To identify the composition of thirteen objects.
By measuring the mass and volume of thirteen objects and plotting on a graph the four slopes of the lines you can determine the four compositions.
It was determined that the composition of the objects were Lucite, Magnesium, Brass, and Aluminum.
Procedure:.
The procedure is as written.
Data and Results:.
Part I.
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Part II .
Exploration.
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Part III.
Concept Extension.
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Graphs: .
See attached graph.
Sample Calculations: .
Volume:.
Volume of Object 13.
V sample = V final - V initial.
Vs = 23.8mL - 23.01mL.
Vs = 0.8mL.
Density:.
Density of Object 13.
D = Mass/Volume .
D = 10.701g/0.8mL.
D = 13g/mL.
Questions:.
1. The four volumes of the blocks are, 0.8mL, 3.2mL, 5.8mL, 10.2mL.
2. No it is not suitable for calculating the smallest block.
3. A better way to obtain a more accurate estimate of the volume for the smallest block would be to use the water displacement theory.
4.a) Using intensive properties will be more useful because intensive properties are exclusive to certain elements and are independent of the amount of the sample you have.
4.b) Color, mass, and temperature are extensive properties because they depend on the amount of the sample present and can be change by physical means.
Hardness and density are intensive properties because they are independent of the amount of the sample.
5.)The property of the sample we found to be the most useful was density.
6. The masses measured, used alone, cannot be used to separate the thirteen samples into four groups because mass is an extensive property which means that many of the samples could have the same mass only because extensive properties depend on the amount of the sample present.
7. The mass and the volume can be used together to separate thirteen samples into four groups because mass divided by volume equals density, and density is an intensive property which means it is independent of the amount of the sample.
8.a) These lines help identify the materials from the from planets, because they show the relationship between the mass and volume of the materials, also known as the density of the materials.
