Dr. Jefferson Andrews Chemical Principalities - CHEM 1101 1 October 2008 Copper, the Funnest Lab Ever. Abstract: This experiment served as a test of our individual laboratory skills in carrying out several Abstract: chemical transformations involving copper. The experiment was successful in that the Abstract: percent yield was reasonable, and we were able to recover our copper sample with Abstract: maximum efficiency ( we were able to recover all of the copper with which we began ). Introduction: This experiment involved the separation and purification of our desired product ( copper ) from any unwanted side products. This was accomplished using several different methods including filtration, sedimentation, decantation, extraction, and sublimation.
Experiment 14: Iodine Clock reaction Summary of principles: In this lab we will learn to measure the rate of a chemical reaction between persulfate ion and iodide ion. The order of the action will need to be determined in the order of the persulfate ion to the iodide ion. The method we will use is the Initial rate method. The activation of the reaction will be determined from the temperature dependence rates of the reaction. The lesson of the lab is to teach us about Chemical kinetics, speeds and arrangements of molecules in a reaction during the process it goes from reactants to products.
Web. 27 Jan. 2011. <http://sprayberry.moodlehub.com/file.php/12/Chem/Labs/FormulaOfHydrateLab_woc_032.html>. Procedure; Data/Observations: The purpose of this lab is to determine the molar ratio if water to copper (II) sulfate in blue copper (II) sulfate hydrate crystalline salt. First, all the materials were received and placed together as shown in the diagram: Bunsen burner, Crucible, Crucible Tongs, Clay Triangle, and Ring Stand.
Name: 6.03: Calorimetry Data and Observations: Part I: Insert a complete data table, including appropriate significant figures and units, in the space below. Also include any observations that you made over the course of part I. (4 points) I observed that when the metal is placed inside the calorimeter, it transfers heat to the water making the water increase temperature while the metal will decrease temperature. I also noticed that the system was the metal and the surroundings is the water, this is because the water is taking in the heat from the metal making the water warm. Metal Name Mass of Metal Volume of water Initial temp.
The Effects of Temperature and Acidity on Peroxidase Activity Yohannes Eshete 14 November 2014 Peroxidase is a type of enzyme that has a large protein containing an iron ion in its active site, acting as a cofactor. Peroxidase is an appropriate enzyme for experimentation because it is easily prepared and assayed. The goal of our experiments was to find out the effects of temperature and acidity on this crucial process by taking note of its reaction rate at varying temperatures and pH levels. The results of peroxidase were observed by aggregating guaiacol which is a substance that binds to the enzyme and is oxidized when hydrogen peroxide is turned into water. A spectrophotometer was used to annotate the change in color resulting from that oxidation, which directly correlates to the amount of hydrogen peroxide converted.
The more active the metal the more basic it’s saturated hydroxide solution. The sulfate compounds of alkaline earth metals show decreasing solubilites as you go down a group. This characteristic is used as a means of separating and identifying metallic ions in a group. Carbonates are pretty insoluble. You will observe in this experiment some of the characteristics of the alkaline earth metals discussed here and will write balanced equations for all reactions.
Chose and Obtain Sulfate Solution will form aqueous compound as sulfate when combined with anything is aqueous · Is an anion 3. Chose and Obtain Nitrate Is an anion · Need another anion to test and see if order of reactivity is correct for each anion Solution will always form an aqueous compound according to Alchem Table 4. Chose and Obtain Copper Used by different lab partners whose data was observed Carrying Out The Reactions & Collecting Data How Why 5.Place 10ml of water in a test tube Done so aqueous solution may be made 6. Take magnesium nitrate and place 3 drops into test tube with water Done to have one part of the reaction 7. Repeat step 5 and 6 but replace magnesium with zinc Done so 2 metals can be tested at the same time 8.
Specific Heat By: James Ott Date: January 1, 2013 PURPOSE/INTRODUCTION The purpose of this experiment is to measure the temperature of metals, and estimate the specific heat for a metal. This experiment is also an introduction to the use of a calorimeter. This is a good way of using a known amount of metal and a known temperature change. The calculation for finding specific heat of a metal is: q=s x m x Δt MATERIALS Materials required complete the lab: * Test tube * Bunsen burner * 100 g Iron (Fe) shot * Thermometer * 250 ml beaker with 150 ml Water (H2O) in beaker at room temperature * Calorimeter with 100 ml Water (H2O) at room temperature * 100 g Aluminum (Al) shot * 100 g Copper (Cu) shot METHOD * Set up one test tube * Add 100g Iron shot and thermometer * Setup a 250 ml beaker with 150 ml room temperature water * Place filled test tube in beaker * Setup a Bunsen burner * Hover beaker over Bunsen burner until thermometer reads 100˚C * While beaker is warming, set up calorimeter with 100 ml of room temperature water (20˚C) * When metal temperature reaches 100˚C, remove from beaker and pour liquid into calorimeter, close lid and read thermometer reading * Record reading * Repeat above steps for other two metals DATA Metal | Initial Temp. (˚C) | Final Temp.
The specific molecule or closely related molecules on which an enzyme functions is known as its substrate. Shape plays such an important role in enzymatic catalysis that often even isomers of a substrate will be rejected. Once the substrate enters the active site, it may begin a process known as induced fit in which the enzyme perfectly conforms to the molecule to allow for more efficient catalysis. Changes in environment can severely impact enzyme catalysis in both negative and positive ways. Each enzyme has specific ranges at which it optimally functions; in general, increasing the temperature will help the reaction along, until the point at which the protein degrades and denatures.
Distinguish between oxidation/reduction, activation energy/catalysis, substrate/product, and hydrogen peroxide/peroxidase. Describe how temperature, pH, enzyme concentration, and substrate concentration affect the reaction rate. Explain why peroxidase is a necessary enzyme for all aerobic or oxygen-using cells. Background Information The thousands of chemical reactions that occur in a cell at any given time do not occur randomly, but are highly under the control of biological catalysts called enzymes. A catalyst is a substance that speeds up a chemical reaction without being consumed by the reaction.