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Tuesday, Sept. 10 th : “A” Day Wednesday, Sept. 11 th : “B” Day Agenda

Tuesday, Sept. 10 th : “A” Day Wednesday, Sept. 11 th : “B” Day Agenda. Check lab write-ups Lab: “Counterfeit Pennies” Discussion/Safety/Questions Conduct Lab Calculations/Graph/Conclusions Homework: Complete lab, due next time…. Lab: “Counterfeit Pennies” Discussion.

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Tuesday, Sept. 10 th : “A” Day Wednesday, Sept. 11 th : “B” Day Agenda

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  1. Tuesday, Sept. 10th: “A” DayWednesday, Sept. 11th: “B” DayAgenda Check lab write-ups Lab: “Counterfeit Pennies” Discussion/Safety/Questions Conduct Lab Calculations/Graph/Conclusions Homework: Complete lab, due next time…

  2. Lab: “Counterfeit Pennies” Discussion • The pennies are on the back supply table in plastic cups that are separated by year. • There are 42 cups of pennies, so each group will test 3 or more different years. Test 1 year at a time! • You will use a balance and a graduated cylinder to determine the density of pennies. • When done, make sure to DRY OFF pennies and put back in the correct cup for the next class.

  3. Lab: “Counterfeit Pennies” Discussion • Be careful when measuring the volume of water in the graduated cylinder. Be as precise as possible for the best results. Use a squirt water bottle to get exactly the volume you want. • Find the density by dividing the mass of the total pennies used (g) by the change in volume (mL). Density = mass (g) change in volume (mL)

  4. Lab Write-Up: “Counterfeit Pennies” • After your reflection statement, include a data table that looks like this: Data Table #1

  5. Lab: “Counterfeit Pennies” Analysis • After conducting the lab, the whole class will compile their data to create another table: Note: you will need a lot more lines than shown here…

  6. Lab: “Counterfeit Pennies” Analysis • As part of your analysis, you will construct a graph with year on the x-axis and density on the y-axis using the data table created by the whole class. Title of Graph • From this graph, you should be able to determine the year that the pennies changed composition. Density (g/mL) Year

  7. Lab Write-Up: “Counterfeit Pennies” Conclusion Questions (Complete Sentences!) • What measurements are necessary to determine density? • Based you your graph, in what year did the counterfeit coins appear? • Using Table A-5 in the back of your textbook (pg 829-830), hypothesize which metal was used in the counterfeit coins. • How would mass measurements be affected if the pennies were still wet from volume measurements? • What do you think is the biggest source of error in this experiment? How could you minimize these errors in future trials?

  8. Lab: “Counterfeit Pennies” Safety Items • Even though you will only be using water, you still need safety glasses and aprons in the lab. • Be careful with the graduated cylinders; they are glass and will break if knocked over. • Never put anything directly on the balance pan; use the plastic weigh boat. • Be safe and have fun in the lab!

  9. Lab: “Counterfeit Pennies” • When finished, staple graph behind lab handout and put behind the “Lab Techniques” lab in the right-hand side of your lab folder. • Completed lab will be due next class period… • We will finish chapter 1 and cover section 1.3 next time…

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