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.
Not only will we determine which one is the most resourceful for creating these packs, but we will also consider how much it will cost to actually produce them for the Dystan Medical Supply Company. In order to do this, we must find a way to determine the mass of each individual necessary in the production of a 100-mL cold pack that can attain a temperature of 0C and a 100-mL hot pack that can reach a temperature of 65C. To carry out our experiment, we will construct a calorimeter and record numerous thermograms using the MeasureNet station. In return, we will be able to tell from our
If the compound is new then the melting point is recorded in order to allow future characterization by others. And finally the range of the melting point is indicative of the purity of the compound; a pure solid will melt reproducibly over a narrow range of temperatures, less than 1 °C. A pure solid will melt reproducibly over a narrow range of temperatures, less than 1 °C and an impure compound will melt over a wide range of temperatures. Recrystallization of the compound will purify it and the melting point range will decrease. In addition, the entire range will be displaced upward.
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).
On the surface of the enzyme is an active site that temporarily binds the reactants or substrates forming an enzyme-substrate complex. The catalytic action of the enzyme then converts the substrate to a product or products. This conversion can take the form of a synthesis (building more complex molecules), a decomposition (splitting of the substrate), an oxidation/reduction (addition or removal of electrons), or an isomerization (rearrangement of atoms within a molecule). When the product or products are released, the enzyme emerges unchanged and available to convert more substrate into more products. Since enzymes can be used again and again, they are effective even at low concentrations.
5.51: Which Reagent is limiting and How Much Precipitate is formed? SCH-3UI-03 David Yu Mrs. Hatton Due Date: May 5, 2012 Cut-Off Date: May 12, 2012 Purpose: To experience and use what you have learned in class about gravimetric stoichiometry by predicting and determining the mass of precipitate of two reactants and then comparing what you experience and what you calculated. Background: Avogadro’s constant is 6.02 x 1023 to find the number of entities. A mole is a useable amount of chemicals that is practical to use. The molar mass of a compound or atom is the mass of 1 mole of anything; this is relative to the atomic mass from the periodic table.
Physical properties include: colour, odor, density, melting point, texture, boiling point, solubility, freezing point, conductivity and malleable amongst others. * * Chemical properties can only be observed once a substance undergoes a chemical reaction/change. Essentially describing how a substance will react with other substances: a change to the chemical formula. Chemical properties include: flammability, toxicity, reactivity with water and heat of combustion. * * The more identifiable properties, the greater understanding of the nature of a substance and its behaviour under various conditions.
Copper Sulphate Preparation Introduction/Background Information The importance of knowing the yield when you’re working in industries is so you can purify the copper and reduce its cost and energy used. Preparation- Is a Solution- Is a mixture of solid (s) dissolved in liquid Filtration- Is the physical separation technique for separating solids from liquids. Crystallisation- Is when regular shaped practical of solid (crystal) are formed by heating or evaporating a solution until it becomes fully “saturated” with solid. It is different to the amorphous (irregular shaped) appearance of the solid particles in of precipitatecompounds/sample correct color. Aim The aim of the experiement was to prepare copper sulphate crystal using copper oxde and sulphuric acid.