# Solution-Effect of pyrite and coal on the acidity of water | Homework Help

Lab 4 – Energy Sources and Alternative Energy

Experiment 1: The Effects of Coal Mining

Don't use plagiarized sources. Get Your Custom Essay on
Solution-Effect of pyrite and coal on the acidity of water | Homework Help
For \$10/Page 0nly
 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?

4.      What can be done to prevent mine drainage from damaging the ecosystem?  Utilize at least one scholarly resource to support your suggestions.

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 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 filtered accept/reject =

3.      Does increased exposure to the sun’s light produce more current? Explain how you know this based on your data?

4.      How could you increase the electricity generated by a solar cell during the day, when the sun’s angle is constantly changing?