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Lab 4 – Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining

Question # 00590479
Subject: Biology
Due on: 09/18/2017
Posted On: 09/18/2017 09:15 AM

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.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
S
NM
sunlight
Motor speed at 45 degree
VF
F
M
S
NM
angle
Motor speed with 25%
VF
F
M
S
NM
shaded
Motor speed with 50%
VF
F
M
S
NM
shaded
Motor speed with 75%
VF
F
M
S
NM
shaded
Motor speed under
VF
F
M
S
NM
reflectors
Motor speed under red
VF
F
M
S
NM
filtration
VF
F
M
S
NM
Motor speed under blue © eScience Labs, 2016 filtration
Motor speed under green
filtration
Motor speed under yellow
filtration VF F M S NM VF F M S NM 2. Based on the results of your experiment, would you reject or accept each hypothesis
that you produced in question 1? Explain how you determined this.
Direct vs indirect accept/reject =
Direct vs reflected accept/reject =
Direct vs shaded accept/reject =
Direct vs filtered accept/reject =
3. Does increased exposure to the sun’s light produce more current? Explain how you
know this based on your data?
Answer = 4. How could you increase the electricity generated by a solar cell during the day when the
sun’s angle is constantly changing?
Answer =
5. Based on your data, could adding filters to solar panels increase the solar energy
produced? Explain how you know this.
Answer = References
Any sources utilized should be listed here. © eScience Labs, 2016


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Lab 4 – Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining

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