Author: 213-205-01

Flame Tests		All Names:

Bohr observed that when chemicals were subjected to heat energy or light energy or electrical energy they would emit light of different colours.
He postulated that electrons had a ground state energy level where they were to orbit but could be "bumped up" to a higher energy level to become "excited electrons".
What goes up must come down--back to the ground state--giving off the energy they had absorbed.

Task:
You are to identify the colours that 6 different elements emit upon the addition of heat energy.

Procedure:
•	safely light a Bunsen Burner and adjust to inner blue flame
•	obtain a soaked popsicle stick
•	place end of popsicle stick at the tip of the inner blue flame
•	record the colour
•	place popsicle stick in waste beaker

Construct a table to include:
•	the chemical name
•	the chemical formula
•	the colour given off

Questions:
1.	Can you identify different elements by their flame tests. Explain.

2.	How are each of the aqueous solns of compounds the same?

3.	How are each of the aqueous solns of compounds the same?

4.	What was the independent variable?			_________________________
5.	What was the dependent variable?			_________________________
6.	Why was the flame orange at the end of each test?

7.	Explain HOW different elements give off different colours/wavelengths of light.

8.	How do astronomers use this phenomenon?