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

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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. - PowerPoint PPT Presentation

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<ul><li><p>Tuesday, Sept. 10th: A DayWednesday, Sept. 11th: B DayAgendaCheck lab write-upsLab: Counterfeit Pennies Discussion/Safety/QuestionsConduct LabCalculations/Graph/Conclusions</p><p>Homework: Complete lab, due next time</p></li><li><p>Lab: Counterfeit Pennies DiscussionThe 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.</p></li><li><p>Lab: Counterfeit Pennies DiscussionBe 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)</p></li><li><p>Lab Write-Up: Counterfeit PenniesAfter your reflection statement, include a data table that looks like this: Data Table #1</p><p>YearTotal Mass of PenniesUsed(g)Volume of Water to Start(mL)Total Volume of Water + Pennies(mL)Change in Volume of Water (mL)Density (g/mL)</p></li><li><p>Lab: Counterfeit Pennies AnalysisAfter conducting the lab, the whole class will compile their data to create another table:</p><p>Note: you will need a lot more lines than shown here</p><p>YearDensity (g/mL)</p></li><li><p>Lab: Counterfeit Pennies AnalysisAs 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</p><p>From this graph, you should be able to determine the year that the pennies changed composition.Density (g/mL) Year</p></li><li><p>Lab Write-Up: Counterfeit PenniesConclusion 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?</p></li><li><p>Lab: Counterfeit Pennies Safety ItemsEven 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!</p></li><li><p>Lab: Counterfeit PenniesWhen finished, staple graph behind lab handout and put behind the Lab Techniques lab in the right-hand side of your lab folder.</p><p>Completed lab will be due next class period</p><p>We will finish chapter 1 and cover section 1.3 next time</p></li></ul>

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