Density Lab - or wrote it on the board where everyone could...

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#4.4 DENSITY LAB #3 EXTRA CREDIT Jennie Chang (even) Allison Yee (partner-odd) Makenzy Doniak (3 rd person partner-even) Period 4 September 30, 2010
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CALCULATIONS: 1. Density Division: Equation: density = mass / volume Sample from data: density = 5.64 g / 2.2 ml = 2.6 g/ml 2. Percent Error Equation: True Value – Experimental Value / True Value × 100 = Percent Error Sample from data: 2.7 g/ml – 2.6 g/ml / 2.7 g/ml × 100 = 3.7% 3. Graph (see attachment) 4. Slope Equation: y2-y1/ x2-x1 Sample from data: Aluminum: (9.45-13.5)/(3.3-5.1) = 2.25 Lead: (39.51-36.14)/(3.6-3.2)= 8.425 TABLE OF RESULTS: Aluminum (Al) Lead (Pb) Steel Density 2.6 g/ml 10.79 g/ml 8.07g/ml Percent Error 3.7% 5.0% 0.2% GRAPH: DISCUSSION: This lab was fairly easy and my partners and I finished fairly quickly. However, there were a few improvements that could have been made. 1. Although it was easy and didn’t take much time to do the actual lab, copying down other people’s calculations took a long time, and it might’ve been easier if we had more time,
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Unformatted text preview: or wrote it on the board where everyone could see, rather than crowding around one sheet of paper, where no one can get anything copied down. 2. As we measured the mass on the balance, the decimals would constantly fluctuate. If we tried a different balance, it might have gave us a more precise and accurate determination of the true mass. 3. When we measured out the water in the graduated cylinder, we could have had more people eye it for us, to make sure our more precise, and hopefully accurate, rather than just 2 people eyeing it. CONCLUSION: All in all, I learned that the how to calculate the densities or the metals, and seeing how they were very different. QUESTIONS: 1. What relationship was revealed by your graph? The densities of mass lead and the densities of aluminum are very different. The slope of lead is much steeper than the slope of aluminum....
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Density Lab - or wrote it on the board where everyone could...

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