Undoped and Ce doped ZnO thin films were prepared by the sol-gel process. Zinc acetate dehydrate was dissolved in a mixture of absolute ethanol and monoethanolamine (MEA) yielding to a precursor concentration of 0.4 M .The MEA to zinc acetate molar ratio was set to 1. For doped films‚ cerium nitrate was added to the mixture with an atomic percentage fixed at 0.1‚ 0.3‚ 0.5‚ 0.7‚ and 0.9 at.% Ce‚ respectively. The resulting sols were magnetically stirred at 60°C for 1 hour and then aged at room temperature
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GROUP A MODEL ANSWER Brafman et al.‚ Five New Zinc Sulphide Polytypes: 10L (8 2); 14L (5 4 2 3); 24 L (5 3)3; 26L (17 4 2 3) and 28L (9 5 5 0). Acta Cryst. 22‚ 347 - 352 (1967). DO NOT PLAGIARISE THIS MODEL ANSWER Paragraph 1 ZnS exists in two polymorphs‚ namely sphalerite and wurzite. Analysis of its symmetry and crystal structure using ATOMS will be used to deduce its possible polytypic stacking sequences as well as the orientation relationship between these two structures. Sphalerite is
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decrease in oxidation state. If zinc completely reacts with HCL‚ then the theoretical yield of copper should be equivalent to the actual yield. Purpose: In this lab‚ we will determine the percent composition of a modern (post-1982) penny by using a strong acid to react and dissolve the zinc core‚ leaving only the copper coating. Once only copper remains‚ we will compare its mass to the entire mass of the penny to determine how much of a penny is copper and how much is zinc. Titration Experiment Day
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moles in 2.65g of zinc. 2. Calculate the number of moles of hydrochloric acid in 37.5mL of a 3.00M HCl solution. 3. Calculate how many moles of HCl are required to react with 0.244 moles of zinc. Procedure: 1. Put on safety equipment. 2. Label small glass vial so your group can identify it later. 3. Determine the mass of the clean dry vial and record your mass to 2 decimal places on your lab sheet. 4. Zero the balance. 5. Add 3-4 grams of zinc to the vial and
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Experiment 9 Empirical Formula of Zinc Iodide Objectives Upon completion of this experiment‚ students should have learned: 1. The law of conservation of mass. 2. How to calculate an empirical formula. 3. The concept of limiting reagents. Introduction Synthesis and the determination of empirical formulas are two extremely important parts of chemistry. In this experiment‚ you will synthesize zinc iodide and determine its empirical formula. The molecular formula gives the actual
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Zinc is one of the longest-studied nutrients that correlates with statistically significantly less acne. Some months ago‚ I discovered that around 200mg/day of zinc picolinate could‚ under some circumstances‚ make me dramatically acne-free for the first time ever. That led to a very long course of study‚ research and experiments. For a megadose of zinc to affect acne dramatically‚ a good bet was that zinc is a cofactor in a reaction that affects acne. If you have a chemical reaction in the body
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battery ever created was way back in 1800. Alessandro Volta was the inventor of the first ever battery‚ which consisted of layers of zinc‚ blotting paper soaked in salt water‚ and silver. In the 1800 ’s‚ the Daniel cell was developed‚ which is also known as the wet ’ cell‚ as it used liquids for the electrolytes. It consists of copper and zinc plates‚ and copper and zinc sulphates. Although the Daniel cell worked‚ it was only suitable for stationary items‚ such as door bells as it was a wet cell.
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leading to a collection of developmental and physiological conditions commonly grouped as “lead poisoning.” In brief‚ lead acts on small biological systems that affect a major system‚ an example of which are zinc-finger proteins. The zinc-finger‚ a common protein motif‚ relies on the coordination of Zinc (Zn) ions for the protein’s shape and stability; therefore‚ any alterations can affect its shape and‚ inherently‚ its function. In an article by Jacqueline Michelle Ordemann and Rachel Narehood Austin‚
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Abstract: One is to determine the gap energy of cadmium sulfide semiconductor thin film using the equation: Eg = h.c/ is the signal of the long wavelength limit of the absorption peaks (measured in the lab). The reaction between cadmium sulfide and NH3‚ in the presents of thiourea yield a of 579(nm). The % error of the reaction is 1.24%. Introduction: There are 3 types of metals for electricity conducting: metallic conductor‚ semiconductor‚ and superconductor. Metallic conductors
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Constant Density: Displacement of Zinc and Tin Introduction: Density is the concentration of molecules within an object on relation to its size. The formula for measuring density is mass/volume. In the experiment preformed for this lab report‚ calculating the density of a regular object (a wooden block) and two other irregular objects (zinc and tin) were found by a process known as water displacement. The purpose of this experiment was to prove that the density of an object remains the same
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