Density of Mineral accepted values and FD info for EM test question

Students have conducted data collection for the lab in class and they have been told they may complete the final draft at home (recommended) or they may do the FD in class during the EM Test (four questions timed at 60 minutes total).

Lab Final Draft requirements (EM test question # 4)

Data Table:  make a ruled data table to record your measurements and observations.


Analysis:

1. Show your calculations for the density of each mineral sample
2. Make a bar graph that compares your calculated density for each mineral sample to the accepted density of the mineral samples provided by your teacher.  Graph the mineral samples from least dense to most dense.
3. Make a diagram that shows the crust, mantle, outer core and inner core of the Earth and label where the minerals identifed in your lab would be found based on Density alone.

Conclusion:  The following are prompts to help you write a conclusion.  Write you conclusion using complete sentences and the rubric.

Frame work: Were you able to identify the unknown minerals by calculating their density?  If not, how did you identify the samples?  Evidence: Compare the accuracy of your density calculations to the accepted densities, USE NUMERIC EVIDENCE.  Logic:  How does your measured mineral densities compare to the class average and the actual densities?  Error:  How did error influence your calculated densities? Mention more then one source of error and its impact on data Next Step:  What could be done to improve/further investigate this experiment and why might this lab be useful to society at large?

Accepted DensityValues (mineral name, density and other properties)

Sulfur 1.96g/cm³    opaque, yellow color smells of rotten eggs

Calcite 2.7g/cm3 colorless, monoclinic crystal clear translucent – yellow-whitish opaque Calcium Carbonate

Granite 2.5-2.89 g/cm³  composite rock with smaller crystals black, grey, white and possible green or pink;  mostly silicate dioxides

Hematite  5.26g/cm³   black – reddish color, may have rust mostly iron oxides

Pyrite   5.1g/cm³ metallic yellow maybe shiny can have cubic crystals iron sulfide compounds

Galena 7.5 g/cm³  shiny metallic silver cubic crystals may have yellow sulfur or black material attached a lead sulfide

Milky quartz ~2.6 g/cm³  clear –white-rosy color, looks like rock sugar

Magnetite   5.2 g/cm³  Black/sparkles-metallic/shiny magnetic (will influence a compass needle)   iron oxides

Garnet 3.4-3.7 g/cm³  red-brown-tawny-white, glassy with conchoidal fracture

Olivine  3.3 g/cm³     green with cubic crystals a silicate

Average density by interior layer

Continental Crust:    2.7 to 3.0

Oceanic Crust:        3.0 to 3.3

Mantle (silicates):   3.3 to 5.7 (increasing with depth?)

Outer Core (liquid):  9.9 to 12.2

Inner Core (solid):  12.6 to 13.0