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Recommended: Reaction kinetics lab
Cadet Eric Wiggins Date: 18 September 2014 Course Name: Chem 100 Instructor: Captain Zuniga Section: M3A Identification of a Copper Mineral Intro Minerals are elements or compounds that are created in the Earth by geological processes. The method of isolating metals in a compound mineral is normally conducted through two processes.
The observed emission data for the different elements did not look how they were supposed to. However the “peaks” for Hydrogen were found to be 534.52 and 631.24, 534.70 and 569.11 for Helium and 529.73 and 630.71 for Mercury. The Rydberg’s Constant found to 1.1x107 8.5x104 while the known constant is 10967758.34m-1. The percent error of 0.29% and the accuracy of this reading is 99.7. The slope and intercept of the linear regression line is -0.01 3.3x10-5 and 0.02x10-1 1.9x10-6 respectfully.
The lab started off by measuring critical materials for the lab: the mass of an an empty 100 mL beaker, mass of beaker and copper chloride together(52.30 g), and the mass of three iron nails(2.73 g). The goal of this experiment is to determine the number of moles of copper and iron that would be produced in the reaction of iron and copper(II) chloride, the ratio of moles of iron to moles of copper, and the percent yield of copper produced. 2.00 grams of copper(II) chloride was added in the beaker to mix with 15 mL of distilled water. Then, three dry nails are placed in the copper(II) chloride solution for approximately 25 minutes. The three nails have to be scraped clean by sandpaper to make the surface of the nail shiny; if the nails are not clean, then some unknown substances might accidentally mix into the reaction and cause variations of the result.
How Mass affects Acceleration down an Incline Sabeena Jagdeo, Brianna O'Donnell, Alec Wigdahl Problem Statement: In this lab some friends are wondering if a roller coaster's acceleration will decrease with less mass in the roller coaster. The purpose is to test whether the mass of the roller coaster impacts its acceleration. Prediction: The roller coasters acceleration will stay constant whether the mass of the roller coaster changes our not. This is true because acceleration is represented by velocity divided by time in equation one.
Determination of the Heat Exchanged in Chemical Reactions Introduction: Calorimetry is the science of determining heat and energy exchange in various situations and reactions. It is used for many things everyday including solid and liquid fuel testing, waste disposal, and explosive testing. In our lab, we will are applying calorimetry to determine the change in enthalpy of a weak acid-strong base reaction. My beginning question was: How can we apply Hess’ law and calorimetry to chemical equations to determine the heat exchanged in a reaction?
If no, t my results could possibly be an out lier if we were to graph and look at the class data as a whole. One factor that could effect results would be the environment. Meaning the other people (students) around you during your trials. If one student was walking extremely fast in comparison to your normal pace you might start to walk faster subconsciously and be influenced by them. Another factor that could influence the results is not throwing the ball properly in condition four and just passing it to the other hand instead.
Future Experimenters might test throwing the ball at different speeds through the football passing machine. This may show something that could not be seen in the data from this experiment. In addition to receiving different data and statistics, experimenters may find outliers and anomalies that were not found in this set of data. Only testing at the one speed on the football passing machine may have hid statistical curves that could only be seen by changing the speed of the machine. By testing different speeds, it may show that normal regulation football will not actually travel the farthest.
• Use science concepts to explain the patterns, trends or relationships identified in the data. • Compare the results to another group: are the results of the other group the same or different? If there are differences, suggest why? These results occurred lower than the original ball drop because the gravitational force pulled it towards the ground which leaves the first bounce lower than the drop and every bounce it gets lower until it is at a still motion on the ground because of the gravitational force. The patterns in the data is, that if there is less mass the ball will bounce higher because the gravitational potential energy is lower which allows the balls elastic energy to be used to its maximum.
This type of energy also has to do with mass and so the tennis ball is already a leg up in the race. When held at the same height the tennis ball will have more gravitational potential energy. However, if the racquetball was held way higher than the tennis ball it may be able to at some point have a higher GPE. It would just have to be held from a higher point than the tennis ball. The weight difference is only 0.6 ounces but when it comes to GPE this can change the answer quite a bit.
ST Report In the experiment, the problem was the contaminants that were affecting the quality of the water samples. To fix this issue, three scientists had to determine the contaminants that were present in the samples. One sample was from the school sink and the second sample was from an unknown source. The scientists conducted many tests to figure out what pollutants were present in the water.
1 Ecosystem Dynamics and Trophic Energy Marc Mueseler BIO111 Biology Laboratory Abstract: The purpose of this experiment is to study different ecosystems and observe the change in the number of organisms at each trophic level as well as the energy transfer to each of these levels. It was observed that the number of organisms dropped off significantly from level to level as the energy transfer efficiency was approximately 10% at each heterotrophic level. Each ecosystem was only able to support about four levels before all of the energy in the system was essentially depleted. The number of organisms in each ecosystem was dependent upon the number of producers available to make their own energy thereby making that energy available to
For the 20g mass, there were 13 trials, and a total of 1.3s. The calculated value of the acceleration of gravity for the 20g mass was around 6m/s2, and the calculated friction was 0.07N, or 0.1N. For the 50g mass, there were 12 trials, and a total of 1.2s. The calculated value of the acceleration of gravity for the 50g mass was around 4m/s2, and the calculated value of friction was 0.3N. For the 100g mass, there were 8 trials, with a total of 0.8. The calculated value of the acceleration of gravity was also around 6m/s2, and the calculated value of the friction was 0.4N. For each of the masses, their corresponding displacement-time graphs had an exponential growth, as they were all accelerating. When their graphs were straightened, which was done by squaring the time, their trend lines were now
A Dark World Ahead of Us The further development of technology together with media has led to a society getting closer and closer to that of the world portrayed in George Orwell’s 1984. A world in which everything people do is monitored and controlled is something of a nightmare; but just how similar may our two nations be? Many would think that it would be inscrutable for a society to fall so low as to succumb to complete and utter brainwashing. 1984’s Ministry of Truth is similar to the media manipulation within the United States of America because they are both influenced by those holding power, have bias views towards those they dislike, and are able to control the opinions and information given to society.
I. Introduction This experiment uses calorimetry to measure the specific heat of a metal. Calorimetry is used to observe and measure heat flow between two substances. The heat flow is measured as it travels from a higher temperature to a lower one. Specific heat is an amount of heat required to raise the temperature of one gram of anything one degree Celsius. Specific heat is calculated using several equations using the base equation: q=mc∆T II.
Lab Report Experiment 6 Rates of Chemical Reactions By Nikhola Mirashirova Lab Partner: Dina Abetova Section 3, Saturday October 31, 2015 Introduction Rate reaction is the measure of the change in concentration of the reactants or the change in concentration of the products per unit time.1,2 Rate law for this experiment: Rate = k(I-)m(BrO3-)n(H+)p There are several factors which affect the rate of reaction: catalyst, reactant concentration, and temperature.1,2 A catalyst is a substance that changes, increases or decreases, the rate of a chemical reaction but is not being used up during the reaction.3 It provides an alternative way, so that the rate of reaction changes.4 Catalyst, which is used in this experiment, is (NH4)2MoO (0.5 M).