1208 WordsNov 9, 20145 Pages

Determining The Percent Copper and Zinc in Pennies From Density
Purpose:
Practicing determine the density of the solution.
Developing the method for determine the percent of density for the solution.
Examining the linear relationship by learning to use the best-fit straight line.
Using the linear relationship to determine the percent of density by the solution.
Be familiar with recording data and observations.
Methods & Material:
Methods:
Weight the mass for the different percent of zinc and copper mixtures, which have 11 groups.
Determining the volume of the zinc and copper mixtures each, and record the data.
Using equation get the density of the pennies. Compare the results.
Find the best-fit straight line.
Material:*…show more content…*

Then calculate the error%=0.01%, and the deviation%=9.74%.
Weight 30 dry pre-82 pennies which get 89.77g, using 30ml initial volume measuring the volume of 30 pennies, record the data 10.0ml. Using equation Density= Mass/Volume, get the density of the pre-82 pennies is 8.98g/ml. Then calculate the error%=0.10%, and the deviation%=1.29%.
Part2: Post-82 Pennies Weight 10 dry Post-82 pennies which get 24.91g, using 30ml initial volume measuring the volume of 10 pennies, record the data 3.2ml. Using equation Density= Mass/Volume, get the density of the post-82 pennies is 7.78g/ml. Then calculate the error%=0.04%, and the deviation%=1.60%. Weight 10 dry post-82 pennies which get 52.31g, using 30ml initial volume measuring the volume of 10 pennies, record the data 7.0ml. Using equation Density= Mass/Volume, get the density of the pre-82 pennies is 7.47g/ml. Then calculate the error%=0.08%, and the deviation%=5.53%.
Weight 10 dry post-82 pennies which get 77.12g, using 30ml initial volume measuring the volume of 10 pennies, record the data 9.1ml. Using equation Density= Mass/Volume, get the density of the pre-82 pennies is 8.47g/ml. Then calculate the error%=0.04%, and the deviation%=7.13%.
Part3: Mixture Zn & Cu 100% Zn:
Weight one piece of Zn, got 4.64g. Using 20ml initial volume measuring the volume of Zn, record data 0.7ml. Using equation Density=Mass/Volume, get the density of 100%Zn is 6.63g/ml.
b. 80%Zn & 20%Cu.

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