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 (after 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 (activated carbon) on the acidity of water? a. Pyrite hypothesis = The pyrite will probably dissolve a bit and increase the ph of the water b. Coal (activated carbon) hypothesis = The activated carbon will probably increase the ph of the water as it dissolves and releases chemicals into the water 2. Based on the results of your experiment, would you reject or accept each hypothesis that you produced in question 1?
INT1 – Task Two Author Note Section A Problem Statement: This experiment is designed to determine the relative resistance of copper wire as temperature changes in order to gauge the effect, if any, that global warming will have on the cost of the delivery of electricity Relevance: Global warming is expected to have a major effect on the ecosystems of the world. Could global warming also affect the efficiency of the delivery of electrical energy and, if so, what is the magnitude of even a small increase in global temperatures? A1. Literature review: In the article on Temperature and Conductivity (Khounsary, 2005): The researcher comments on if temperature would affect the amount of current traveling through a wire. Dr Khounsary explains an experiment using a fixed voltage and varying the temperature of the wire using a torch.
Experimental Procedure: 250 mL of the copper solution was made by creating 100 mL of the solution, reacting CuO with HNO3, and then diluting to the mark of 250 mL. Using this stock solution, different concentrations were made and placed in the sprectrometer for observation. The absorbances and transmittances were recorded for use when identifying the amount of the color-absorbing copper ions later. A graph was plotted of Absorbance v. Molar Concentration easily see the results of the experiment. Pre-Lab Questions: 1.
Kristie E. Bader Photosynthesis versus Solar Cell SCI 115 – Introduction to Biology October 30, 2011 Tamara Allen Strayer University Photosynthesis and semi-conductor solar cell both are processes in order to harness energy for use. These methods of harnessing and utilizing the sun’s energy are similar. There are also differences as well in what the energy is used for. Some similarities of photosynthesis and semi-conductor solar cells are: both use sunlight and water molecules and produce a form of energy. Semi-conductor solar cells use photovoltaic or photoelectric cells and photosynthesis uses chlorophyll to harness sunlight.
Light energy has a major role in this process. Without this energy, photosynthesis is not possible to occur. In this experiment, I will find out the correlation between light energy, rate of carbon dioxide, and rate of photosynthesis. I will place the beaker containing the plant in three different distances and measure the resulting bubbles oxygen produced. The number bubbles produced shows the affect of light energy to the rate of photosynthesis.
Design Lab-Chemistry HL Date; 27th February and 1st March 2013 Grade 11 Increasing the temperature to increase the rate of reaction between sulfuric acid and iron powder Experiment; To investigate the effect of temperature of reactants on the rate of reaction Focus Question; How does temperature (30, 35,40,45,50 degrees Celsius) affect the rate of reaction of H2SO4 (1.0M, Volume; 20ml) and Fe (2.5g) in 6 minutes? Fe (s) + H2SO4(l) FeSO4(l) + H2(g) Variables; Independent Variable- Temperature Dependent Variable- how much hydrogen gas is produced Controlled Variable-Sulfuric Acid (1.0M, Volume; 20ml), Iron powder (2.5g), and time (6 minutes) Materials; 3 100ml Flasks 1 cork 1 tube 1 100ml graduated cylinder 1 25ml graduated cylinder 1 clamp stand 1 spatula 1 apron A pair of gloves 1 dropper 1 tub of water 1 waterbath 1 balance scale Stopwatch 3 pieces of paper 2 thermometers 37.5 grams of Iron Powder (Fe) 300 ml of 1.0M H2SO4 Procedure; 1. Wear an apron, gloves and goggles for safety reasons 2. Obtain all materials which are 3 100ml flasks, 1 cork, 1 tube, 1 100ml graduated cylinder, 1 25ml graduated cylinder, 1 clamp stand, 1 spatula, 1 dropper, 1 tub of water, 1 waterbath, 1 balance scale, 1 stopwatch, 2 thermometer to your work place 3. Then obtain 37.5 grams of iron powder, and 300 ml of 1.0M H2SO4 to your work place 4.
Testing the Albedo of Earth’s Major Surface Substances Aidan Walsh Mrs. Bell SNC2D Wed. 14, 2012 PURPOSE: To test the relationship between each major surface substance’s albedo and climate. QUESTION: What is the relative albedo of each individual substance tested? HYPOTHESIS: I predict that the soil and leaves will have a lower albedo than the ice or water, which will have a high albedo. EXPERIMENTAL DESIGN: First, we gathered material that we thought would represent major surface substances on Earth. Then we placed each substance under a heat lamp which represented the energy from the sun, and proceeded to measure the difference in temperature for each over the time period exposed to the light energy.
http://whyfiles.org/238earthday/ Use this link to answer the questions that follow: 4. What is increased burning of fossil fuels doing to our ocean? 5. What could happen if pteropods die off? 6.
Lab 4 – Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining |Water Sample |Initial pH |Final pH (24-48 hours) | |Pyrite |7 |4 | |Activated Carbon |7 |8 | |Water |7 |7 | POST LAB QUESTIONS Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? Pyrite hypothesis = If the pyrite is left in a warm climate in water for 48 hrs, then it will have a higher pH then the initial Coal hypothesis = If the Coal is left in a warm climate in water for 48 hrs, then it will have a lower pH then the initial 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. Pyrite hypothesis accept/reject = Reject. According to the pH balance strips, my pyrite recorded a significantly lower pH of 4.
The indictor DCPIP can determine the rate of photosynthesis. DCPIP is able to capture the electrons that are transferred through the electron transport chain will cause the intensity of the indicator to decrease. The decrease of the indicator associates to an increased rate of photosynthetic activity (Miyazaki et al. 2012). It was hypothesised that the isolated chloroplasts from silverbeet leaves exposed to while light (Tube 3); the tube wrapped in red cellophane (Tube 6) would have a faster rate of photosynthesis, than the chloroplast kept in the dark (Tube 2), the boiled chloroplast suspension (Tube 4), the addition of DCMU (Tube 5) and the tube wrapped in green cellophane (Tube 7).