• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Observation Exercise Based On Organic Chemistry

Extracts from this document...


OBSERVATION EXERCISE BASED ON ORGANIC CHEMISTRY: You are provided with three organic compounds H, I and J. H, I and J each belong to different homologous series. Carry out the reactions below and record your observations. In each case make what deductions you can about the functional group in the compound under test. 1.In a fume cupboard. Lace 3 drops of H on a piece of broken pot or a crucible lid and try to ignite it with a wooden splint. Observation Inference The splint ignites, and all of H is burned, leaving no excess liquid, but a yellow mark no the crucible lid. There are double bonds present, which shows that solution H is unsaturated therefore H could be an alkene. ...read more.


This in an oxidation reaction -Unsaturated hydrocarbon. 4. In a fume cupboard. Place 3 drops of I on a piece of broken pot or a crucible lid and try to ignite it with a wooden splint. Observation Inference The flame was of a faint blue colour, there was no soot produced and there was a strong smell present. Saturated hydrocarbon 5. Place 1cm3 of I in a tube and add 1cm3 of dilute sulphuric acid and 10 drops of potassium manganate (VII) solution. Heat the mixture using a water bath. Observation Inference The solution went cloudy when sulphuric acid was added, and orangey brown when potassium added. When heated the orange colour disappears- Decolourisation Potassium manganate is an oxidising agent, and the solution turns almost clear on heating, this shows that a reducing agent is also present. Oxidation has taken place. ...read more.


Place 1cm3 of J in a test tube, add an equal volume of bromine water, cork the tube and shake the mixture. Observation Inference After shaking the mixture, a red layer if formed at the top of the solution and a pale yellow underneath. Underneath is the organic compound and on top sits the bromine water. No double bonds present. It could be a hydrocarbon or an ester. 9. Place 1cm3 of J in a tube add an equal volume of dilute sulphuric acid and 10 drops of dilute potassium manganate (VII) solution. Shake the mixture. Observation Inference There is a dark layer at the bottom and a layer of clear organic compound on top. This shows that the substance is not a reducing agent and has saturated hydrocarbons. Highly saturated aliphatic hydrocarbon. Formulae of: H= alkene I= primary alcohol J=alkane BY HARKIRAT SINGH SOHAL ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Aqueous Chemistry essays

  1. Identification of an unknown organic compound

    This process is called esterification. Carboxylic acid + alcohol Ester + water E.g. Ethanoic acid + ethanal Ethyl ethanoate + water CH3COOH + C2H5OH CH3COOC2H5 + H2O Esters have the functional group of: O // R---C \ O--R R would either be hydrogen or an alkyl group.

  2. Identification of an Organic Unknown.

    Test for carbonyl group Apparatus: * Pipette * Measuring cylinder * Test tube * 2,4 Dinitrophenylhydrazine solution * Water bath Procedure: To 1cm3 of 2,4 dinitrophenylhydrazine add several drops of the unknown substance using a pipette. Heat with a water bath if necessary.

  1. Organic observation exercise

    The precipitate appeared readily in a cold reaction. The iodoform reaction is a useful test for the CH3CO group in carbonyl compounds. An alkaline solution of aqueous iodine when combined with compound Y is cold during the reaction. When the yellow precipitate of triiodomethane was produced, it showed that the presence CH3CO was highly likely.

  2. Organic compound identification.

    = CH4N2O Chemical Tests 1. Dissolve a spatula measure of D in tap water and add an equal volume of NaOH solution. Heat gently and test the vapor evolved with moist red litmus paper and identify the gas. 2. Make up another solution of D as above and test the pH with Universal Indicator solution.

  1. Observation exercise on the compounds of the s-block elements

    Carbonates often have the misleading effect in this test and that is why nitric acid removes this doubt as it reacts with the carbonate to produce carbon dioxide, which would explain the bubbles and the fizzing.

  2. Identification of an organic unknown.

    Phenol - or hydroxybenzene Iron (III) chloride when reacted with phenol will produce a violet/purple colour (in fact, any colour other than yellow indicates a type of phenol is present.) Method - logically explained: Firstly I will need to gather groups that have the same reacting atoms.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work