Lab: Density Block
This lab was to determine the mass of a plastic block using its density and volume. Density is mass divided volume, and volume is length x width x height. I did this by measuring the dimensions of the block, and using these measurements to find volume of the block. With some further calculations, I ended with a final mass of 15 grams.
This lab was very quite simple. My group used: the block, the meter stick, the balance, the given density, and a calculator. With these materials we measured the the block with the meter stick. Using the measurements of 2.52, 2.47, and 2.45, we concluded that the volume in 15.2 g/cm^3. Then, by multiplying 0.96 g/cm^3 (the given density) and 15.2 g/cm^3, we found that the mathematical mass is 14.592. But due to significant figures and the rules that go along with the concept, we determined that our answer would be 15 g. After this, we massed the block using the balance, and found that the actual mass was 15.7 g.
The percent of error from our findings to the actual mass was 4.6%. This met the requirement of <5% of error.
My group fulfilled the purpose of the "Density Block Lab" by meeting the <5% of error. Our prior attempt was not so great. Going through the same process as our successful trial, we had a 13% error. This means that the perosn who is measuring should have a good handle on the measuring and "guesstimating" process used to determine the final digit in the measurement. This lab taught me a lot about of precision has a massive role in higher level lab work. This experience has changed my view of lab work and I can't wait to go at it again tomorrow.
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