Density of Four Metals
Ankit Shingala
Dr. Campagnolo
Chemistry H
September 24, 2013
Lab on Density of Four Metals Conclusion In this lab we studied the densities of four different metals using a caliper, a digital scale, and a calculator. Three metals were pure elements like copper, iron, and aluminum. The fourth metal was an alloy which was brass. The purposes of this lab were to demonstrate that different metal elements have different densities, and that alloys have densities somewhere between those elements that compose them. We also calculated the percent errors between the actual densities and the expected densities. The actual density of aluminum was 2.76g/cc with the percent error being 2.67%. The actual density of iron was 7.88g/cc with the percent error being 0.25%. The actual density of copper was 9.07g/cc with the percent error being 1.2%. The actual density of brass was 8.61g/cc with the percent error being 1.9%.
Overall, errors were low, falling between 0.25% and 2.67%. In this lab, there were many possible sources of error which may have impacted results. First, many of the metal samples may not have been cut to exact measurement by machines therefore leading to altered results for the mass of the samples. Second, many of the samples of the metals may have oxidized over time leading to differences. Third, the digital scale may not have been tarred to because the scale was quite sensitive in the fact that the mass of the samples kept changing while measuring due to outside forces like wind and air from breathing. These errors probably led to my results of actual density always being higher than the expected density. In this experiment, we were asked to calculate the number of moles of atoms in one cc of each pure metal sample. The number of moles of atoms in one cc of aluminum was 6.02x1022. It was 8.47x1022 for iron and it was 8.49x1022 for copper. Then, we were asked to find the factor of change between the densities aluminum and copper. Copper was 3.32 times
Dr. Campagnolo
Chemistry H
September 24, 2013
Lab on Density of Four Metals Conclusion In this lab we studied the densities of four different metals using a caliper, a digital scale, and a calculator. Three metals were pure elements like copper, iron, and aluminum. The fourth metal was an alloy which was brass. The purposes of this lab were to demonstrate that different metal elements have different densities, and that alloys have densities somewhere between those elements that compose them. We also calculated the percent errors between the actual densities and the expected densities. The actual density of aluminum was 2.76g/cc with the percent error being 2.67%. The actual density of iron was 7.88g/cc with the percent error being 0.25%. The actual density of copper was 9.07g/cc with the percent error being 1.2%. The actual density of brass was 8.61g/cc with the percent error being 1.9%.
Overall, errors were low, falling between 0.25% and 2.67%. In this lab, there were many possible sources of error which may have impacted results. First, many of the metal samples may not have been cut to exact measurement by machines therefore leading to altered results for the mass of the samples. Second, many of the samples of the metals may have oxidized over time leading to differences. Third, the digital scale may not have been tarred to because the scale was quite sensitive in the fact that the mass of the samples kept changing while measuring due to outside forces like wind and air from breathing. These errors probably led to my results of actual density always being higher than the expected density. In this experiment, we were asked to calculate the number of moles of atoms in one cc of each pure metal sample. The number of moles of atoms in one cc of aluminum was 6.02x1022. It was 8.47x1022 for iron and it was 8.49x1022 for copper. Then, we were asked to find the factor of change between the densities aluminum and copper. Copper was 3.32 times