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?
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.
Catalysts operate by decreasing the value of the activation energy for the reaction.  The iodide ions lower the activation energy, making it easier for the reactants to convert to the products and vice versa, hence speeding up the reaction. We use an adaptation of the Arrhenius equation ln k’ = -Ea/RT + ln A . where k’ is the rate constant, Ea is the activation energy, R is the universal gas constant and T is temperature.  to determine the Activation Energy.
As the liquid is more viscous, the ball weight would be experiencing more resistance in its motion and would thus have a lower average velocity. 1.4 Variables: 1.5.1 Independent variable: The temperature of cooking oil temperature (15 C, 30 C, 45 C, 60 C, 75 C) 1.5.2 Dependent variable: The average velocity of the steel ball weight (5g) 1.5.3 Controlled variables: These are the variables I need to control: | This is how I will control them: | 1. Volume of cooking oil | Use the same 50cm^3 pipette to measure the 300cm^3 of coking oil for each trial. | 2. Temperature of cooking oil | Use a heated or iced water bath to heat or cool the cooking oil to an equilibrated temperature | 1.5.4 Uncontrolled variables These are the variables that are uncontrolled: | This is how the uncontrolled variables affect the results: | 1.
2: First you measure the mass of the copper tacks and also try to get the mass of the water in the thermos as close to 0.1 kg since 1 dl of H20 = 0.1kg H20. 3: Using the test tube holder, sink the test tube with the copper in it into the 4: The electric kettle is now supposed to make the water boil and raise the temperature of the copper as close to 100ºC (T1cu) but it is not very likely that you will get exact 100ºC due to heat loss. This step will almost certainly take a couple of minutes. 4: Measure the temperature of the water in the thermos (T1w) and then add the tacks to the water in the thermos. 5: Now measure the temperature of the water (T2cu and T2w will have the same temperature).
Acid rain affects the life in the water as well as the life on land. By figuring out how the amount of pH can affect the growth of beans, we can briefly observe what helps the environment and what hurts it, by the level of pH. In this experiment the beans are the independent variable, and the pH the constant. If the pH is lower, then the beans will grow more slowly than the beans being tested in a high pH. This also means, If the pH being tested is 6, then the beans will grow more quickly then if you placed them
I thought distillation would remove the salt. The benzoic acid I wasn’t really sure about. B. If each step isn’t done correctly before moving on to the next step the percent for error rises. C. The sand recovery percentage being higher than the original sand percentage could take place if all the iron was not removed from the mixture.
GEOENGINEERING-CARBON SEQUESTRATION How are we trying to decrease the carbon levels, and how do our carbon removal projects have an effect on the environment? Every time mankind burn fossil fuels such as gas, coals, and oil carbon dioxide is distributed into the earth’s atmosphere, this is called carbon emission. However as the fuels burn, the carbon emitted is being trapped in the earth’s atmosphere. Due to extra carbon in the air, there is an increase in the earth’s temperature that causes changes in the climate and results in greenhouse gasses. We cannot dramatically change our lifestyle to remove all the CO2 out of the air, so scientists are working on two projects.
Some scientist’s had this view in the past, which has now been refuted and replaced by more current thinking about how elements are arranged. I agree with Evie that the mass of magnesium goes up and my view is formed from the evidence presented by the results of the experiment carries out, the particle and brick models and findings of various scientists in this field. The mass of magnesium increases when it is burnt. The Magnesium reacts with the oxygen in the air to form the compound - magnesium oxide. The powder that remains will have lost some mass as smoke, but this resultant mass is still more than the mass of the metal that was burnt.
Deforestation reduces the amount of carbon dioxide being used in photosynthesis and the use of land for agriculture releases carbon dioxide into the environment. Both of which adds carbon to the atmosphere faster than plants can remove it. More recently, reforestation and changed agricultural practices have improved this somewhat. (Pearson Education, 2011) Nitrogen is needed by all organisms to make proteins. Almost 78% of the atmosphere is nitrogen thus meaning that the main reservoir for the nitrogen cycle is the air.