# 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:

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c. 60%Zn & 40%Cu

Using 4.64g Zn as 60%Zn in the Mixture, calculate 40%Cu, using the result to weight Cu, try to get the mass as close as possible, record the data, which is 3.02g Cu. Using 20ml initial volume measuring the volume of the mixture, record data 1.2ml. Then using the equation density=mass/volume, get the density of this mixture is 6.38g/ml.

d. 40%Zn & 60%Cu Using 4.64g Zn as 40%Zn in the Mixture, calculate 60%Cu, using the result to weight Cu, try to get the mass as close as possible, record the data, which is 6.90g Cu. Using 20ml initial volume measuring the volume of the mixture, record data 1.5ml. Then using the equation density=mass/volume, get the density of this mixture is 7.71g/ml.

e. 20%Zn & 80%Cu

Using 4.64g Zn as 20%Zn in the Mixture, calculate 80%Cu, using the result to weight Cu, try to get the mass as close as possible, record the data, which is 18.54g Cu. Using 20ml initial volume measuring the volume of the mixture, record data 3.5ml. Then using the equation density=mass/volume, get the density of this mixture is 6.62g/ml.

f. 100%Cu

Calculating the mass of 100%Cu, got 23.5g. Using 20ml initial volume measuring the volume of Cu, record data 3.5ml. Using equation Density=Mass/Volume, get the