Lab 11: Flame Test Lab
During the Flame Test Lab, metallic ions were burned and vaporized to exhibit specific colors. Nine solutions and two unknown solutions were burned and displayed colors ranging from pink to blue.
6. Identify the two unknowns. What are they and how do you know?
Unknown one is LiCl( lithium chloride). Unknown two is KCl (potassium chloride). I know that those are the substances because they share similar elements with the other solutions in their groupings.
7. Copper oxide, CuO, is a black solid. It doesn't look at all like the element copper. What color flame would it produce?
The copper oxide would produce a blue and green color because all of the solutions in the blue/green grouping use copper in their solutions.
Pre-Lab Questions
1. What is the difference between ground state and excited state?
When an atom is in its ground state, it is in its lowest but stable energy level. When an atom is in its excited state, an electron has jumped from its orbital level to another one.
2. What does the word "emit" mean?
Emit means to produce or release something.
3. In this experiment, where are the atoms getting their excess energy from?
The atoms are getting excess energy from the heat.
4. Why do different atoms emit different colors of light?
The atoms emit different colors of light because the energy that was absorbed from the heat emits electromagnetic radiation at different wavelengths.
Data
Analysis Questions
2. What patterns do you notice in the groupings?
The patterns in the groupings are that the solutions with similar colors have similar or same elements.
4. What evidence do you have that atoms of certain elements produce a flame of a specific color?
Solutions with similar element composition produce same colors. For example, CuCl2, Cu2SO4, and Cu(NO3 )2 all contain copper and produce a blue and green flame color.
5. Can a flame test be used to identify a metal atom in a compound? Why or why not? What about a nonmetal atom
A flame test can be used to identify a mental atom in a compound because solutions with similar element composition produce same colors. Flame tests can not be used to identify nonmetal atoms because metals are cations( positive) and nonmetals are anions( negative). The positive metal ions are unstable and regain an ion to become neutral. An electron falls from energy state to a lower energy state which releases a photon. When the photon is released, our eyes see a color that correspond with a metal.6. Identify the two unknowns. What are they and how do you know?
Unknown one is LiCl( lithium chloride). Unknown two is KCl (potassium chloride). I know that those are the substances because they share similar elements with the other solutions in their groupings.
7. Copper oxide, CuO, is a black solid. It doesn't look at all like the element copper. What color flame would it produce?
The copper oxide would produce a blue and green color because all of the solutions in the blue/green grouping use copper in their solutions.
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