Lab Experiment #4 Essay

617 WordsMar 14, 20143 Pages
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 4 Activated Carbon 7 8 Water 7 7 POST LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? a. Pyrite hypothesis = If pyrite is added to a beaker with 100mL of water, then it will reduce the pH over 48 hours. b. Coal hypothesis = It activated carbon is added to a beaker with 100mL of water, then it will increase the pH over 48 hours. 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.…show more content…
Develop hypotheses predicting the efficiency of solar energy from direct sunlight against the 4 variables tested? Direct vs indirect hypothesis = If the solar panel is faced towards direct sunlight, then the motor will move faster. Direct vs reflected hypothesis = If the solar panel is faced towards a reflected sunlight, then the motor will move slower. Direct vs shaded hypothesis = If the solar panel is placed in a shaded location, then the motor will not move at all. Direct vs filtered hypothesis = If solar panel is covered with a colored filter, then the motor will either move the same or slower depending on the color. 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