1 / 13

SURVEY OF CHEMISTRY LABORATORY I CHEM 1151L FLAME TESTS

SURVEY OF CHEMISTRY LABORATORY I CHEM 1151L FLAME TESTS. CAUTION!!!. BE SURE TO WEAR SAFETY GLASSES AT ALL TIMES IN THE LABORATORY NO EXCEPTIONS TO THIS RULE!. FLAME TESTS. - To explore the line spectra of a variety of elements by heating them in a Bunsen burner flame

adamma
Download Presentation

SURVEY OF CHEMISTRY LABORATORY I CHEM 1151L FLAME TESTS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SURVEY OF CHEMISTRY LABORATORY I CHEM 1151L FLAME TESTS

  2. CAUTION!!! BE SURE TO WEAR SAFETY GLASSES AT ALL TIMES IN THE LABORATORY NO EXCEPTIONS TO THIS RULE!

  3. FLAME TESTS - To explore the line spectra of a variety of elements by heating them in a Bunsen burner flame - The data gathered from the flame colors created by the elements will be used to identify some elements present in unknown solutions

  4. FLAME TESTS - Electrons in atoms, ions and molecules are restricted to specific energy levels - An electron “excited” by some outside energy (flame or electricity) moves from its present energy level to a higher energy level - A photon of light is produced as the electron falls back to its ground state - The light given off is of a specific color since it has a specific wavelength or frequency of light associated with it

  5. FLAME TESTS

  6. FLAME TESTS - A glass prism can be used to identify the various “lines” produced by the photons - The various photons bend differently as light passes through a prism depending upon their wavelength (or frequency) - The smaller the wavelength the greater the bending or diffraction and vice versa

  7. FLAME TESTS

  8. BUNSEN BURNER - Light the Bunsen burner

  9. BUNSEN BURNER - Hold the platinum wire in the flame until it is clean - Position the wire loops at the tip of the blue cone of the flame until little or no color exhibit by the flame

  10. DROPS OF SOLUTION - Place several drops of the solution to be tested in the small crucible dish supplied

  11. SAMPLE VAPORIZATION - Hold the crucible near the air intake of the Bunsen burner Click here to watch video

  12. SAMPLE VAPORIZATION - Plunge the hot wire into the crucible - Sample will be vaporized and carried up the burner and into the flame - Observe and record the color emitted Click on picture to watch video

  13. IDENTIFICATION OF UNKNOWNS - Move to a new location for the next flame test - The burners and wires stay in one location - Be sure to observe all of the seven known samplesand the fiveunknown samples - Match the colors to identify the unknown samples

More Related