TEACHER’S GUIDE CHEMISTRY TOPIC: OBSERVATIONS AND EXPERIMENTS USEFUL TIPS: Student’s experiments can be done in groups. Groups can be given different mixtures. Each group then carry out their own experiment‚ makes a write up of their procedure and presents to the rest of the class together with the samples obtained. UNIT 1: MIXTURES AND PURE SUBSTANCES This unit is suitable for senior one (S1) BRIEF DESCRIPTION OF THE UNIT: This unit deals with: • Methods of separating
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radical is more selective. Since bromine is more selective‚ it is used in most experiments. Conclusion The predicted reactivity of the five hydrocarbons in free-radical chain bromination in increasing order was ethylbenzene (9)‚ toluene (8)‚ methylcyclohexane (13)‚ cyclohexane (12)‚ and tert-butylbenzene (11). This hypothesis was a result of the fact that benzylic hydrogen atoms react faster than aliphatic hydrogen atoms and aliphatic hydrogen atoms react faster than aromatic hydrogen atom atoms. The
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ring taken together constitute a new parent name. Four important examples are: CH3 OH NH2 COOH F F F Fluorobenzene * Because all H atoms in benzene are equivalent it doesn’t matter at which vertex of the ring the substituted group is located. F Toluene Phenol Aniline Benzoic Acid (not methyl benzene‚ hydroxybezene‚ aminobenzene‚ carboxyl benzene) Examples: CH3 HO Cl 2- Chlorotoluene F 3- Fluorophenol Note 2: For monosubstituted benzene rings that have a group attached that is not easily named
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Gas Chromatography: Purifying alcohol Introduction The goal of this lab is to understand the principles of chromatography by purifying alcohol using fractional distillation. Running standards with gas chromatography we were able to see and calibrate our data to find not only how much ethanol our alcohol attained but also what a mixed unknown sample contained. Chromatography is a way of being able to separate substances in solution that can help not only identify the analytes (the studied
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simple distillation (product: 6.5395g‚ 79.75% recovery). The cyclohexene then underwent a bromination reaction by addition of concentrated HBr and a 30% H2O2 solution‚ followed by an extraction of the aqueous phase. This produced trans-1‚2-dibromocyclohexane (product: 12.8886g‚ 67.34% recovery). The trans-1‚2-dibromocyclohexane was reduced by zinc metal to cyclohexene. The reaction was conducted in water‚ first allowing the reaction to reflux and then isolating the cyclohexene by distillation (product:
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countless children ran away from home life and roamed the city street‚ street children uses glue (H.B Fuller) by sniffing them (glue addicted) as the way to get-away from their real life condition. The misuse one of the adhesives‚ Resistol‚ a toluene base glue‚ by the street children of America‚ where the social economic was taking part of this situation. For years H.B Fuller had been pressure by child advocate groups in Central America and the United States‚ and encouraged the company to minute
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Chemical Engineering Design and Professional Skills B Second assignment M A N U F A C T U R E O F S T Y R E N E Assignment 2 – Monday 28/01/13 You have a provisional flowsheet for a process to manufacture 30 ton/h of styrene from ethylbenzene. This is described below. (It may differ in some details from the one you developed last term – but if so‚ you should use the version described here‚ so that all groups are working with the same‚ correct process.) For Assignment 2 of
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Results/Data: End product weighed 0.109g of cyclohexane and tested positive with bromine test Discussion: In order to perform this experiment‚ a distillation apparatus was assembled. 4.0mL of H3PO4 and 3.0mL of cyclohexanol was placed in the round-bottom flask as sell as 5 drops of H2SO4 and a magnetic stir bar. The flow of water was then started through the condenser and the reaction mixture was heated while the magnetic stir rod began stirring. Once distillation was complete and no more liquid distilled
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dehydration of cyclohexanol was performed in a simple distillation apparatus. As cyclohexene formed‚ it was distilled out of the mixture. Background Dehydration is an elimination reaction of an alcohol that takes place in the presence of an acid catalyst. In this experiment‚ 85% phosphoric acid was used as the acid catalyst. The alcohol dehydration required an acid catalyst and heat and the reaction was conducted in a simple distillation apparatus. Since‚ cyclohexene has a lower boiling point
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Luis Baires English Comp.1 MW 12:30 11/25/2011 Process of making gasoline Gasoline is a flammable liquid that is made from the refinement of petroleum or better known as crude oil. It helps fuel cars‚ farm machinery‚ planes and other type of engines. What is petroleum? It’s a fossil fuel that supplies energy around the world than any other source out there. Petroleum‚ including gasoline is primarily a mixture between hydrocarbons and small amounts of other substances. In 1994‚ its known
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