0.00512 * 500 = 2.56 c. 0.00806 * 319.9= 2.56 d. 0.00806 * 319.9 = 2.56 500 mL =0.5 L e. 0.0161 * 500 / 2 =2.56 4. Exercise 4: a. 0.250M; 250 mL 0.25 L (0.25) (0.25) = 0.0625 moles ZnI2 b. Prepare the solution by dissolving 19.95 grams of Zinc Iodide with 250 mL of water. c. Prepare the solution by dissolving 38.90 grams of ZnI2 with 500 mL of water.
Determining the Percent of Copper and Zinc in Pennies Objective: * Find a way to measure the percent of density of the zinc and copper in pennies * Use best-fit straight line to examine linear relationships, and use it to create a predictive model to determine the percents * Learn to record lab data and observations, and practice with safe procedures in the lab. Background: As we know of today pennies are not made with just copper, they are made with many different metals and have a copper coating. To find the percent of copper you need to find the densities of the materials that make up a penny and then find the mass of just the copper and you can find a percent. Experiment Procedure: Determine the density of the following percentages of Zinc and Copper mixtures. Then compare the precision and accuracy of the data to the literature values for pre and post 1892 pennies when using various numbers of coins.
The chart of reactivity tells chemists the comparable reactivity of elements. An element higher on the list is more reactive than the elements below it and can replace all elements below it. Overall, knowing the types of reactions and reactivity of elements both help predict products of a reaction. It is only with an understanding of these principles can one execute the Copper Cycle Experiment, for the experiment requires a good understanding of how mass can be altered via these reactions, but never destroyed. The experiment was performed to evaluate the skills of an individual to perform some lab skills like filtration and decantation and use these skills to understand the concept of percent yield.
Theoretically speaking, if we use one granule of zinc and one granule of iodine opposed to one granule of Barium Iodide and one granule of Zinc Sulfate, the cost would be $.2123 in total for the elemental reaction and $.9265 for the double replacement reaction. In terms of safety, it is safe to say that the safer thing would be centrifuging since we are
Pre Lab Objective: The purpose of this lab is to obtain the mass and volume of two different metal samples, to graph data, to obtain the slope of graphed data and to display a best fit curve of experimental data in order to graphically determine the density of each metal Background: Understanding the relationship that exists between a substance’s mass and its volume. This relationship is expressed by the physical property called density. (D = M/V). In order to determine the volume of solids, a technique called water displacement is used. A fixed amount of water is added to a graduated cylinder and the volume of water is recorded.
Single Replacement Reaction Laboratory Modified from Glencoe Chemistry - Matter and Change, Glencoe McGraw-Hill, 2002 Objectives Observe a single replacement reaction Measure the masses of iron and copper Determine the mole ratios and the limiting reactant Chemicals Iron filings (Fe) – 20 mesh Copper(II) sulfate pentahydrate, (CuSO4·5H2O) Distilled water Materials Stir rod 100-mL beaker 250-mL beaker 25-mL graduated cylinder Weigh paper Balance Hot plate Beaker tongs Wire mesh insulated pad screen Distilled water wash bottles |Lab Data - Reaction of Copper(II) Sulfate and Iron | | Mass of empty 100-mL beaker |(g) | | | Mass of 100-mL beaker
The purpose of the lab was to determine which reactant was the limiting reactant, and to see how much of the other reactant was used. The true molarity of a compound can be defined as the amount of moles per liter of that substance. The equation of this single displacement chemical reaction done during this lab is 2Al(s) + 3CuCl(aq) → 3Cu (s) + 2AlCl2 (aq). In the reaction, the solid Aluminum replaces the Copper in Copper (II) Chloride to produce solid copper, and Aluminum Chloride. In order to find which reactant is the limiting reactant, an equation based on the molarity of the Copper (II) Chloride may be used, or the products of the reaction may be observed.
The purpose of the experiment was to do a solution, which molarity is 0.20 mol/l, from water and an ionic compound. Our ionic compound was zinc sulfate (ZnSO4). Our task was to make one hundred milliliters (100 ml) of the solution. Materials To execute the experiment we used the following equipment: - a beaker - a volumetric flask - a plastic spoon - a scale - a pipette - a funnel - a cork cap We also used solid zinc sulfate (ZnSO4), and distilled and deionized water to make the solution. Calculations To figure out the amount of zinc sulfate that we had to add to the water, so that the molarity of the solution would be 0.20 g/mol, we did the following steps: First we calculated the amount of the zinc sulfate to add in moles.
Adam Workman Lab, Week #1 Balance Lab Introduction The purpose of the Balance Lab experiment was to become familiar with the ChemLab software and to become familiar with different mass measurement methods. During the experiment, three different mass measurement methods were used to determine the mass of copper slugs as well as the mass of two different unknown weights: the direct weight method, the weighing by difference method, and the average mass method using both a centigram balance and an electronic balance. Using the centigram balance, the weight of a single copper slug, in grams, is determined using both the direct weight and weight by difference methods. Likewise, using the electronic balance, the same copper slug is measured by direct weight and weighing by difference methods. Using the same electronic balance, the average mass of five copper slugs, in grams, will be determined.
Creating a Precipitate Lab Julia Wu Purpose: The purpose of this lab was to use Calcium Chloride and Magnesium Sulfate to produce 2.00 grams of precipitate. Materials: calcium chloride, magnesium sulfate, two beakers, two flasks, funnel, and filter paper. Procedure: Write the balanced equation for Calcium Chloride and Magnesium Sulfate. Calculate how much of each reactant is needed to produce 2.00 grams of precipitate. Once you have calculated the amount of each reactant, proceed to the lab table and retrieve the following equipment: two graduated cylinders, two beakers, two flasks, funnel, and filter paper.