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A Density of a Substance - Lab Report Example

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From the paper "A Density of a Substance" it is clear that because the percent difference illustrates the accuracy of the experiment conducted, it equivalently signifies the percent of error associated with performing the pertinent experimental steps…
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A Density of a Substance
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Extract of sample "A Density of a Substance"

The difference in the initial and final volumes of liquid used would be the volume displaced through the solid object plunged into the water, and, therefore, it serves as the volume of the material itself. At this stage, given the mass, it may be hypothesized that the mass of pennies divided by the volume displaced or occupied which causes a rise in the water level within the graduated cylinder yields the penny’s density.
Methods and Materials
Type of Metal Used: Early-1985 penny with an accepted density value of 7.18 g/ml.
Initially, a 50-ml graduated cylinder was filled with 20.00 ml of water, and it was carefully recorded. The initial mass of the cylinder and water (combined) was acquired using a top-loading balance and then recorded as the initial reading for the cylinder-balance setup. Pennies were dropped by increments of two where the new volume was read and the new mass was measured using the same balancing equipment each time. This step was carried out repetitively to make a total of five data sets, which includes noting of final volumes and masses (7th and 8th columns) through the addition of previous differences with actual volumes and masses, correspondingly. There were ten pennies dropped all in all, and in order to obtain the experimental value of density for each set of pennies, the following equation was applied:
Density, ρ = [ Mass(2) - Mass(1) ] / [ Volume(2) - Volume(1) ] (in g/ml)
Sample Calculations (using Reps A & B of the table):
Actual Volume = 21.5 ml - 21.0 ml = 0.5 ml
Actual Mass = 115.0 g - 110.09 g = 4.91 g
Density = Actual Mass / Actual Volume = 4.91 g / 0.5 ml = 9.82 g/ml
Final Volume = Actual V1 + Actual V2 = 1.0 ml + 0.5 ml = 1.5 ml
Final Mass = Actual M1 + Actual M2 = 5.03 g + 4.91 g = 9.94 g
Based on the 3rd and 4th columns of the first table, beginning with a volume (water) of 20.0 ml and a mass (cylinder + water) of 105.06 g, the amounts (volume and mass) of each succeeding row are subtracted from the corresponding amounts of the preceding row to generate the 5th and 6th column outputs showing actual entries specific for every two-penny increment. Read More
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