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  1. C

    Chemistry Paper 4-theory- doubts =D

    Iodoform test?
  2. C

    Chemistry Paper 4-theory- doubts =D

    Yeah suspect 2 is a perfect match for crime scene 1 but not all of suspect 1's dna was found in either crime scene.
  3. C

    Chemistry Paper 4-theory- doubts =D

    If that didn't make sense count the number of hydrogens- it's 9. There's 9 places that the Cl could have been put in so it's 1x9. Hope this helps!
  4. C

    Chemistry Paper 4-theory- doubts =D

    I think it's like this- so in K the reaction is basically the first one right? RCH3 -> RCH2Cl. But you'll notice in the product, there's actually 9 places that Cl could have been put in. It can replace all the hydrogens in the methyl groups. So it becomes 1x9, and the ratio is 21:9.
  5. C

    Chemistry Paper 4-theory- doubts =D

    Enzymes are proteins, right? So in their tertiary structure they have ionic bonds. When the pH is increased or decreased, it affects the ionic bonds in the tertiary structure. This can result in the active site changing and reducing enzyme activity or even denature it.
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