1. 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.

2. 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: g/mL

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

4. 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)

5. 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.