Flame Tests (T)

• What should you be able to describe by the end of the video?

  How to use flame tests for metal ions
• Why do scientists need to identify unknown compounds?

  Many contain a metal ion
• What is the first step in conducting a flame test?

  Place a small amount of chemical on a wire
• What does the color of the flame indicate in a flame test?

  The metal ion present in the sample
• What are the five metal ions you need to learn for flame tests?

  • Lithium: crimson flame
  • Sodium: yellow flame
  • Potassium: lilac flame
  • Calcium: orange-red flame
  • Copper: green flame
• What color flame does lithium produce in a flame test?

  Crimson
• What color flame does sodium produce in a flame test?

  Yellow
• What color flame does potassium produce in a flame test?

  Lilac
• What color flame does calcium produce in a flame test?

  Orange-red
• What color flame does copper produce in a flame test?

  Green
• What is a major problem with using flame tests?

  Colors can be difficult to distinguish
• How can a mixture of metal ions affect flame test results?

  It can mask the color of the flame
• What is flame emission spectroscopy?

  A technique to identify metal ions using light
• What happens to the light emitted in flame emission spectroscopy?

  It is passed into a spectroscope
• What does the spectroscope do with the light?

  Converts it into a line spectrum
• How can the line spectrum help identify metal ions?

  Positions of lines are specific for each ion
• What additional information can flame emission spectroscopy provide?

  The concentration of the metal ion
• What are the advantages of instrumental methods like flame emission spectroscopy?

  • Rapid analysis
  • Sensitive to small samples
  • Accurate identification of metal ions
• What is one advantage of flame emission spectroscopy over flame tests?

  It is more accurate
• Why is flame emission spectroscopy considered rapid?

  It analyzes samples faster than flame tests
• Why is flame emission spectroscopy sensitive?

  It works on tiny samples of metal compounds
• Why is flame emission spectroscopy more accurate?

  It correctly identifies metal ions better than flame tests
• What is the purpose of the revision workbook mentioned?

  To provide questions on flame tests
• Where can you find questions on flame tests and flame emission spectroscopy?

  In the revision workbook