Objective:
The objective of this lab was to calculate the densities of various objects using different techniques.
Procedure:
<ol>
<li value="1"> The mass of the 100-ml. Graduated cylinder was measured without water or rubber stopper.
<li value="2"> The mass of the 100-ml. Graduated cylinder was measured without water but with the rubber stopper.
<li value="3"> The mass of the metal cylinder was measured.
<li value="4"> The 100-ml. Graduated cylinder, with rubber stopper was filled with an amount of water.
<li value="5"> The metal cylinder was placed in 100-ml. Graduated cylinder with water and rubber stopper.
<li value="6"> The new volume of the water and metal cylinder was measured.
<li value="7"> The diameter of the
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. . .
D=(T-I)<em>V
Volume of a cylinder=pr2h r=d/2
Therefore: The density of a metal cylinder. . . .
D=M</em>(p(d/2)2h)
Theory of Water of Displacement: A volume of water was measured. A second volume of water was measured when the metal cylinder was added. The initial volume was subtracted from the second (total) volume to get the volume of the metal cylinder.
D=M/(T-I)
Data:
Metal Cylinder~
Mass of Metal Cylinder- 51.86g
Mass of 100ml. Graduated Cylinder with rubber stopper- 121.04g
. Volume of water- 47.0ml
Volume of water and metal cylinder-53.5ml
Diameter of metal cylinder- 1.20cm
Height of metal cylinder- 5.20cm
Water~
Mass of 100ml Graduated Cylinder, empty- 107.51g
Mass of 100ml Graduated Cylinder with water- 157.95g
Volume of water- 50.0 ml
Temperature of water- 23.0°c
Wood~
Width of wood- 14.40cm
Length of wood- 14.41 cm
Depth of wood- .60cm
Mass of wood- 91.50g
Metal Plate~
Width of metal plate- 15.20cm
Length of metal plate- 15.40cm
Depth of metal plate- .12cm
Mass of metal plate- 97.78 g
Ethanol~
Mass of 10ml Graduated cylinder- 26.21g
Mass of Ethanol and 10ml Graduated cylinder- 30.26g
Volume of Ethanol- 5.08ml
Calculations:
Metal Cylinder~
Displacement: 51.86g/(53.50ml-47.00ml)= 7.98g/ml
because each of the objects displaced the water by 1 mL, their mass over that mL is their density.
This experiment was performed to determine the difference in density between pre-1982 pennies and post-1982 pennies. In addition, we were given an unknown substance and our task was to configure what it was through calculating its volume,mass, and density. Furthermore, we were being introduced to the procedures of displacement in this experiment as well. All together, we were given the task of finding out why there was a difference in density between the two pennies. My partner, Michael Sapawa, and I first had to measure the mass of both pennies using a scale. Then we calculated the volume of the samples with graduated cylinders through the method known as displacement. We then applied our schema and drew out the formula for density, which
Experiment 2 “Density” was about how to measure the mass and volume and determine the density of water, alcohol, and a solid. For this lab, we begin by calculating the mass of empty graduated cylinder and the mass of 25 mL of tap water. After taking the mass of water and cylinder, we record it on “Density of Water: Data Table”. Since we did not have enough time of complete the whole lab, so we skipped the procedure to measure the density of alcohol. We jumped to the next procedure, which was density of a solid. For that we used a copper and it density 8.95. For this lab, my partner and I did not make any mistakes or errors. But, for better improvement I think we should have more time to complete the whole lab. I felt like we was rushing through
Purpose: Weighing objects. Figuring out the density with an object by calculated volume and Archimedes’ Principle.
First, I will get my materials and set up the scale and 10 mL cylinder and refraction cell. I will check the size of the graduated cylinder to find out the volume. (LxHxW) That will equal 40.5mL for volume. I will see how much the cell weighs alone, and then I will 0 out the scale to see how much the water weighs. Then I will see how much the water and the cell weigh together. I will do this for the cell and cylinder. I will check to see if the density I calculated is what it is supposed to be at 1.00.
5. Calculate the mass of the water by subtracting “Mass A” from “Mass B.” Record the mass of the water in Data Table 4.
This experiment was performed to observe differences in density based on the chemical makeup of an object. Pennies minted before 1982, pennies minted after 1982, and an unknown metal sample was tested to see if there were any differences in their densities. Ten pennies from each category and the metal sample were weighed using a scale to find mass and the displacement method was used to find their volumes. The masses and volumes were then used to calculate the densities of the pennies (D=m/v). The density of the pre-1982 pennies were 8.6 g/mL while the post-1982 pennies were 6.9 g/mL. The metal sample’s density was 1.7 g/mL. Following the experiment we were given the real densities of each item to calculate the percent error with the formula
CHM130 Lab 6 Exploring Density Name A. Data Tables Place your completed Data Tables here Part IIIa (3 points) Volume of water in graduated cylinder (mL)10 mlMass of rubber stopper (g)11.15Volume of water and rubber stopper (mL)16.5 Part IIIb (6 points) Volume of water in graduated cylinder (mL)20Mass of iron nail (g)3.66Volume of water and iron nail (mL)20.5 Part IV (20 points) Type of Aluminum FoilMass (g)Length (cm)Width (cm)Volume (cm3)Thickness (cm)Regular.63g15 cm 10.02 cm.21 cm3.0014 cm Heavy Duty.97g15 cm10.01 cm .36 cm3.0024 cm B. Follow Up Questions Show all work for questions involving calculations. Part I Use the concepts/vocabulary of density to explain why the liquids formed layers in Part I of the procedure. (8 pts)
A. Water boils at 100°C at sea level. If the water in this experiment did not boil at 100°C, what could be the reason?
Introduction: Accuracy and precision were the major aspects of the lab. Accuracy is how close the average of the measured values are to the actual value. Precision is the closeness of repeated measurements. In the lab, the aim was to get as close as possible with both accuracy and precision when determining the mass and volume of the spheres. The mass was determined by weighing the spheres on the Analytical Scale and Triple Beam Balance Scale. The volume is determined by measuring with a ruler and by water displacement. The standard
2. In order to calculate the density of a solid or liquid sample, what measurements are needed?
For example, how to physically find the density of an object by finding their mass with a balance and finding the object's volume using the method water displacement. The purpose of the experiment was to find out which metal is used to create post 1982 pennies. Pre-1982 pennies were made out of copper but then the metal used for making pennies changed. The metal used to create pre-1982 pennies was copper. Since the metal used to make pennies changed the density of post-1982 changed.
In the third stage of this experiment, the density of a liquid was determined and compared to known standards. A 100ml beaker was filled to about half-full with room-temperature distilled water. The temperature of the water in ◦C was recorded in order to compare to known standards later. A 50ml beaker was then weighed on a scale in order to determine mass and recorded. A sample of the distilled water with an exact volume of 10ml was then placed in the 50ml beaker using a volumetric pipette. The 50ml beaker with the 10ml of water was then weighed again and the initial mass of the beaker was subtracted from this mass to obtain the mass of the 10ml of water. With the volume and the mass of the water now known, density was calculated using d = m/V and recorded in g/ml. This process was then repeated to check for precision and compared to standard values to check for accuracy. Standard values were obtained from CRC Handbook, 88th Ed.
Volume of water This was kept constant by using a 200 ml beaker to fill up the jars used in the experiment. The uncertainty of the volume of the water was: +/- 10 ml
After that, it is crucial to convert the mass to volume. The water density at a temperature will aid this process. The compliance of the Volume Occupied by 1.000g of Water Weigh in Air table is deemed necessary throughout the comparison.