatures used inthe literature value. Furthermore, we did not use as many values of density and temperatures as the literature value. In addition, there could’ve been flaws with the experiment itself. In conclusion, the results we got were off however we learned from our errors also the errors in the experiment. Our data when compared to the other groups proves how we were off and furthermore the literature data proves that the other groups were off as well by a significant amount. This experiment shows the importance of accuracy and precision as well as how many trials should be done in order to get accurate


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UNC-Chapel Hill CHEM 101 - exp 1

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