100%. This was due to errors in the experiment. What was your limiting reagent? The limiting reagent was magnesium. Calculate the percentage yield of the reaction‚ using your initial mass of magnesium ribbon. Determine what the limiting reagent is. 0.10g Mg x (1 mol / 24.31g) x (2 MgO / 2 Mg) x (40.31g / 1 mol) = 0.166 g of MgO 0.07g O2 x (1 mol / 32.00g) x (2 MgO / 1 O2) x (40.31g / 1 mol) = 0.176 g of MgO The limiting reagent is Magnesium. Actual yield: 0.17g Theoretical Yield: 0.166 g Percentage
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Ashley Silva Lab 7: Three Stooges in Chemical Reactions Objective: The purpose of this lab is to experimentally determine the equilibrium constant‚ Kc ‚ for the following chemical reaction: Fe3+ (aq) + SCN-(aq) ↔FeSCN2+(aq) Background Information: A system is at equilibrium when the rate of the forward reaction is the same as the rate of the reverse reaction. There is no change in concentration for the reactants or products at chemical equilibrium. When the system is disturbed there
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Please calculate the grams of the excess reagent still remaining in solution. G. Before the advent of Advil and Tylenol‚ did people simply have to “grin and bear it” when it came to pain? One of the most common ancient medicines for pain‚ fever‚ and inflammation came as a byproduct of the willow
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Grignard Synthesis of Triphenylmethanol from Benzophenone Purpose: The purpose of this experiment was to synthesize the tertiary alcohol triphenylmethanol from a Grignard reagent‚ phenyl magnesium bromide. The Grignard reagent was synthesized from bromobenzene and magnesium and then reacted with benzophenone to produce triphenylmethanol. It was important that water be excluded from the reaction‚ in order to prevent the formation of benzene. The reaction of phenyl magnesium bromide and benzophenone
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Biology 181 Ana Marti-Subirana Identification of unknown a-Amylase through testing different temperatures and pH values to detect the absorbance of maltose. Introduction: Enzymes are biological catalysts‚ mainly proteins for this experiment‚ generated by an organism to speed up chemical reactions. They have active sites on which the substrate is attached‚ and then broken up or joined. For this experiment we are going to work with the enzyme a-amylase. Amylase is an enzyme that breaks
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distilled water) iii.20 drops of 1% sucrose solution iv.20 drops of 1% lactose solution v.20 drops of 1% starch solution(1g of starch is added in 99ml distilled water and put in boil) b) Add 3 drops of Molisch reagent to each of the five test tubes‚3 drops of Molisch reagent is added.Each test tube is seal with Parafilm® and each tube is shook to ensure mixing.Then‚the test tube is inclined at 45%
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change observed is usually in shades of blue (as seen in Figure 1) and is darker with higher concentrations of the reactive compounds‚ this colour change occurs because the samples containing polyphenols are reduced by the Folin–Ciocalteu reagent. The reagent will react with any reducing substances in the sample thus making filtration a vital step in sample preparation. The standards used to determine the standard curve (Figure 3) were prepared using gallic acid and 40% ethanol. This is because
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Method • Methodology is performed through 3 successive days: First Day: Trypan Blue cell viability assay: Description Trypan blue staining is a simple way to evaluate cell membrane integrity (and thus assume cell proliferation or death) but the method is not sensitive and cannot be adapted for high through put screening. Short 96 well assay: EACH condition should be done in triplicate or more. Steps 1. Trypsinize one T-25 flask and add 5 ml of complete media to trypsinized cells. Centrifuge
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This reagent can be used to precipitate alkaloids due to the basic in nature of alkaloids. When a few drops of Hager’s reagent were added in the extract‚ a yellow precipitate was formed. Mayer’s reagent (Potassium-Mercuric Iodide) also can used to test the presence of alkaloids. Alkaloids were known to form salt with compounds of mercury. Mayer’s reagent reacts with lone pairs of nitrogen that present in alkaloids to form creamy
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10. The gravimetric determination of nickel in alloys Gravimetric analyses belong to the most precise‚ because contemporary analytical balances make possible determination of the mass of a sample with great accuracy. In these analyses one should obtain high purity compound of the analyzed element or a compound directly obtained from the analyzed substance). This reaction has to be exactly stoichiometric. It is also important that the weighed compound was non-hydroscopic and stable in air‚ it also
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