Exercise 5 Comparing the Reaction Rates of Alkanes and Alkenes Group # 4 Members: Pangan‚ Sam Margarette Perales‚ Angelica Ibay‚ Sophia Irigan‚ Sharien May Sorensen‚ John Antonio Ocan‚ Emmanuel Submitted to: Ms. Ginalyn Cuenca Mr. Neil Abreo Date: December 6‚ 2012 Introduction Alkanes are hydrocarbons with only single bonds between the atoms. Saturated hydrocarbon is the other term for it. They are used as fuels because they are non-reactive and also do not conduct electricity
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Comparing alkanes and alkenes Aim: Is cyclohexane more or less reactive than cyclohexene in the presence or absence of light Hypothesis The cyclohexene will reactive the fastest because being an "ene" it has a electron rich area making it more reactive than cyclohexane but neither one of the will react without light Materials * 4x 250ml conical flasks * 2 rubber stoppers * Aluminium foil * Cyclohexane * Cyclohexene * Bromide water * Measuring cylinder
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Experiment: Comparing reactivities of alkanes and alkenes Aim: To compare the reactivities of an alkane and an alkene with bromine water and a solution of potassium permanganate (KMnO4). Equipment: • 4 test tubes • Test-tube rack • 4 pipettes Safety: safety glasses must be worn to prevent injury to the eyes. Ensure room is well ventilated whilst using the hydro carbons. Method: 1. Place 1 ml of sample A (cyclohexane) into a test tube containing 4 mls of the bromine water solution. Record
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Alkane‚ Alkene‚ Alkyne & Aromatic Learning Objectives 1. 2. 3. Determine the IUPAC name‚ common name and structure of an alkanes‚ alkenes and cycloalkanes. Identify the physical properties of alkanes. Describe briefly natural sources and importance of alkanes Describe reactions of alkanes Propose a mechanism on free radicals substitution 4. 5. 6. Describe the preparation and reactions of alkenes. 7. Propose mechanism on preparation; dehydration of alcohol 8. Define carbocation
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Muhammed Sabah Comparing Reactivity Of Alkanes and Alkenes Aim: To compare the reactivity of an alkane and an alkene Hypothesis: The cyclohexene would react to the bromine water and turn colourless‚ whilst the cyclohexane won’t react. Risk Assessment: What’s the problem? | How do you fix? | How does it work? | Bromine water is corrosive to the skin | Wear gloves | Stops the Bromine water from reaching skin | Cyclohexane/ene is highly flammable | Keep away from naked flames. | No naked
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Practical 2 Reaction of alkane‚ alkene & alkyne Title: Reaction of Saturated and Unsaturated Hydrocarbons Objective: To carry out chemical test to differentiate an alkane and an alkene. Apparatus: dropper‚ test tube‚ hot plate Chemical reagents: bromine‚ toluene‚ cyclohexane‚ cyclohexene‚ acidified KMnO4‚ dichloromethane Method A. Bromine test 1.6 clean and dry test tube were taken and were labelled them A until F 2.1ml of dichloromethane were placed into each test tube 3.1 ml of
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Preparation u Alcohols when heated in presence of H2SO4‚ H3PO4‚ P2O5‚ Al2O3 or BF3 undergo loss of water molecule with the formation of alkene. Conc. H2SO4 180oC H3PO4/P2O5 200oC Al2O3/BF3 350oC CH3-CH=CH2 + H2O CH3-CH2-CH2-OH CH3-CH=CH2 + H2O CH3-CH=CH2 + H2O u u Mechanism: In the first step OH group of the alcohol is protonated in a fast reversible reaction. Unlike OH group‚ protonated OH group is a good leaving group. Step 1: CH3 CH3-C-CH3 + H+ HO CH3 CH3-C-CH3 H2O+
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The Leicester School of Pharmacy Faculty of Health and Life Sciences PHAR1603 Pharmaceutical Chemistry Module Handbook 2014-15 The Leicester School of Pharmacy MPharm (Hons) The Module Team Room Email address Phone (0116 …) Dr G Hall (GH‚ Module Leader) HB2.25n ghall@dmu.ac.uk 257 7278 Dr P Bremner (PB) HB1.03 pbremner@dmu.ac.uk 257 7922 Dr J Dixon HB1.16 jdixon@dmu.ac.uk 207 8117 Prof. Katherine Huddersman (KH) HB2M1 huddzeo1@dmu
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Hydrocarbons – Methane (Alkanes) Introduction to Hydrocarbons – Methane Carbons have the ability to form many different compounds. Compounds of carbon that only contain carbon and hydrogen are known as hydrocarbons. Most hydrocarbons naturally occur in the mixture crude oil. There are three main types of hydrocarbons‚ alkanes – saturated hydrocarbons made up of only single bonds‚ alkenes – unsaturated hydrocarbons with one or more double bond/s‚ and alkynes – unsaturated hydrocarbons with one or
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Alkanes This is the correct chemical term for compounds known as paraffins. They are considered the simplest organic compounds and are a family of chain hydrocarbons having the general formula C2H2n+2. All of the bonds are single bonds (-C-H-‚ and -C-C-). The chains can be straight or branched. The smaller members (less than 4 carbons) are gases‚ while larger ones (five to seventeen carbons) are liquids. Beyond seventeen carbons the alkanes are waxy solids. Structure: The simplest saturated acyclic
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