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Homework:
Homework:
- No worksheet tonight, instead. . . .
- Read Section 4.2 taking notes and answering section questions
- Flame Test Lab Report Due Friday (format below)
Name
Block
Date
Lab Partners: Partner 1, Partner 2
A very good title (What was manipulated? What was observed? What was studied?)
Purpose:
In a single paragraph write the purpose for this experiment. (Minimum of 5 sentences)
Data:
Put a title for your data table here.
HEADING | HEADING | HEADING |
Questions:
1. Based on your observations from this lab, what is/are the unknown compound(s)? To receive full credit, you must justify your answer with a detailed explanation consisting of no less than 3 full sentences for each unknown. (Write your response below the data table you created)
Answer in bold font.
2. Is a flame test a qualitative or quantitative test for the identity of an unknown compound? Explain.
Answer in bold font.
3. If you look at the stars at night you will find that some stars are different colors than others. Stars release different amounts of energy during their lives. How might astronomers use line spectra to distinguish the ages of certain stars?
Answer in bold font.
4. Salts consist of a positive metal ion and an anion (an ion with a negative charge). An example would be NaCl – sodium metal (Na+) with a chloride anion (Cl-). When doing this lab, do you think it is important to use salts with the same anions. Why or why not?
Answer in bold font.
5. When a glass rod is heated, a yellow-orange flame is observed around the point of heating. What does this yellow-orange flame indicate? Why is it observed when glass is heated?
Answer in bold font.
6. Use the Rydberg equation to calculate how much energy is necessary for an electron to occupy the n=1 shell of a hydrogen atom. (Give your answer in proper scientific notation with 3 significant figures.)
Do NOT type this answer. Write the answer in by hand.
7. Use the Rydberg equation to calculate how much energy is necessary for an electron to be excited from the n = 1 shell to the n = 2 shell of an atom. (Hint: ΔE = Efinal - Einitial, Use your answer from above as the initial value for energy and use n=2 to calculate the final value for energy.)
Do NOT type this answer. Write the answer in by hand.
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