Lab Report Format for AS Chemistry
Lab Report Format for Chemistry II – Copper Cycle Lab
Cover page o
Lab Title, Lab Date, Student Name, Chemistry II,
Lee’s Summit High School
Title:
Copper Cycle Lab
Introduction:
see lab sheet
Materials:
see lab sheet
Procedure:
see lab sheet
Data/Observations:
for the Copper Cycle lab see below starting at data table
Data Table:
copy this from your data/journal collection throughout the lab
Be sure to number each observation
1 10:30 AM -- Copper wire weighed 2.07 grams.
10:45 AM -- Added 25.0 mL of 6.0 M HNO
3
to the copper wire.
2 Reaction bubbled, reddish-brown gas was given off, solution turned a clear blue, copper wire disappeared.
Observations:
Describe what was observed for the following, be sure to include the number from your observation/data table for which this information was obtained.
1. Addition of HNO
3
2. Addition of 50 mL of water
3. Addition of NaOH
4. Addition of Heat
5. Addition of H
2
SO
6. Addition of Zinc
4
Qualitative Observations: List three specific qualitative observations from this lab.
Quantitative Observations: List three specific quantitative observations from this lab.
Calculations:
Calculate the percent yield of the experiment by dividing the mass of copper recovered from the experiment by the original mass of copper, and then multiplying by 100%. (As always, show your work.)
Analysis and Conclusion:
this is covered in questions see below
1. Write out and balance the 5 reactions involving copper in this experiment. (Include states of matter.)
2. What reactions were metathesis/double replacement reaction reactions in the lab?
3. What reactions were oxidation reduction reactions in the lab? What is/are the oxidizing agent, what is/are the reducing agent, balance them as if they are in an acidic solution.
4. What is the difference between metathesis and oxidation reduction reactions?
5. Was the first reaction endothermic or exothermic? Explain your response .
6. When sulfuric acid and copper(II) oxide are reacted copper(II) sulfate and water are formed, write a balanced chemical reaction for this process.
7. What is the purpose of adding water and decanting in step #11?
8. What should the maximum percent yield be for any reaction?
9. Describe each of the steps during the experimental procedure where you might have lost some copper. Which one of these steps do you think was the most significant? Why?
10. What impurities might there be in the final product? How would the presence of impurities effect the percent yield calculation?
11. How efficient were you at recovering your initial amount of copper? (Discuss the meaning of your percent yield.)
