AQA CHEMISTRY

• Bromine Water


  The test for an alkene. A positive test turns colourless from orange
• Silver Nitrate


  The test for a halogenoalkane. A positive test forms a precipitate AgX
• AgCl

  White precipitate formed when reacted with silver nitrate
• AgBr

  Creamy precipitate formed when reacted with silver nitrate
• AgI

  Yellow precipitate formed when reacted with silver nitrate
• Acidified Potassium Dichromate


  The test for an alcohol. A positive test turns green from orange
• Fehling's Solution


  The test for aldehydes or ketones. An aldehyde shows a positive result, a negative result indicates the presence of a ketone. A positive test turns brick red from blue
• Tollen's Reagent


  The test for aldehydes or ketones. An aldehyde shows a positive result, a negative result indicates the presence of a ketone. A positive test turns silver and reflective
• Sodium hydrogen carbonate


  The test for carboxylic acids. A positive test gives of CO2
• Limewater


  The test for CO2. A positive test turns cloudy
• High Resolution TOFMS

  A machine that is used to detect the mass of a compound in a very precise manner to over 5 decimal places. The substance is ionized and passed through a flight chamber in which the time of flight is measured to enable the measurement of the mass to charge ratio
• Infrared Spectroscopy

  A machine that measures the bonds of a compound through infrared light. Areas of troughs show where the infrared has been absorbed into the molecule, hence having that bond/element present in the molecule. As you can see from the image, there are various troughs that indicate what the overall molecule is

  
• Dilute and concentrated ammonia


  To distinguish between silver halides

  AgCl - dissolves in both

  AgBr - dissolves in conc only

  AgI - doesn't dissolve
• Hydrolysis


  Test for acyl chloride, gives off white fumes of HCl
• Flame test

  Calcium - brick red

  Strontium - red

  Barium - pale green