The Flame Test

Problem: To repeat the flame test that was done by Neils Bohr. -Study fig 11 pg 232 and re-read what Neils Bohr did Materials: Bunsen burner, flask, wooden splints, lighter and chemical solutions

Procedure: 1.At a lab bench, set up a bunsen burner and light it. 2.Place the soaked end of the wooden splint in the hottest part of the flame for 5 seconds. 3.Observe the colour which appears. 4.Go to the next station.

Observations Compound NameFlame ColourElement Present

Observations Compound NameFlame ColourElement Present 1 Copper sulphate greenCopper 2 Potassium iodide violetPotassium 3 Copper (II) chloride greenCopper 4 Calcium Chloride Red-orangeCalcium 5 Strontium Chloride Crimson redStrontium 6 Lithium Chloride RedLithium 7 Potassium Chloride violetPotassium 8 Barium Chloride Yellow-greenBarium 9 Sodium Chloride Orange-yellowSodium 10 Potassium Carbonate violetPotassium

Discussion 1.How could you determine if the element copper was in a certain compound? 2. Based on what you have learned, what colour do you think these solutions would produce: A: Lithium bromide B: Barium Sulfate 3. Burning elements to produce different colours has one commercial use. Can you think of where you may have seen this in action?

Conclusion Based on the reading on pg 232, write a brief conclusion about what is happening to the electrons as the element is heated and what we learned in this lab.