1. Chemistry: Thickness of Aluminum Foil September 5, 2012

2. Drill 1. How do you determine the thickness/height of something very thin, like aluminum foil?/5 2. What materials would you use to solve this problem?/5 Materials Needed: Pen, Paper, and Calculator/5

3. Objective Students will be able to select appropriate instruments and materials in order to determine the thickness of aluminum foil.

4. Overview: What are we doing today? Calculating the thickness of aluminum foil. To do that we have to learn a couple formulas. You should know how to measure the area of the foil, but we just need the third dimension (height/thickness).

5. Before you can begin, how do you do a lab? Prelab— (Write the answer) 1. What is the area of a rectangular piece of oak whose length and width are 3.20 cm and 2.25 cm respectively?

6. Mass and density 2. If that piece of oak has a mass of 30.0 g and a density of 0.710 g/cm 3, what is its volume?

7. Thickness of the piece of oak 3. What formula do we use to calculate the thickness of the piece of oak? 4. What makes this formula reliable? (What is reliable?)

8. Your task: Materials: A piece of aluminum foil A centimeter ruler A balance Density of Aluminum Foil: 2.70g/cm 3 You will determine the thickness of a piece of aluminum foil.

9. Write your lab Write a hypothesis List materials Create a procedure Include a data table Write a conclusion. Five or more sentences.

10. What is Volume? Volume: the amount of space matter takes up. How do you calculate it? V=L x W x H

11. How can I rewrite the formula? You can rewrite the previous formula (V=LxWxH) Substitute T (thickness) for H (height). V=L x W x T

12. What’s the formula for Area? Area: A=LxW Can you substitute area (A) in the volume formula (V=LxWxH)? V=A x T If we are looking for thickness (T) how can we rearrange the formula? T=V/A

13. What’s another way to determine volume? We can use the density formula: Density=mass/volume D=m/V

14. Let’s rearrange If you have D=m/V Rewrite for V: V=m/d

15. A1 Groups Lab Stations Station 1 Jimmy Nina Amanda Asia Station 2 Aderopo Nick Station 3 Jessica Austin Cody Patty Station 4 Greg Deshane Christine Ryan Station 5 Takiel Jawuan Isiah Raphael Station 6 Deja Joie Autumn Nakia

16. Analysis What is the thickness of Aluminum foil? Was you hypothesis correct or incorrect? Why or why not? How does your data compare to other groups?

17. Extension Percent error

18. Exit Ticket How do you determine the thickness of an object if you are only given a balance, the density, and a ruler? Why did we do this lab? What did you learn?