A screening test is used to reduce the possible number of substances in an unknown sample to a small ...

A screening test is used to reduce the possible number of substances in an unknown sample to a small and manageable number.
 
  Indicate whether the statement is true or false.

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(Question #2) Marijuana is the most widely abused drug in the United States.
 
  Indicate whether the statement is true or false.

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(Question #3) Gas chromatography cannot yield quantitative results.
 
  Indicate whether the statement is true or false.

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(Question #4) Wavelength is the distance between crests of adjacent waves.
 
  Indicate whether the statement is true or false.

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(Question #5) Gas chromatography cannot be considered an absolute means of identification.
 
  Indicate whether the statement is true or false.

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(Question #6) A qualitative analysis determines the percentage of each of the components of a mixture.
 
  Indicate whether the statement is true or false.

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(Question #7) The Dayton Water Survey involved a mail questionnaire to water users.
 
  Indicate whether the statement is true or false