Chemistry Stoichiometry

Analysis of Silver in an Alloy
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The purpose of this lab was to calculate the percent of silver in an alloy using gravimetric analysis. Through the procedure mentioned in this report, the percent of silver in an alloy of a U.S. Mint dime made before 1965 was 90.2% � 0.05%. Introduction: The alloy used for this experiment was a U.S. Mint ten-cent dime alloyed as silver and copper if made before the year 1965, after which mints began using copper and nickel instead. First, the dime…...
Investigating Stoichiometry
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Quantitative Data: The table shows the mass of reactants potassium iodide and lead(II) nitrate, and the mass of the precipitate from the reaction between KI(aq) and Pb(NO3)2(aq). Mass of precipitate from reaction between KI(aq) and Pb(NO3)2(aq) Mass of potassium iodide (�0.001g) 1.701 Mass of lead(II) nitrate (�0.001g) 1.280 Mass of filter paper (�0.001g) 0.798 Mass of precipitate + filter paper (�0.001g) 2.525 Mass of precipitate (�0.001g) 1.727 Qualitative Data: 1) After pouring the KI(aq) and Pb(NO3)2(aq) solution together into the…...
The Formation of Diels-Alder Reactions
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The Diels-Alder reactions consist of a reversible dienophile and diene all in a one-step reaction initiated by head. These reactions form a six membered ring with at least one pi bond and two sigma bonds, making the reaction exothermic. The goal of the first part of these experiments is to make products that have a greater aromatic stabilization. In 1928, Otto Paul Hermann Diels and Kurt Alder first documented this type of reaction, hence the name Diels-Alder reactions. Their reaction…...
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Determine the Reaction Stoichiometry and the Valency of Magnesium
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Objective: To study the quantitative relationship between the amount of the reactants and products of a reaction. A known starting mass of magnesium and the measured collection of hydrogen gas will be used to determine the reaction stoichiometry and the valency of magnesium. Introduction: Stoichiometry is the study of the quantitative relationship between amounts of reactants and products of a reaction. Stoichiometry can be used to calculate the amounts of products with given the reactants and percent yield. In this…...
Gravimetric Analysis Report
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Synopsis The objective is to determine the amount of Sulphate in anhydrous Barium Sulphate precipitate by gravimetric method. Gravimetric method is by the quantitative determination of the mass of anhydrous Barium Sulphate precipitate. Barium sulphate precipitate is form when Barium Chloride is added excessively to a hot given Sulphate solution slightly acidified with concentrated Hydrochloride acid. The white precipitate of hydrate Barium Sulphate formed is than digest, filtered out, washed and dried than cool down in a desiccator. Anhydrous Barium…...
Stoichiometry of a Precipitation Reaction: Lab Abstract
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Abstract: The purpose of the lab, Stoichiometry of a Precipitation Reaction, is to be able to calculate the amount of a second reactant we need to react with the reactant one. You must calculate the amount of the second reactant using stoichiometry to figure out what amount is needed. After the amount is calculated, you then can add it to the first reactant and it will give you a full reaction. To figure out what you need you have to…...
Stoichiometry Precipitation
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The calculations completed for this experiment include determining the amount of Na2CO3 needed to do a full reaction. This was calculated through stoichiometry calculations: Molar mass was first calculated for CaCl2*2H2O Ca = 40.078g Cl2 = 35.453g*2 = 70.906g 2H2 = 1.00794g*4 = 4.03176g 2O = 15.9994g*2 = 31.9988g 40.078g + 70.906g + 4.03176g + 31.9988g = 147.01456g or 147.0 g CaCl2 1g CaCl2 * 2H2O x (1 mol CaCl2 *2H2O/147g CaCl2 *2H2O) = 0.0068 mol of CaCl2*2H2O Molar mass…...
?Determining the Stoichiometry
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On graph paper, plot the milliliters of reactant #1 versus volume of precipitate for each reaction. For the copper chloride graph, draw the two best-fit straight lines through the data points and determine their point of intersection. Cu:PO4 stoichiometric ratio = 3:2 Balanced Equation = 3CuCl2 + 2Na3PO4 Cu3(PO4)2 + 6NaCl For the iron nitrate graph, draw the best-fit line through the ascending data, and a smooth curve through the descending data. Determine their intersection point. From the point of…...
Limiting Reactant Lab
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Introduction During this lab, we found the excess reactant and limiting reactant between Aluminum and Copper (ll) Chloride. Using stoichiometry, we were able to make predictions. Through the reaction 2Al + 2CuCl₂ → 3Cu + 2AlCl₃ we carried out this experiment and determined that the limiting reactant was CuCl₂ and that the aluminum was in excess. We also determined the percentage yield of copper. Purpose: The purpose of this experiment was to determine the limiting reactant and percentage yield of…...
Stoichiometry of a Precipitation Reaction
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Abstract: In this experiment Stoichiometry of a Precipitation Reaction, the main objectives were to use stoichiometry to calculate the theoretical yield of CaCO3 that precipitates from the reaction between Calcium chloride, Dihydrate and Sodium carbonate, and then compare that value to the actual yield. In order to do this accurately, we must be able to measure the products and reactants with accuracy. The last objective of this experiment is to calculate the percent yield of the product produced. When 1.0…...
Grignard Synthesis
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Objective: The goal of this lab is to synthesize a Grignard reagent from bromobenzene and magnesium metal in diethyl ether. This same Grignard reagent would then be used to prepare a tertiary alcohol and then purify and characterize the product. Procedure: Refer to the microscale lab in pages 124-130 (15.1 and 15.2) in Modern Projects and Experiments in Organic Chemistry: Miniscale and William Microscale. Observations: Mixture of magnesium with bromobenzene turned into a yellow coloration after the bubbling. After much…...
Preparation of Cyclohexene From Cyclohexanol
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Abstract: A 42.89% yield cyclohexene was successfully synthesized from 10.0 mL cyclohexanol by unimolecular elimination (E1) through the dehydration of cyclohexanol and confirmed via a bromine test and the IR spectra. Introduction: Alkenes are hydrocarbons that have carbon–carbon double bonds and are one of the many functional groups in organic molecules. Alkenes are sp2 hybridized and are unsaturated because two of their hydrogen’s are missing from the saturated alkane formula (CnH2n+2). Typically alkenes are synthesized by elimination reactions, however, organic…...
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