Crystallization and Melting Points Organic Chemistry 221 9/19/2012 Intro/Purpose: The purpose of this lab was to use crystallization to separate a compound from a solvent and be able to choose the best solvent to do so. Then identify an unknown and verify purity using melting points. Solubility contributes to crystallization; because a solute has lower solubility at lower temperatures‚ which makes the solvent separate from the solution as a solid. This process is important to understand because
Premium Solubility Chemical polarity
Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 1) Disregarding stereoisomers‚ how many different enols can the β-diketone CH3 COCH 2 COCH 2 CH3 form? A) 3 B) 1 C) 4 D) 0 E) 2 2) Methylamine reacts with acetophenone to yield the: A) imine. B) enamine. C) acetal. D) amide
Premium Prime number Harshad number
DIFFERENT REACTION WILL YIELDS TO A CONCLUSION OF WHAT IS/ARE THE FACTOR/S OF ELECTROPHILIC SUBSTITUTION ON AN ORGANIC COMPOUND – AROMATIC COMPOUNDS. There are three experiments in this chapter of the laboratory. First is the substitution by bromination. Second is the solvent effect which is dealing in the nature of the solvent. And third is the temperature test. Having this division in the experiment one‚ we can now conclude that substituent in substitution‚ the nature of the solvent polar or
Premium Organic chemistry Solvent Chemical reaction
Experiment 1: Bromination of Acetanilide1 Precautions: Ethanol is flammable Sodium hypochlorite is an oxidizing agent and releases toxic fumes (handle in fume hood) Acetic acid is corrosive‚ harmful if inhaled‚ flammable and can cause burns (handle in fume hood) Gloves are recommended to avoid chemical contact with skin Reaction Scheme: Conversion of acetanilide to p-bromoacetanilide Procedure: To a 125 mL Erlenmeyer flask containing a mixture of 95% ethanol (6 mL) and acetic acid (5 mL)‚ dissolve
Premium Ethanol Acetic acid Solvent
UNIVERSITY OF THE GAMBIA LECTURE NOTES COURSE: PRINCIPLES OF CHEMISTRY II (ORGANIC CHEMISTRY) CODE: CHM 161 2ND SEMESTER SESSION: 2012/2013 LECTURER: ANTHONY F. ADJIVON UNIT 1 INTRODUCTION Organic chemistry started as the chemistry of life‚ when that was thought to be different from the chemistry in the laboratory. Then it became the chemistry of carbon compounds‚ especially those found in coal. Now it is both. It is the chemistry of the compounds of carbon along with other elements
Premium Carbon Atom Petroleum
Alexandra Smith May 27‚ 2012 Cracking Aim: The aim of this experiment is break a larger alkane into smaller alkanes and alkenes. Theory: Fuels made from oil mixtures containing large hydrocarbon molecules are not efficient. They do not flow easily and are difficult to ignite. Crude oil often contains too many large hydrocarbon molecules and not enough small hydrocarbon molecules to meet demand. Cracking allows large hydrocarbon molecules to be broken down into smaller‚ more
Premium Alkene Hydrocarbon Petroleum
Discussion The dehydration of an alcohol to an alkene follows a two step elimination reaction. The first step is determines the rate of the reaction and is dependent on the formation of the carbocation. In this experiment‚ the carbocation intermediate forms as the alcoholic hydroxyl group is protonated with acid‚ and dihydrogen oxide leaves. After this unimolecular dissociation step‚ a proton from one of the adjacent carbons is captured to reform the acid catalyst‚ and the elimination reaction is
Premium Chemistry Alcohol Distillation
Introduction Discovered by Georg Wittig in 1954‚ the Wittig reaction is a robust organic synthesis method for preparing stereospecific alkenes. In general‚ Wittig reactions involve an aldehyde or ketone and a Wittig reagent (triphenylphosphonium ylide) and result in the formation of an alkene product and triphenylphosphine oxide (side product). Stereospecific alkene products can be synthesized by adjusting the reaction reagents and conditions. In the 60 years since the Wittig reaction was discovered
Premium Alkene Aldehyde Chemical reaction
hydrocarbons. Many alkanes are obtained from crude oil by fractional distillation. The smallest alkanes are used extensively as fuels. Apart from burning‚ however‚ they are remarkably unreactive. Alkane Methane Ethane Propane Butane Pentane Alkene Ethene Propene Butene Pentene Alkane Methane Ethane Propane Molecular formula CH4 C2H6 C3H8 C4H10 C5H12 Molecular formula C2H4 C3H6 C4H8 C5H10 Molecular formula CH3OH C2H5OH C3H7OH Display formula Display formula
Premium Alkene Functional group Hydrocarbon
| |Structure and Preparation of Alkenes. | |Elimination Reactions | Summary Alkenes contain the C=C functional group which can be prepared by 1‚2-elimination reactions such as: • dehydration of alcohols (- H2O) or • dehydrohalogenation of alkyl halides (- HX). Zaitsev’s rule indicates that the preferred product is the more highly substituted‚ and therefore more stable alkene. But the rule is not always obeyed
Premium Alkene Organic reaction Alcohol