Test for alkanes and alkenes lab report. Production of Materials‎ 2019-01-14

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Production of Materials‎

test for alkanes and alkenes lab report

Rxns of Alcohols and Phenols The following tests and experiments are designed to illustrate some properties and reactions of alcohols and phenols. Add a small piece of sodium metal to each test tube and note the result. To each tube add a few drops of the substance to be tested. The most common property used to distinguish these hydrocarbons is based on their reaction with other compounds. Procedure To each of two 2 mL portions of concentrated sulphuric acid in separate test tubes add about 10 drops of alkane and alkene, respectively. The net effect is that alkanes have a fairly restricted set of reactions. Also when bromine water was added to cyclohexene, the bromine water decolourised rapidly under room temperature with evolution of hydrogen bromide gas which indicated the presence of an alkene as they undergo addition reaction under these conditions.

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Production of Materials‎

test for alkanes and alkenes lab report

Fehling's or Benedict's Test The reagent in each of these tests is cupric ion, Cu 2+ in an alkaline solution. Test for the presence of hydrogen bromide or hydrogen chloried evolution. Small samples of the liquids are also ignited and the appearance of the flames compared. Test 1-butanol, 2-butanol, cyclohexanol, n-amyl alcohol, benzyl alcohol and t-butyl alcohol and record the results. But when this same mixture was exposed to the sunlight there was an observable colour change.

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CHEM LAB (II) 3

test for alkanes and alkenes lab report

Note the colour and smokiness on the flame in each case. Hydrocarbons from which one hydrogen atom has been removed are functional groups, called hydrocarbyls. On the other hand, bromine adds rapidly at room temperature to alkenes in a reaction which does not require light. Observation Reaction with bromine water Test Observation Inference 1ml of cyclohexane + bromine water + sunlight Orange colour changes to colourless when exposed to light Alkane present 1ml of cyclohexane + bromine water + dark No colour change Alkane present 1ml of cyclohexene + 3 drops of bromine water + shaking Decolourisation of bromine water. Drops of n-butanol was added and heated 5.

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Lab #1: Organic Reactions

test for alkanes and alkenes lab report

This test may be used to distinguish most phenols from alcohols. With bromine water and phenol, the product is 2,4,6-tribromophenol, which has such a low solubility in water that it is often used not only as a qualitative test for phenol but also as a quantitative measure of the amount of phenol present. Alkanes are saturated and do not react with bromine water, so the orange colour persists. Aliphatic compounds are namely alkanes and alkenes. Sulphuric Acid Although alkanes are inert to cold, concentrated sulphuric acid, alkenes react by addition. It is not easily oxidized, and preferably undergoes substitution rather than addition reactions. Aldehyde and Ketone Tests 1.

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Production of Materials‎

test for alkanes and alkenes lab report

Rxns of Aromatic Hydrocarbons Toluene will be used in each of the following experiments. Procedure Place 2 mL of Lucas reagent in each of four test tubes. The Lucas Test The reagent is a solution of zinc chloride in concentrated hydrochloric acid. Sorry, but copying text is forbidden on this website! Record the results on the report sheet. Aliphatic Hydrocarbons All tests should be carried out in dry test tubes, and observations should be recorded on the report sheet as each experiment is performed. The number of possible isomers increases rapidly with the number of carbon atoms.

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CHEM LAB (II) 3

test for alkanes and alkenes lab report

Several simple tests which are based on this difference in reactivity toward oxidizing agents are used to distinguish between the two classes of carbonyl compounds. To another, add a few iron filings, followed by 1 mL of toluene, using the latter to rinse down any filings stuck on the test tube walls. With Bromine Water The hydroxyl group of phenols activates the ring to electrophilic substitution, so that reaction occurs under very mild conditions. Test tube A, C and E were placed in the dark; test tube B,D, and F under the sunlight. To each tube, add one or two drops of 1% ferric chloride solution, shake, and observe the results.

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Production of Materials‎

test for alkanes and alkenes lab report

The reagent is reduced to metallic silver by aldehydes which, in turn, are oxidized to the corresponding acids. Alcohols which are oxidized reduce the chromium to Cr 3+, causing the solution to become opaque and take on a greenish cast. Procedure Place 2 mL of each of the following in separate dry test tubes: ethanol, 1-propanol, 2 -propanol, and orcinol. Procedure Put 1 mL portions of cyclohexane into two separate test tubes. Aqueous Potassium Permanganate Baeyer's Test Alkanes are relatively inert to chemical oxidizing agents such as neutral or alkaline permanganate, where alkenes are readily oxidized at room temperature. The formula of alkene is C.

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Alkane, Alkene Tests (examples, answers, activities, experiment, videos)

test for alkanes and alkenes lab report

Test acetaldehyde, acetone and methyl isobutyl ketone and glucose. The following experiments illustrate some of the fundamental reactions of saturated, unsaturated, and aromatic hydrocarbons. Oxidation Aldehydes are easily oxidized to acids which have the same number of carbon atoms. In this test, an acetone solution of the alcohol to be tested is treated with a solution of chromic anhydride Cr 5+ in sulphuric acid. Aliphatic hydrocarbons are divided into three classes: alkanes have only single bonds, and are said to be saturated; alkenes and alkynes have carbon-carbon double or triple bonds, and are said to be unsaturated.

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Production of Materials‎

test for alkanes and alkenes lab report

An analogous reaction is not possible for ketones, whose oxidation to an acid requires the rupture of a carbon-carbon bond and results in two acids, each with fewer carbon atoms than the original ketone. Bromine Add 1 mL of toluene to a small test tube. Procedure In four separate test tubes place 0. Both hydrocarbons produce carbon dioxide and water during combustion test. Test phenol, resorcinol and 2-propanol, and record the results. Aromatic hydrocarbons arenes , alkanes, alkenes, alcohol, esters and alkyne-based compounds are different types of hydrocarbons.

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