Section we calculated the density of three different objects

Section 1: Introduction

            Density
is considered to be a physical property, just like odor, color, and boiling
point. A physical property is a change of state that can be measured or
observed without changing the identity of an object; whereas, a chemical
property is a chemical change of composition or a change of matter which
changes the identity. To compare the two, breaking a bottle is a physical
change and heating sugar to create caramel is a chemical change. Density is
used as a conversion factor between mass and volume. It can also be used to
identify different substances. In order for objects to be made of the same
material, they would need to have the same densities. In this lab, we
calculated the density of three different objects to decide: are these objects
made of the same material?

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Section 2: Procedure

            To begin the lab, my lab group was given three
different objects: a solid-colored grey cube, solid-colored red cylinder, and a
solid-colored purple cylinder. Density is represented by the formula
mass/volume, so we needed to calculate the mass and volume of each object. For
the mass, we just used a top loader scale to get the weight in grams (g). We
determined the volume by using two different methods: displacement and
calculation. To find out the volume using displacement, we used a spill can.
The spill can gave us the volume of the objects by allowing us to measure the
water displaced when the objects were dropped into the can. The amount of water
that was ejected after the drop was the volume of the object. The other method
we used to determine the volume was simple calculation. We used the formula for
the volume of a cube, LxWxH, and the formula for the volume of a cylinder, ?(diameter/2)^2
X L. We used all of this data to calculate the density using the formula
previously mentioned. Error could have occurred when we were trying to find the
volume. We could have used the wrong dimensions or read the displacement
incorrectly. 

Section 3: Results/Discussion

Object

Mass (g)

Volume by Displacement (mL)

Volume by Calculation (cm^3)

Density by Displacement (g/mL)

Density by Calculation (g/cm^3)

Grey Cube

21.996

16.5

18.2

1.33

1.21

Red Cylinder

15.824

15.1

20.0

1.05

0.791

Purple Cylinder

18.847

12.2

14.4

1.54

1.31

            Due to the calculated densities, these three
objects are not made of the same material. Although the solid-colored grey cube
and the solid-colored purple cylinder have similar densities by displacement,
the grey cube being 1.21 g/cm^3 and the purple cylinder 1.31 g/cm^3, they are
not made of the same material. The solid-colored red cylinder had the lowest
density both times. 1.05 g/mL and 0.791 g/cm^3. These results are valid and
reliable because we use two different methods to calculate the volume and we measured
the objects multiple times. Other groups were given different objects and had
different data, but they also concluded that the objects were not made of the
same material. In conclusion, these three objects are not made of the same
material because they all have different densities. 

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