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### LabReport

Course: CHEM 111, Spring 2008
School: Tunxis CC
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Word Count: 569

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1 Mike Vitale Vitale Professor Golden CHE*111 7 February 2008 Measurement and Density In this lab the purpose is to determine the density of a sample of matter using three different techniques. The sample matter will be a metal slug and plastic &quot;peanuts.&quot; The techniques we will attempt to use are: Dimensionally, volumetrically, and gravimetrically. Each technique should accurately determine the...

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1 Mike Vitale Vitale Professor Golden CHE*111 7 February 2008 Measurement and Density In this lab the purpose is to determine the density of a sample of matter using three different techniques. The sample matter will be a metal slug and plastic "peanuts." The techniques we will attempt to use are: Dimensionally, volumetrically, and gravimetrically. Each technique should accurately determine the density of the sample inside the plastic container. Water will be a necessary tool because the density of water equals 1.00 gram per cubic centimeter. This means that the mass over the volume has to be equal to make the equation true. I believe that if all of our measurements are made correctly then we can accurately determine the density of each sample. If we are exactly precise the three techniques should yield the same number. Data and Measurements 2.75 Measured Height of Plastic Cup(in.) 7.00 Measured Height of Plastic Cup(cm.) 4.65 Inside Diameter of Plastic Cup(cm.) 21.589 Mass of Cup and Lid(g) 132.114 Mass of Cup, Lid, and Water(g) Sample #1 Measurements (Metal) 86.776 Mass of Sample, Cup, and Lid(g) 190.565 Mass of Sample, Cup, Lid, and Water(g) Sample #2 Measurements (Plastic) 21.889 Mass of Sample, Cup, and Lid(g) 108.476 Mass of Sample, Cup, Lid and Water(g) Vitale 2 Analysis and Calculations: Volume of Plastic Cup Determined Dimensionally (V Calculated Height, h(cm) Inside Diameter, d(cm) Calculated Volume( ) 6.985 4.65 118.816 ) Volume of a Plastic Cup Determined Volumetrically(mL= 106 Volume of Water( ) ) Volume of Plastic Cup Determined Gravimetrically V=Mass/Density 110.525 Calculated Mass of Water(g) 110.525 Calculated Volume( ) Density of a Metal and a Plastic using Water Displacement Metal Mass of sample, cup, and lid(g) Mass sample, of cup, lid, and water(g) Calculated Mass of Sample(g) Calculated Mass of Water w/ Sample(g) Calculated Volume of Water w/ Sample( ) Calculated Volume of Sample ( ) Calculated Density of Sample (g/ ) 86.776g 190.565g 65.177g 103.789g 103.789 6.736 25.085g/ Formula M=86.776-21.589 M=190.565-86.776 V=103.789/103.789 V=110.525-103.789 D=65.177/6.736 Vitale 3 Plastic Mass of Sample, Cup, and Lid(g) Mass of Sample, Cup, Lid, and Water Calculated Mass of Sample(g) Calculated Mass of Water w/ Sample(g) Calculated Volume of Water w/ Sample( ) Calculated Volume of Sample( ) Calculated Density of Sample (g/ ) 21.889g 108.476g .300g 86.587g 86.587 23.938 .013g Formulas M=21.889-21.589 M=108.476-21.889 V=86.587/1 (Density of Water is equal to 1.00) 110.525-86.587 D=.300/23.938 The possible sources of error in this lab were definitely something notable. One major concern of mine was droplets of water left on the scale that was used to way everything. With many different people using the scale it was difficult to keep water from dripping onto it. I believe that this may have affected some of our results. Also, I believe our measurements with the ruler were not entirely accurate. I would think using a ruler would yield an accurate result; however, it seemed that measuring by eye caused some problems. This lab was very interesting and went well overall. There were some sources of error but I believe the results were reasonably close. When it comes to my hypothesis, I was incorrect. The data and calculations clearly state that the processes we performed could not yield the desired results. To me the data collected points to human error. Because we could not make perfectly accurate measurements, we could not determine the exact volume of the plastic cup.
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