How to carry out chemical tests to identify the presence of molecules

Describe how to carry out chemical tests to identify the presence of molecules

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1. If you use the Biuret A+B test to test for a molecule, what colours are produced if positive?

  • Lilac
  • Blue/ Black
  • Blue> Green> Yellow> Orange> Brick red
  • Cloudy / White
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2. If you use iodine to test for a molecule, what colours are produced if positive?

  • Blue> Green> Yellow> Orange> Brick red
  • Cloudy/ White
  • Blue/ Black
  • Lilac

3. If you use the ethanol emulsion test to test for a molecule, what colours are produced if positive?

  • Blue> Green> Yellow> Orange> Brick red
  • Blue/ Black
  • Cloudy/ White
  • Lilac

4. How do you identify the presence of lipids?

  • Ethanol Emulsion Test
  • Iodine solution
  • Biuret A+B test
  • Benedicts test

5. If you use the Benedicts test to test for a molecule, what colours are produced if positive?

  • Cloudy/ White
  • Blue/ Black
  • Blue> Green> Yellow> Orange> Brick red
  • Lilac

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