Therefore, if zinc granules provide a larger volume with a constant mass, the density would be much smaller. 2a. What does the slope of the line signify in the graph that you plotted? The slope in the equation we obtained signifies the density of zinc. 2b.Comment on your y-intercept.
A small round piece of zinc sinks when thrown in a pond and a substance like mineral oil floats on water (remember the test for iodine). But if that is true then why does a zinc-plated ship float on water? A zinc-plated ship floats on water because of its shape. If the body of the ship (hull) is designed perfectly then it can compensates for its own mass by displacing a sufficient amount of the mass of water. It has to displace enough mass of water before it sinks.
Hareem Qureshi Group 6 Presentation Lab 6: Grand Central Equation Focus Questions: * Zinc Iodide can be gained through more than one method. We experienced making Zinc Iodide through zinc granules and iodine chips first and then we used Barium Iodide and Zinc Sulfate to make the zinc iodide. Chemists should prepare Zinc Iodide from its Elements rather than using double replacement reaction between Barium Iodide and Zinc Sulfate. In comparison to the grand central equation lab, the castle of quantification lab proves several benefits of using just Zinc and Iodine in formation of Zinc Iodide. Zn + I2 ⟶ ZnI2 | BaI2·2H2O +ZnSO4·7H2O⟶ZnI2+BaSO4+9H2O | Zinc used: (2g x $0.0625)=$0.125Iodine used:(3g x $0.1003)=$0.301Material cost for 3.1g of ZnI2 =$0.498Material cost for 10g of ZnI2 = $1.6 | 0.48g of Zinc Sulfate heptahydrate used= $0.01940.62g of Barium Iodide dehydrate used= $0.549Material cost for 0.48g of Zinc Iodide= $0.5684Material cost for 10g of ZnI2 = $11.84 | % Yield from Zn and I2 reaction: 98.6%% Error: 1.39% | % Yield from BaI2·2H2O and ZnSO4·7H2O reaction:103.6%% Error: 3.6% | The data above shows that Zinc Iodide formation through elements is much more efficient than using compounds.
The water can be removed via heat and we are left with a white solid, Zinc Iodide sold. 2. The physical and chemical properties for some were the same and for some it was different. The color of the Zinc Iodide is different (white, while Iodine is gray and Zinc is silvery), while ZnI2 is as odorless as Zn is (I2 has a pungent odor). ZnI2 does not react chemically with mineral oil the same way I2 does (no purple color
Zinc ion and Iodine-iodide-triodide ion in water: It was a liquid solution in a bottle, it was very dark orange-brown color. Solid Zinc Iodide: A very white powdery substance that had several clumps within it. It was also very dry in nature. Mass Table Substance Amount of Mass Measured for Actual Mass Granular Zinc 2.0 grams 1.9 grams Iodine Crystals 2.0 grams 2.1 grams Observation of Reaction Shown below and Included within the lab notes on pages 12 and on page 14. Placing Acetic Acid in Zinc and Iodine test tube After placing the Acetic Acid in a normally unreactive test tube containing Zinc and Iodine, the solution changed to a more orange and then to a more red-brown color.
Chemistry Lab – Precipitate Patterns Purpose: To identify which anion will be used to form a precipitate with the most metal cations. Procedure: All materials were obtained A chart was made to compare anions and cations Drops of sodium carbonate solution were placed in each section of the wet plate Dilute solutions of calcium carbonate were dropped into the sodium carbonate and observations were recorded Step 4 was repeated for all other reacting solutions and observations were recorded Chemicals were placed into a waste beaker and disposed of Lab station was cleaned Observation List: Na2CO3 + Ca(NO3)2 CaCO3 + NaNO3 -Formation of a precipitate Na2CO3 + Cu(NO3)2 CuCO3 + NaNO3 -Formation of a precipitate Na2CO3 + Fe(NO3)2 FeCO3 + NaNO3 -Formation of a precipitate Na2CO3 + Mg(NO3)2 MgCO3 + NaNO3 -Formation of a precipitate Na2CO3 + Zn(NO3)2 ZnCO3 + NaNO3 -Formation of a precipitate Na2CO3 + NaSO4 Na2CO3 + Na2SO4 -Formation of a precipitate Na2SO4 +Cu(NO3)2 CuSO4 + NaNO3 -Formation of a precipitate Na2SO4 + Ca(NO3)2 CaSO4 + NaNO3 -Formation of a precipitate Analyse and Evaluate: The investigation could have been improved of beakers were used instead of wet plates. This way, it would have been easier to see the reactions taking place. The anion that could be used to precipitate the most metals cations was carbonate. Carbonate could be used to remove silver ions.
6. Zinc Sheet: a rectangular, thin, sheet like metal, gray/silver. 6 5 4 3 2 1 * Solubility of solid iodine; 1. Solid iodine in 1 mL of water is slightly soluble, because the solution turns into a light brown/yellow color. However majority of the solid Iodine was left at the bottom of the test tube; which leads to the conclusion that it’s not reactive on water.
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.
Task 3 (D4) Choose one primary and one secondary cell and evaluate their use for portable applications. Primary – (silver oxide cells) Zinc-silver oxide cells effectively use the high electrode potential of silver to produce a high energy density that is combined with a flat discharge curve. This is done as silver oxide forms a positive anode for the cell which could also be mixed with little amounts of manganese dioxide. The metallic zinc in the battery powers the negative electrode which is formed into a gel like substance with the electrolyte usually sodium hydroxide or potassium hydroxide. A separator membrane will then be infiltrated between the negative electrode gel and positive electrode preventing them from being mixed together which would make the battery useless if not in place.
| | | | | Selected Answer: | dehydration reactions | | | | | * Question 4 1 out of 1 points | | | Which of the following is true for all exergonic reactions? | | | | | Selected Answer: | The reaction proceeds with a net release of free energy. | | | | | * Question 5 1 out of 1 points | | | A chemical reaction that has a positive G is correctly described as | | | | | Selected Answer: | endergonic. | | | | | * Question 6 1 out of 1 points | | | Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as a(n) | | | | | Selected Answer: | cofactor necessary for enzyme activity.