Chemistry Study guides, Class notes & Summaries

This document answers the following questions: 1. a) Describe any evidence that a chemical reaction occurred when you added 6 M HCl to the solution of sodium acetylsalicylate. b) Explain why the changes that you observed took place 2. Describe and explain the possible effect on your results if you mistakenly extracted the dichloromethane solution with 5% HCl rather than 5% NaHCO3. 3. Show clearly how you calculated your percent recovery. 4. Show clearly how you calculated percent composition of ...

Includes the following questions and answers: 1. Under which class of substitution reaction (SN1 or SN2) does this reaction appear to fall? Explain 2. Considering the two resonance structures of the conjugate base of saccharin, which atom (N or O) bears more of the negative charge? Explain why? 3. What will be the possible effect on your results if you used water as the reaction solvent instead of dimethylformamide (DMF)? 4. Most compounds that contain N-H bonds are basic but saccharin is acidic...

The document answers the following questions: 1. Suppose you carry out a TLC separation of acetaminophen and phenacetin on silica gel using a nonpolar developing solvent. Which would have a higher Rf value and why? 2. What will be the possible effect on your results of the following experimental errors or variations? a) You allowed your chromatogram to develop too long, and you couldn't find the solvent front. b) You marked the starting line with a ballpoint pen. c) When the TLC plate was place...

This document answers the following questions: 1. Show how you calculated the percent recovery of your product. 2. An unknown compount X is one of the three compounds listed below. A mixture of X with benzoic acid melts at 89°C, a mixture of X with phenyl succinate melts at 120°C, and a mixture of X with m-aminophenol melts at 102°C. Give the identity of X and explain your reasoning. 3. Tell how each of the following experimental errors will affect your experimental results (yield, purity, or...

Includes the answers to the following questions: 1. Show clearly how you calculated your percent yield of benzoic acid in this experiment. 2. After mixing the reactants to form a precipitate, the beaker containing the precipitate was cooled in a large beaker containing ice. What is the purpose of this cooling? 3. When you lower the pH of the solution containing aqueous sodium benzoate, precipitate forms. What will happen if you then raise the pH by adding aqueous NaOH? 4. The procedure called fo...

This document will answer the following questions: 1. What gas escaped during the sodium bicarbonate washing? Write balanced equations for two reactions that took place during this operation. 2. Describe and explain how each of the following experimental errors or variations might affect your results. a) You forgot to add sulfuric acid. c) You failed to dry the reaction flask after washing with water (flask used for reflux). 3. The expected yield of isopentyl acetate is 16.7g when 150 mmol of is...

Topics included in this set of notes include the Bronsted-Lowry definition of acids and bases, curved arrow notation, charts of pKa values, acid strength using pKa values, base strength using pKa values, predicting position of equilibrium, qualitative perspectives to determining relative acidity, levelling effect, solvating effect, and the Lewis Acid and Bases defintion. My notes are always in a logical order and different colored pens are used to accentuate important words and topics. This make...

Topics included in this set of notes include bonding patterns in organic chemistry, constitutional isomers, Lewis structures, formal charge, induction and covalent bonds, electronegativity, covalent bonds, hybridization, bond strength, molecular geometry, intermolecular forces (Hydrogen bonding, Dipole-Dipole interactions, London Dispersion forces), and solubility. My notes are always in a logical order and different colored pens are used to accentuate important words and topics. This makes what...

Topics included in this set of notes include examples of different ways to represent molecules, functional groups, identifying lone pairs, three-dimensional structures, resonance, pattern recognition in resonance, relative significance / stability of resonance structures, and delocalized/localized lone pairs. My notes are always in a logical order and different colored pens are used to accentuate important words and topics. This makes what you're looking for easy to differentiate. I have nice pe...