Food tests

• What is the first step in preparing a food sample for testing?

  Get a piece of food and break it up using a pestle and mortar.
• Why do you add distilled water to the ground food sample?

  To help dissolve some of the food.
• What tool is used to stir the mixture of food and distilled water?

  A glass rod.
• What is the purpose of filtering the solution?

  To get rid of the solid bits of food.
• What are the steps to prepare a food sample for testing?

  1. Break up the food using a pestle and mortar.
  2. Transfer to a beaker and add distilled water.
  3. Stir the mixture with a glass rod.
  4. Filter the solution using a funnel lined with filter paper.
• What type of sugar does the Benedict's test detect?

  A reducing sugar.
• What is the first step in conducting the Benedict's test?

  Prepare a food sample and transfer 5 cm³ to a test tube.
• At what temperature should the water bath be set for the Benedict's test?

  75°C.
• How much Benedict's solution should be added to the test tube?

  About 10 drops.
• What should you use to place the test tube in the water bath?

  A test tube holder.
• What are the steps to perform the Benedict's test for sugars?

  1. Prepare a food sample and transfer 5 cm³ to a test tube.
  2. Set a water bath to 75°C.
  3. Add about 10 drops of Benedict's solution to the test tube.
  4. Place the test tube in the water bath using a test tube holder.
• What solution is used to test for starch?


  iodine solution
• Who created tests for sugars?

  Benedict's test
• Who made thee test for lipids?

  Sudan III
• What colour is the solution at the end of testing starch?


  black or blue
• If the sample contains starch the colour of solution will change too ?


  Browny orange to black or blue-black
• If the sample contains starch the colour of solution will change too ?


  Browny orange to black or blue-blackBrowny orange to black or blue-black
• What colour does the solution turn when testing for lipids?


  Red
• what will the mixture do?


  separate into two layers
• Who made the test for proteins?

  biuret
• What will the solution colour be at the end of testing for protein?


  Purple
• What solution colour will it be when testing for sugars?


  green yellow or red depending on how much sugar is in the food