U4-14 TITLE Predicting Periodic Properties PURPOSE To predict the density germanium using calculated densities for silicon, tin, and lead. HYPOTHESIS The density of germanium will be _____ g/mL.

U4-14 DATA TABLE Silicon Tin Lead Mass of weigh boat 10.0 g Mass of weigh boat + sample 21.7 g 68.1 g 65.6 g Volume of water 10.5 mL 14.0 mL 20.5 mL Volume of water + sample 15.6 mL 22.0 mL 25.4 mL Silicon: 2.33 g/mL Tin: 7.31 g/mL Lead: 11.34 g/mL

U4-14 CALCULATIONS: Show ALL work!! Silicon Tin Lead MASS of sample VOLUME of sample DENSITY of sample

U4-14 GRAPH: Density vs. Period Number Identify variables Independent variable Dependent variable Calculate range (starting and ending) for each axis x-axis y-axis Scale for each axis Increments for each axis Label each axis (name and unit) Plot points Draw best-fit line Title the graph (see above)

U4-14 CONCLUSIONS Use the graph to predict the density of germanium. What is the period number for germanium? Predicted density: __________ g/mL The accepted density of germanium is 5.5 g/mL. What is the formula for percent error? Calculate the percent error using your predicted density as the experimental value. Calculate the percent error using your hypothesized density as the experimental value.