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Embed code for: density homelab with fields 2008
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Mrs. Meer Name #
Chemistry Date Period
YOU MUST BE ACCURATE WHEN TAKING MEASUREMENTS
OR THIS EXERCISE WILL NOT WORK!
Gather 10 pennies (They must be minted after 1982!) from home and stack them as a cylinder.
Find the volume of the pennies when they are stacked on top of one another. The equation for the volume of a cylinder is where the r is the radius of the base. Please use centimeters for your measurements of length, taking your measurements to two decimal places. IF YOU ARE NOT CAREFUL WHEN TAKING MEASUREMENTS, YOUR RESULTS WILL BE INCORRECT THROUGHOUT THE ENTIRE LAB!
Calculate the mass of the stack of pennies. If they were minted after 1982, they are 2.5g each.
Repeat the volume and mass determinations for 8, 6, and 4 pennies in a stack.
Enter all your data into the data table below.
Calculate the density of the stack for each trial and enter your data in the table below.
Calculate the Average Volume, Mass, and Density of the stacks and enter your data in the table below.
Trial # of Pennies Radius of base
(cm) Height of stack
(cm) Volume of stack
(cm3) Mass of stack
(g) Density of stack
(g/cm3) 1 10 2 8 3 6 4 4 - AVERAGE Not needed Not needed
Graph your data: mass (y-axis) vs. volume (x-axis) for all four trials. Be sure to label the x-axis with the appropriate numbers. Do this on the separate sheet that is given (by first printing page 3 only) or by using Microsoft Excel (if you know how to use it). If you use Excel, be sure to set the graph up with the x and y axis the same as the given graph on page 3 and include a title.
Draw a best fit line.
Calculate the slope of this line using two points on the best fit line. The equation for slope, m, of a line is
m = (y2-y1)/(x2-x1)
How do the individual trial masses compare to the Average Mass? Is Mass an intensive or extensive property?
How do the individual trial volumes compare to the Average Volume? Is Volume an intensive or extensive property?
How do the individual trial densities compare to the Average Density? Is Density an intensive or extensive property?
The slope of your line should be the same compared to that of the Average Density. Explain why.
Define the term direct proportion.
Define the term indirect or inverse proportion.
Is the ratio of mass to volume (which is density) a direct or indirect proportion?
Would you expect a penny to float or sink in a container of corn syrup (density 1.38 g/cm3)? Support your answer.