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## Periodic Properties

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**Periodic Properties**Unit 5**Density Trend Lab Grading**• Pre-lab 9 • Data 1 • Graph 5 • Calc. 6 • % Error 2 • Conc. 7 _____________ • Total 30**Post-Lab Write-Up**• Data: 1 Point • Pen (please keep data and observations inside the table!) • Notated changes • Proper Sig. Figs • (I.E. Volume at least 0.1 mL, mass 0.001g) • Graph: 5 Points • Axes/title/ink • Best Fit Line (TO = thru origin) • Interpolating Ge and Extrapolating C (indicate values on y-axis) • Correctly plotted data points (x not .) • Calculations: 6 Points • 2 points for each (Si, Pb, Sn) including volume and density calcs. • Labeled? • Units • Correct sig figs • Percent Error: 2 Points**Conclusion: 7 Points**• In your conclusion you should examine the results of your lab. What values did you determine for the densities of Ge and C to be? Give numeric results = 1 • How were you able to determine the densities of these two elements? Discuss density determination and values for Si, Sn and Pb and interpolation and extrapolation used (I/E) = 3 • Were the results close to what they were supposed to be (examine your percent error)? = 1 • Why did you have error in your lab (be specific ex: don’t say inaccurate measurements; what was inaccurate,why?) ; what could you/would you do differently next time? (2 pts) btw, exact mass does not matter