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 |5 |6 | |Activated Carbon |6 |7 | |Water |5 |5 | POST LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? a. Pyrite hypothesis = Pyrite will contaminate the water source making it more acidic. b. Coal hypothesis = Coal will contaminate the water source making it more acidic.
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 |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 = If pyrite is introduced to the water, then it will be more acidic. b. Coal hypothesis = If coal is introduced to the water, then the ph level will stay the same.
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 Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? Pyrite hypothesis = I would guess ph would be lower. Coal hypothesis = I would guess ph would be higher. 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.
In 2013 AD, CO2 in the atmosphere is 396 ppm. 1. What was the percent of atmospheric CO2 in 1850? Move the decimal place 4 digits to the left to get percent (%) 2. Hopefully you will live until the end of this century - 2100; what will be the amount of CO2 in the atmosphere in 2100 assuming there is no change in the emissions rate of 2 ppm/year?
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 | | | Activated Carbon | | | Water | | | 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?
Reactions Lab David Vaghari INSTRUCTOR: Dr. Chernovitz Monday, July 23, 2012 Oxygen Production Introduction In this lab, potassium chlorate will be decomposed producing oxygen gas and potassium chloride. The hypothesis is that the reaction will yield 3.916 grams of oxygen gas. Materials Test tube 10 grams potassium chlorate Bunsen burner Procedure Step 1. Obtain a test tube, place a 10 gm of potassium chlorate. Step 2.
We repeated thus experiment twice with each fuel, using clean water each time. Results Temp Of Water Alcohol Mass of alcohol Energy In Energy Out Before After Before burn After burn 26 46 Methanol 173.88 163.02 246386 408 25 45 Ethanol 163.98 162.80 35651 408 25 45 Propanol 157.73 156.82 30651 408 25 45 Brutanol 168.52 167.82 25,313 408 Calculations for energy in Calculations for energy out (Mass x enthalpy for substance) (Mass of water x enthalpy for substance x Mole temperature) 10.86 x 726, 000= 246,386.25 100 x 4.18 x 20= 408 32 1.18 x 1367, 000= 35,066.5217 46 0.91 x 2021, 000= 30,651.8333 60 0.7 x 2676, 000= 25,313.5135 74 Efficiency calculations Methanol = 408 x 100 = 0.16% Propanol= 408 x 100= 1.33% 246,386 30651 Ethanol= 408 x 100= 1.16% Bruntanol= 408 x 100= 1.61% 35066 25313 Accuracy As we can see all
Hydrate Lab The purpose of this lab is to analyze the percent water in a crystalline hydrate and to indentify the hydrate from a list of possible unknowns. The solid hydrate will be heated to remove the water, and the percent can be found by measuring the mass of the solid before and after heating. The hydrate will be indentified by comparing the percent water in the hydrate with the percent water calculated for the possible unknown. Before the lab there are pre-lab questions: 1. Describe the three general safety rules for working with a Bunsen burner.
The average bulb life of an incandescent bulb is 750-1000 hours, while the average bulb life of an LED bulb is anywhere from 25,000-50,000 hours (n.d. staticbrain.com). At the assumed 3 hours per day usage, that bulb should last you between 22 to 45 years. Incandescent bulbs burn out much faster because as the filament heats up, the tungsten that coats it evaporates, until eventually the filament gets so thin that it breaks. At $1.50 a bulb for an incandescent and $10 a bulb for an LED, the LED bulb will pay for itself in a little over 6 years, just due to its longevity. Another advantage to longer bulb life is when replacing the bulbs in those hard to reach areas like at the top of a stair case or cathedral ceiling, imaging only needing to replace those bulbs every 45 years.
In Ohaake in New Zealand about 320 gm of C02 is produced for each KW hour of electricity produced against 950 to 960 gm. if coal was used. Limitations Geothermal energy is a proven economical resource with energy technology. It has some environmental problems: 1. The steam brings hydrogen sulphide gas to the surface and pollutes the air unless controls are instituted.