13 Jan .494px;=”” block;=””>Exper
.494px;=”” block;=””>Experiment 1: The Effects of Coal Mining
Coal mining, particularly surface mining, leads to large areas of land being temporarily
disturbed. Mines collect and conduct water that is in contact with pyrite, a mineral that produces
iron and sulfuric acid when exposed to air and water. Limestone is often used to mitigate the
effects of pyrite on water. In this lab, you will see first-hand the reasons why mine drainage can
be harmful to the local drainage system if left untreated.
POST-LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and limestone on water acidity? Why
would you predict these effects?
a. Pyrite hypothesis =
b. Limestone hypothesis = Water Sample
Pyrite
Limestone
Water Table 1: pH of Water Samples
Initial pH Final pH 2. Based on the results of your experiment, would you reject or accept each hypothesis
that you produced in question 1? Why?
a. Pyrite hypothesis accept/reject =
b. Limestone hypothesis accept/reject = 3. Based on your data, what effect do you predict coal mining has on the environment?
Answer = © eScience Labs, 2016 4. Based on your data, why would you use limestone to treat acid mine damage? Utilize at
least one scholarly resource to support your suggestions.
Answer = © eScience Labs, 2016 Experiment 2: Solar Energy
The sun’s energy is free, plentiful, non-polluting, and can be converted into electricity with the
use of photovoltaic cells. Also called a solar cell, these panels capture sunlight and emit a current
that can be used to power many things, including the small motor attached to the solar panel in
your kit. In this experiment, you will investigate how the amount and wavelength of light affect
the generation of electricity.
Post-Lab Questions
1. Develop hypotheses predicting the efficiency of solar energy from direct sunlight
against the four variables tested.
Direct vs indirect (at an angle) hypothesis =
Direct vs reflected (using aluminum foil reflector) hypothesis =
Direct vs shaded (covering the solar panel) hypothesis =
Direct vs filtered (using color filtration) hypothesis = Table 2: Solar Energy Experiment Results
Environmental
Observations
Descriptor/Variable
(Each should be compared against direct subnlight)
Weather
Motor speed in direct
VF
F
M
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