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Category > Biology Posted 21 Nov 2017 My Price 12.00

lab assignment

Hello I was wondering could you help me with another lab assignment? You were such a great help with the previous lab, I would really appreciate your help again

 

Lab 4 – Energy Sources and Alternative EnergyExperiment 1: The Effects of Coal MiningCoal mining, particularly surface mining, leads to large areas of land being temporarilydisturbed. Mines collect and conduct water that is in contact with pyrite, a mineral that producesiron and sulfuric acid when exposed to air and water. Limestone is often used to mitigate theeffects of pyrite on water. In this lab, you will see first-hand the reasons why mine drainage canbe harmful to the local drainage system if left untreated.POST-LAB QUESTIONS1.Develop hypotheses predicting the effect of pyrite and limestone on water acidity? Whywould you predict these effects?a.Pyrite hypothesis =b.Limestone hypothesis =Table 1: pH of Water SamplesWater SampleInitial pHFinal pHPyriteLimestoneWater2.Based on the results of your experiment, would you reject or accept each hypothesisthat 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
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4.Based on your data, why would you use limestone to treat acid mine damage? Utilize atleast one scholarly resource to support your suggestions.Answer =© eScience Labs, 2016
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Experiment 2: Solar EnergyThe sun’s energy is free, plentiful, non-polluting, and can be converted into electricity with theuse of photovoltaic cells. Also called a solar cell, these panels capture sunlight and emit a currentthat can be used to power many things, including the small motor attached to the solar panel inyour kit. In this experiment, you will investigate how the amount and wavelength of light affectthe generation of electricity.Post-Lab Questions1.Develop hypotheses predicting the efficiency of solar energy from direct sunlightagainst 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 ResultsEnvironmentalDescriptor/VariableObservations(Each should be compared against direct subnlight)WeatherMotor speed in directsunlightVFFMSNMMotor speed at 45 degreeangleVFFMSNMMotor speed with 25%shadedVFFMSNMMotor speed with 50%shadedVFFMSNMMotor speed with 75%shadedVFFMSNMMotor speed underreflectorsVFFMSNMMotor speed under redfiltrationVFFMSNMMotor speed under blueVFFMSNM© eScience Labs, 2016
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filtrationMotor speed under greenfiltrationVFFMSNMMotor speed under yellowfiltrationVFFMSNM2.Based on the results of your experiment, would you reject or accept each hypothesisthat 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 youknow this based on your data?Answer =4.How could you increase the electricity generated by a solar cell during the day when thesun’s angle is constantly changing?Answer =5.Based on your data, could adding filters to solar panels increase the solar energyproduced?Explain how you know this.Answer =ReferencesAny sources utilized should be listed here.© eScience Labs, 2016
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Status NEW Posted 21 Nov 2017 07:11 AM My Price 12.00

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