Cover Pg 2 = Prblm Stmnt, Rsrch, Hypoth Pg 3 = Proce- dure Pg 4 = Data Pg 5 = Analysis Pg 6 & 7 = Conclusion Back Cover, pg 8 = “extra space”

* at least 2!

From 1793 – 1837, the penny was pure copper. For the next 20 years, the penny was bronze, which is copper, tin and zinc. From 1857 – 1863 the cent looked whitish because it was made of copper with 12% nickel. For the next 98 years ( !) the penny was again bronze, except for Because of the need for copper during WW II, the cent was zinc-coated steel in In 1962 the tin was removed from pennies, making them 95% copper and 5% zinc. In 1982 this was changed to 97.5% zinc and 2.5% copper Source: The Composition of the Cent, ion=fun_facts2

Clean up what needs to be done at the end of the lab Wipe down table Return flasks & other equipment to back counter Throw used paper towels into trash. Safety -- be careful about…. -- wear goggles -- wear goggles Operational Definition how the dependent variable is measured number of drops will be one less than overflow number of drops will be one less than overflow Set-up Sketch: How the equipment was used

My Group’s Data Number of Drops – Raw Data Trial 1Trial 2Trial Penny Penny Penny Collaboration Data Number of Drops -- Averages My GrpGrp 1Grp 2Grp Penny Penny Penny I didn’t think water would pile up and make such a big mound on a penny! The 3 pennies really looked different from each other (OK, so I “cheated” b/c this is PowerPoint and I used Google to find pictures instead of making sketches… ) Includes data tables, observations & sketches Observations:

My Group’s Graph Collaboration Graph Both graphs show that the 1943 penny held the most drops, the 1984 held the second highest number of drops and the 1963 penny held the least amount of drops. It can be inferred that the 1943 penny holds more water than the 1963 or 1984 pennies. = graphs & inferences Inferences: