Name: Jeff Chudakoff Partners: Alejandra Garcia Date: 2 December 2011 TA: Mengbin Chen Skill Building Exercise #2 Answer the following questions: 1. What does it mean when a polymer is crosslinked? Crosslinked is one manner in which monomers link together. In this method‚ separate polymer chains are connected via bonds between the individual polymer chains. 2. We discussed how polymer linking and structure contribute to its properties. How would you expect the density‚ elasticity
Premium Polymer Molecule Atom
Introduction: In the lab‚ Bromide was combined with trans-cinnamic acid in order to see if the resulting product at the end of the experiment would yield either an erythro- or threo-dibromide. Based on how well this experiment was done there is a possible product that would have a melting point around 95°C‚ threo-‚ 205°C‚ erythro-‚ or somewhere in the middle which would be a combination of the two. The process of refluxing was used to purify the mixture followed by crystallization. In the end
Premium Acetic acid Ethanol Solvent
Nitration of Methyl Benzoate Abstract: This procedure demonstrates the nitration of methyl benzoate to prepare methyl m-nitrobenzoate. Methyl benzoate was treated with concentrated Nitric and Sulfuric acid to yield methyl m-nitrobenzoate. The product was then isolated and recrystallized using methanol. This reaction is an example of an electrophilic aromatic substitution reaction‚ in which the nitro group replaces a proton of the aromatic ring. Following recrystallization‚ melting point and infrared
Premium Benzene Sulfuric acid Organic chemistry
Victoria MacDonald SCH3U Zegil Due May 5th‚ 2017 Magnesium Oxide Lab Purpose: To determine the composition by mass of magnesium oxide‚ the percentage composition‚ and the percentage yield. Hypothesis: The law of definite proportions states that a chemical compound always contains the same amount of proportions of elements by mass. Based on the law of definite proportions‚ the percentage composition of magnesium oxide should be 60.3% magnesium and 39.7% oxygen. Prediction: Based on the law of
Premium Chemistry Oxygen Atom
to benzoate ions‚ which act as the base to form benzoic acid as a solid precipitate. The overall balanced equation is as follows. Yield Calculations: Sodium Benzoate: Hydrochloric Acid: Theoretical: The theoretical yield of Benzoic Acid is 1.298g. The actual yield of Benzoic Acid is 1.251g. The percent yield of this experiment is: Methods/Procedures 1) Weigh and tare a 50 mL beaker‚ then place about 1.5g of sodium benzoate into the beaker. Record
Premium PH Acid
measurable. The main purpose of the lab was fulfilled because for both trials the percent error was fairly low which means this lab was completed with a close eye to directions and held little error. The calculated results for the molar volume of hydrogen gas for Trial One was 25.3 L/mol and Trial Two was 22.8 L/mol. Compared to the Literature value which was 22.4 L/mol these results were very close resulting in a percent error of Trial One being 12.9% and Trial Two only being 1.79%. These results
Premium Oxygen Hydrogen Chemical element
4 – 205.1 White powder Limiting reagent: Trans-cinnamic acid (148.16g/mol) 2.5g/148.16g/mol=0.01687mol Stoichiometry ratio: 1:1 ratio Theoretical yield: Since 0.01687 moles of trans-cinnamic acid therefore following the 1:1 ratio one concludes that 2‚3-dibromo-3-phenylpropanoic acid will be of 0.01687 moles Molar mass = 307.97 g/mol Mass=(307.97g/mol)(0.01687mol)=5.20g Actual yield: Percent yield=actual yield (g) / theoretical yield (g) x 100 % yield = 3.28g/5.20g x100 = 63.08%
Premium Stoichiometry Bromine Chemical reaction
SINGAPORE POLYTECHNIC SCHOOL OF CHEMICAL AND LIFE SCIENCES Diploma in Applied Chemistry with Pharmaceutical Science Organic Chemistry (CP4120/CP4502) Project Preparation and Recrystallisation of Aspirin. AY2010/2011 Name: XXXX Class: DACP 1B/02 Admin no.: P1234567 Table of Contents Page List of illustration
Premium Aspirin Acetic acid Chemistry
bromide was calculated at 1.222 grams/mL with a boiling range of 87-92◦C. The theoretical yield was calculated at 12.847 grams and the percent yield was 72.3 percent. Next was the characterization and assessment of the purity of the
Premium Chemistry University Research
Introduction The Diels-Alder Reaction is a reaction used in organic chemistry that builds rings very efficiently (1)‚ this cycloaddition process allows for the stereoselective formation of cyclohexene rings possessing as many as four contiguous stereogenic centers (3). This reaction occurs without intermediates‚ in a single step‚ which explains the stereospecificity due to substituents not being given the chance to “switch around”. (1)These six membered rings are synthesized by reacting a dienophile
Premium Chemistry Distillation