1. CHEMISTRY OCTOBER 9, 2014 LAB 03 - Density

2. LAB Starter Read the Pre-Lab and answer the following: – Make a prediction about the density of oil and water based off the Pre-Lab reading – Write the density formula You have 2 minutes to read and answer the 2 questions. You are silent and seated.

3. OBJECTIVE SWBAT – Apply the formula of density – Explain how density can help them predict how a liquid will behave. – Apply density to explain a real-life event

4. AGENDA – Pre-Lab – Lab

5. IMPORTANT DATES Test 01 – Friday

6. Lab 03

7. Density of Liquid Do you think oil and water have the same density? Which one would float? Why?

8. Water Data (#A-C) DescriptionData Values A. Mass of graduated cylinder (g) 28.0 g B. Volume of water (ml)9.0 ml C. Mass of water and graduated cylinder (g) 36.8 g D. Mass of water only (C-A) in gram E. Density of water (g/ml)

9. Oil Data DescriptionData Values F. Volume of oil (ml)8.0 ml G. Mass of oil and graduated cylinder (g) 35.3 g H. Mass of oil only (G- A) in gram I. Density of oil (g/ml)

10. Syrup Data DescriptionData Values J. Volume of syrup (ml)8.0 ml K. Mass of oil and graduated cylinder (g) 38.9 g L. Mass of syrup only (K-A) in gram M. Density of syrup (g/ml)

11. Isopropyl Alcohol Data DescriptionData Values N. Volume of alcohol (ml) 10.0 ml O. Mass of alcohol and graduated cylinder (g) 36. 7 g P. Mass of alcohol only (O-A) in gram Q. Density of syrup (g/ml)

12. The Liquid Layer Prediction

13. The Liquid Layers - Prediction

14. The Liquid Layer Experiment

15. The Liquid Layers – Actual

16. CONCLUSION Did conclusion supports prediction? Why or why not?

17. MENISCUS Read the graduated cylinder by reading the meniscus (the lowest portion of the convex dip of the liquid) – Meniscus form because of adhesion force is stronger than cohesion force

18. Application Assume that a test tube was filled with mercury (a liquid metal with density 13.6 g/mL), water (density measured above), and maple syrup (1.4 g/mL). Draw a diagram to show how the liquid will be layered. Make sure to label the diagram. Support your drawing with evidence. Write 1-3 sentences. Make sure to include a discussion with density.

19. DRAWINGS

20. Bringing it in Let revisit the Exxon Valdez Oil Spill. – Do you think your prediction is still valid after what you have learned and observed in class? Why or why not? Provide support using the word density.

21. Exxon Valdez - continue Explain how the density of the liquid (oil and water) could have negative impact on the wildlife, especially the birds. Explain in 2-4 sentences using support from the experiment.

22. CLEAN UP CLEAN UP AROUND YOU Material managers – bring the equipment back to the Lab Bench