Posted: December 7th, 2019
Ashford University SCI 207 — 207 – Lab 4 â Energy Sources and Alternative Energy
Lab 4 â Energy Sources and Alternative Energy
Experiment 1: The Effects of Coal Mining
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Table 1:
pH of Water Samples
Water
Sample
Initial
pH
Final pH
(after 48 hours)
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Pyrite
5 pH
Activated
Carbon
5 pH
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Water
5 pH
POST LAB QUESTIONS
1.
Develop
hypotheses predicting the effect of pyrite and coal (activated carbon) on the
acidity of water?
a.
Pyrite hypothesis =
b.
Coal (activated carbon)
hypothesis =
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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.
a.
Pyrite hypothesis
accept/reject =
b.
Coal (activated carbon)
hypothesis accept/reject =
3.
Based
on your data, what effect do you predict coal mining has on the environment?
Answer =
4.
What
can be done to prevent mine drainage from damaging the ecosystem? Utilize at least one scholarly resource to
support your suggestions.
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Answer =
Experiment 2: Solar Energy
Table 2: Solar
Energy Experiment Results
Environmental
Descriptor/Variable
Observations
(Each should
be compared against direct sunlight)
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Weather
of the Day
Motor
speed in direct sunlight
Motor
speed at 45 degree angle
Motor
speed under reflectors
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Motor
speed with 25% shaded
Motor
speed with 50% shaded
Motor
speed with 75% shaded
Motor
speed under red filtration
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Motor
speed under blue filtration
Motor
speed under green filtration
Motor
speed under yellow filtration
Post-Lab Questions
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1.
Develop
hypotheses predicting the efficiency of solar energy from direct sunlight
against the four variables tested?
Direct vs
indirect hypothesis =
Direct vs
reflected hypothesis =
Direct vs shaded
hypothesis =
Direct vs
filtered hypothesis =
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 =
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3.
Does
increased exposure to the sunâs 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 sunâs angle is constantly changing?
Answer =
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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.
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