Lab 11: Flame Test Lab

Lab 11: Flame Test Lab

Summary: 

The purpose of this lab was to find out what the two unknown compounds were by putting the soaked wooden splints under the flame and to see what color it emitted. We did this for 9 other compounds to see the color it emitted and to compare it against the unknown to find out what they were. 

Identity of Unknown 1&2:

The identity of unknown 1 was Lithium Chloride (LiCl)

The identity of unknown 2 was Potassium Chloride (KCl)



Pre Lab:

The difference between ground trip and excited state and ground state is when it is in an excited state the atom/ion jumped to a higher energy level and it is unstable, while a ground state is stable and in its lowest energy level unlike the excited state.

The word emit means to release or give off something like when electrons emit radiation and wavelengths.

The atoms get their excess energy from being heated at the high temperatures when the electron absorbs energy and jumps to higher energy levels.

Different atoms emit different colors of light because of the composition of the chemical characteristics are shown in the colors when it gets evaporated by the heat/flame.

Analysis Questions:

2. The patterns I see in the groupings are that the compounds that gave off a yellow/orange flame were mostly ones with either Na or Cl while the ones that gave off more of a blue/green flame were combined with a Cu. I believe that the Strontium gave off the red in the SrCl2, Lithium gave off the hot pink, and the Potassium gave off the purple when they were all combined with their compounds.

4. The evidence that I have, that atoms of certain elements produce a flame of a specific color is that the flames were different from one another and they produced different colors because of the combinations with certain elements. 

5. The flame test can be used to identify a metal atom in a compound because when the compound is heated up when it absorbs the heat energy the metal atoms go to an excited state and when it goes back it emits a color, while nonmetal atoms cannot be excited meaning the flame test would not work for it and you cannot identify nonmetals to a certain flame. 

6. The identity of unknown 1 was Lithium Chloride, I know this because when putting the first unknown over the flame, it emitted a hot pink color that was the same as the LiCl we saw before. The identity of unknown 2 was Potassium Chloride, I know this because when putting the second unknown over the flame, it emitted a blueish purple color that was the same as the KCl we tested earlier.

7. The color flame that CuO produces is a blue/green flame since like all the other flames with coppers also produce a blue green flame. 







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