Conclusion 10 Grams of Potassium chlorate when decomposed produces 3.915576 grams oxygen gas and 6.083363 grams potassium chloride Atomic Weight of Magnesium Introduction In this lab we will determine the atomic weight of magnesium by measuring the amount of hydrogen gas evolved when hydrochloric acid reacts with magnesium. The reaction is as follows: Mg + 2HCl -> H2 + Mg2+ (aq) + 2Cl- (aq) There is a one to one relationship between the number of moles of hydrogen gas evolved and the
We used .112 moles of bromobenzene, and .0103mole of magnesium moles of Methyl benzoate was the limiting reagent in the experiment. In calculating the theoretical yields. We used the limiting reagent multiplied by the molecular weight of the product. The initiation of the Grignard reaction began after about ten minutes of gentle heating was applied to thereaction flask containing the crushed magnesium turnings and first portion of the bromobenzene/anhydrous diethyl ether solution. This initiation was evident by cloudiness and graying of solution as well as the evolution of bubbles off the surface of the metal.
palladium on carbon 13 of 22 4/16/12 9:15 PM StudyBlue Flashcard Printing of Lab Final 2211L UGA http://www.studyblue.com/servlet/printFlashcardDeck?deckId=... Which alkyl halide would react fastest in a nucleophilic substitution using silver nitrate in ethanol? 3-bromo3-methylpentane bc its sn1 Which alkyl halide would react fastest in a nucleophilic substitution using sodium iodide in acetone? 1-bromopentane bc its sn2 What is the name of the chemical reagent used as the source of Br2 in the preparation of diphenylacetylene? pyridinium hydrobromide perbromide type of stationary phase column length column temperature rate flow of the carrier gas List the 4 general factors that affect the separation obtained on a gas chromatograph What specific technique is used to collect/isolate your purified unknown compound at the end of the recrystallization experiment?
Empirical Formula of a Compound Experiment 5 Anderson North John Corbin General Chemistry I Lab Wednesday Night 10/21/09 1) Introduction a) The purpose of this experiment involving empirical formulas of a compound is to determine the empirical formula of magnesium oxide and the percent yield in this quantitative experiment1. Even though magnesium, an alkaline earth metal, is the eighth richest metal in the universe and seventh most common element in the crust of the earth, it is not found freely in nature4. Magnesium, when combined with oxygen at elevated temperatures, burns into a bright white flame to produce magnesium oxide4. Also referred to as magnesia, magnesium oxide is the second largest compound found in
The half reactions for this system are: Oxidation of 〖Fe〗^(2+): 〖Fe〗^(2+)→ 〖Fe〗^(3+)+1e^- Reduction of 〖MnO〗_4^-: 〖MnO〗_4^-+8H_3 O^++5e^-→ 〖Mn〗^(2+)+12H_2 O Which produces the following overall equation: 〖MnO〗_4^-+8H_3 O^++5〖Fe〗^(2+)→5〖Fe〗^(3+)+〖Mn〗^(2+)+12H_2 O Equilibrium is initially obtained at a very slow rate, therefore the titration is carried out in the presence of excess sulphuric acid (H_2 〖SO〗_4) at a high temperature; in order to drastically increase the rate at which equilibrium is attained. Potassium permanganate acts as its own satisfactory indicator since the reagent 〖MnO〗_4^- anion appears to be an intense purple colour while the product 〖Mn〗^(2+) cation has a colourless appearance. However, the end point must be read quickly as the permanganate end point gradually fades due to the 〖MnO〗_4^- reacting with the 〖Mn〗^(2+) that was formed during the titration. When performing the titration, one must be cautious as side reactions can occur and these side reactions must be prevented using appropriate chemical measures. If an insufficient amount of acid was
In well A2: Place 10 drops of Magnesium Sulfate, MgSO4 c. In well A3: Place 10 drops of Zinc Nitrate, Zn(NO3)2 d. In well A4: Place 10 drops of Iron (III) Chloride, FeCl3 e. In well A5: Place 10 drops of Copper (II) Sulfate, CuSO4 3. Take the metal solids from your LabPaq; there should be one piece each of magnesium, zinc, and iron plus two pieces of lead. NOTE: Magnesium and lead oxidize very easily and an almost invisible oxidation layer may coat the metal. To insure good reactions you should scrape the surface of those metals with a pocketknife or remove the oxidation layer by rubbing the metal pieces with steel wool or something similar. Evidence that a reaction is taking place is the formation of bubbles or a coating on the metal immersed into the solution.
We resulted that lead, silver, and copper are the strongest oxidizing agents, and that magnesium and zinc are the weak oxidizing agents. The strong oxidizing agent oxidized the weak oxidizing agent and in turn the strong oxidizing agent got reduced while oxidizing the weak agent. When a reaction occurred, the solid metal reduced the ion, and in turn made it the more reactive metal. In part two we used a solvent extraction technique to derive an activity series for the halogens. With the use of this technique we placed chlorine, bromine, and iodine into solutions containing chloride, bromide, and iodide.
Properties of Some Representative Elements Trey Lesatz The objective of this lab was to observe the properties and reactions between several representative elements. Data Reaction With Water | | Metal | Evidence of Reaction | Relative Vigor | Indicator Color | | Li | Fizzling for 2:03 | Low | Slightly Purple | | Na | Fizzling for 0:48 | Medium | Light Purple | | K | Fizzling for 0:14 | High | Purple | | Mg | No reaction | None | Clear | | Ca | Fizzling for 0:43 | Low | Light Purple | | | | | | | Reaction of Magnesium and HCl | | | Metal | Evidence | Vigor | pH | | Mg | Fizzle | Low | 12 | | | | | | | Flame Test | | | | Metal | Color Observed | | | | LiCl | Magenta | | | | Na
Why are some organisms unable to grow in potassium cyanide (KCN) broth?if it is sensitive to cyanide, it will be unable to grow in KCN broth * * The ducitol fermentation test is positive when the media changes to a yellow color. Why does this happen? What is added to this media to allow you to see the color change? It changes because it is a source of carbon * Why do the lysine decarboxylase and arginine dihydrolase tests require 48 hours of incubation time? It takes 48 hours because it needs more time to incubate and grow Using information from your book and the Internet, answer the following questions.
August 23, 2009 Lab Partner-Joey Stabel The Analysis of Alum K.Schuyler Elvir Malikic Purpose Determining and understanding the characteristics of Aluminum Pre-Lab questions 1) When finding a melting point, why is it necessary to raise the temperature very slowly when approaching the melting temperature? When raising the temperature very slowly it gives the thermometer time to display the accurate temperature of the substance giving you a more accurate reading. Another reason would be the visual of things changing in a slower giving you time to examine what’s happening. 2) Washing soda is a hydrated compound whose