Lab Team Six Stoichiometry of copper

1. Lab Team SixStoichiometry of copper Brittany Hanson & Charlie Jannsen 2nd Period Chemistry March 2002

2. What is the purpose of the laboratory? To Prove Antoine Lavoisier’s Law of Conservation of Matter: “Matter is Neither Created or Destroyed in any Process”

3. Pre-Lab Questions Properties of Cu: • Soft Metal- • Malleable and Pliable • Reddish in Color • Resistant to Corrosion • Reacts with- • Oxygen and Carbon Dioxide

4. Pre-Lab Questions Balanced Equations: Cu + HNO3 Cu(NO3)2 + NO2 + H2O 2Cu(NO3)2 + 4NaOH Cu(OH)2 + 4NaNO3 Cu(OH)2 CuO + H2O

5. Pre-Lab Questions Balanced Equations: CuO + H2SO4 CuSO4 + H2O CuSO3 + Zn Cu + ZnSO4

6. Pre-Lab Questions Safety Hazards: • Burns • Corrosive Chemicals • Toxic Gases

7. Pre-Lab Questions Copper Sulfate: Created from the Copper-Oxide (CuO) and Sulfuric Acid (H2SO4)

8. Pre-Lab Questions Step where Cu is recovered: The Copper is Recovered in Step Eleven When the Final Reaction Produces Cu +ZnSO4

9. Pre-Lab Questions Method to dry final Cu: A Steam Bath is Used in the Final Drying Process

10. Hypothesis If two grams of copper goes through numerous chemical reactions then the initial amount should be recovered.

11. Experimental Design

12. Flow chart Gather Materials 2 grams of Cu in 250mL beaker Add 25 mL HNO3 & cover w/ glass Put beaker in ice bath Add 25mL of NaOH, test pH Add 50mL H2O & boil Let settle, & decant twice

13. Flow chart cont. Add 10g Zn & stir 10min Add 30 mL H2SO2 & swirl Add 20mL H2SO2 after gas ceases Add 50mL H2O & decant Evaporate H2O w/ steam bath Find weight of copper

14. Data Data Table 1 quantitative data

15. Data cont. Data Table 2 quantitative data

16. Data cont. Data Table 2 quantitative data

17. Calculations • Mass of Copper • Final Moles of Copper: • 2.0 g Cu * 1 mol Cu = 0.03 mol Cu 63.55 g Cu • Initial Moles of Copper: • 2.0 g Cu * 1 mol Cu = 0.03 mol Cu 63.55 g Cu • Percentage Recovered: • 0.03 mol Cu / 0.03 mol Cu = 100%

18. Questions Critical Thinking Analysis: 1. Why is the Product Put on Ice? • Because the chemical reaction between Cu and HNO3 produces heat

19. Questions cont. Critical Thinking Analysis: 2. What Type of Reactions Took Place? • Step 4: Double • Step 7: Double • Step 9: Single

20. Questions cont. Critical Thinking Analysis: 3. Problem From Incomplete Reactions? • Equation • Incomplete reaction wouldn’t result in the separation of Cu and H2SO4, because there isn’t an excess of anything, the equation is already balanced.

21. Questions cont. Critical Thinking Analysis: 4.Account for difference in mass of initial amount and Cu reclaimed. • While we retrieved the same mass is our second trial, some of this mass was copper sulfate and not pure copper.

22. Article • Copper • Author Mai Tran • Copper is an essential mineral that plays an important role in iron absorption and transport. Only 70-80 mg of copper are found in the body of a normal healthy person. • Hyperlink to article

23. Thank You for Your Time Any Questions?

25. Calculations cont..

26. Gather Materials

27. Find the Weight of Copper

28. Adding NOH3

29. CuSO4 + Zn

31. Scoring Grade: 4 Content:Class Avg.( ) Mine (3) Few typos! No Conclusion in presentation, analysis of data was a little unclear, excellent presentation until the end - Label axis of graphs Delivery: Class Avg.( ) Mine (4.5) No the names and pronunciation of chemicals. NO2 Visuals: Class Avg.( ) Mine (4.5) Good use of visuals in flowchart-all steps could have been included and would have helped Hyperlinks: Yes- Conlcusion Supported: Unclear due to hyperlink, but YES I believe that it was