3.10 Identification Of Matter

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3.10 Identification Of Matter

Once you separate a number of substances, you don't always know what each substance is. Here we will learn some of the methods and learn how to use some of them. There are many methods of determining what is what inside of a mixture. Some of the more simple methods are finding the melting or boiling point of a substance to determine what it is. A more complex method is flame ionization. A flame ionization detector absorbs burned substances and detects the concentration of each product of the combustion, yielding an empirical formula. Infrared spectroscopy is a machine that can determine the identity of organic functional groups. &


Questions and Answers
  • 1. 
    I separated a liquid from a mixture, how do I identify it if I have a list of common boiling points?
    • A. 

      Melting point

    • B. 

      Boiling point

    • C. 

      Flame ionization

    • D. 

      Mass spectrometry

  • 2. 
    Select all that apply Which of the following are methods of identification?
    • A. 

      Gas chromatography

    • B. 

      Liquid chromatography mass spectroscopy

    • C. 

      Infrared spectroscopy

    • D. 

      High performance liquid chromatography

  • 3. 
    If I find a cool looking piece of metal in my car and I want to know what it is made out of, which would be the best method for me to find out what it is?
    • A. 

      Infrared spectroscopy

    • B. 

      Melting point

    • C. 

      Chromatography

    • D. 

      Mass spectrometry

  • 4. 
    If I suspect that there are a bunch of different ingredients in the charcoal I use for my grill, I can check to see if the package is being honest by sending the charcoal to be tested in which of these ways?
    • A. 

      Infrared spectroscopy

    • B. 

      Boiling point

    • C. 

      Filtration

    • D. 

      Decanting

  • 5. 
    Nuclear magnetic resonance spectroscopy (NMR) would be of the most use to:
    • A. 

      Identify each liquid in a mixture of liquids

    • B. 

      Identify the chemical structure of one chemical

    • C. 

      Give the molecular weight of a small sample of a solid

    • D. 

      Tell the subtances with similar boiling and melting points to the inserted sample