Density post lab 1

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Temple University *

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1024

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Chemistry

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Jan 9, 2024

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2

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Experiment 1: Measurement and Density Post Lab Questions I. Calculations Part A: Set up calculations of the metal cylinder’s radius, volume, and density with your data. Show units. Radius: (1.210 cm)/2 = 0.605 cm Volume: (0.605)^2 * 5 = 5.71 49 cm^3 Density: 9.982g/cm^3 Part B: Set up calculations of mass and density of the 10 mL water sample with your data. Show units. Mass: ( 47.358 g - 37.496 g ) = 9.862 g Density: 9.862 g / 10.00 mL = 0.9862 g/mL Part D: Set up calculations of volume and density of unknown shot with your data. Show units Volume: 37 mL - 31 mL = 6 mL Density: (175.746 g -117.937 g)/ 6.0 mL = 9.6348 g/mL = 9.6 g/mL II. Additional Questions 1. Do your calculated densities from Parts B and C support the idea that density is an intensive property? Why or why not? My calculated densities from part B and C support the idea that density is an intensive property because different sample sizes resulted in the same densities for the same substance. The value of density did not change with the size of the sample. Density is the ratio of its mass to its volume.
2. Compare the calculated densities from Parts B and C with respect to precision of the methods used. Also, how do you know if your values are accurate? My repeated trials resulted in the answers that were very close to each other. So, my results were precise. Also, for the most part my answers were very close to the actual values, therefore I can say that my values were accurate. 3. Is it faster to 1) adjust the liquid level to exactly hit a graduated cylinder measurement mark or, 2) estimate the last digit of precision in reading the volume? Is one more accurate than the other? It is faster to estimate the last digit of precision in reading the volume then adjusting the liquid level exactly because it takes longer to pipet liquid in and out from the graduated cylinder. It is more accurate to adjust the liquid level to exactly hit a graduated cylinder measurement as it would be more precise. 4. Was the volume of the metal cylinder in Part A (calculated from length measurements) or Part D (calculated from displacement) more accurate? Explain your choice. Volume of a metal cylinder calculated by water displacement is more accurate than direct measurement because measuring sides by a ruler may not be as precise and accurate as it is by eye and ruler.
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