Lab 4 – Energy Sources and Alternative Energy
Experiment 1: The Effects of Coal Mining
| Table 1: pH of Water Samples | ||
| Water Sample | Initial pH | Final pH (24-48 hours) |
| Pyrite | 6 | 6 |
| Activated Carbon | 6 | 7 |
| Water | 6 | 6 |
POST LAB QUESTIONS
1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water?
a. Pyrite hypothesis =
b. Coal 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.
a. Pyrite hypothesis accept/reject =
b. Coal 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.
Answer =
Experiment 2: Solar Energy
| Table 2: Solar Energy Experiment Results | |
| Environmental Descriptor/Variable | Observations (Each should be compared against direct subnlight) |
| Weather of the Day | Sunny, 70 degrees, winds NW@ 6 mph |
| Motor speed in direct sunlight | Medium |
| Motor speed at 45 degree angle | Medium |
| Motor speed under reflectors | Medium |
| Motor speed with 25% shaded | Medium |
| Motor speed with 50% shaded | Medium |
| Motor speed with 75% shaded | Medium |
| Motor speed under red filtration | Medium |
| Motor speed under blue filtration | Medium |
| Motor speed under green filtration | Medium |
| Motor speed under yellow filtration | Medium |
Post-Lab Questions
1. Develop hypotheses predicting the efficiency of solar energy from direct sunlight against the 4 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 =
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 aIDing filters to solar panels increase the solar energy produced? Explain how you know this.
Answer =
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