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Laboratory exam in class’s graded with good intention, Cheat Sheet of Labour Law

Oakland University (OU)Labour Law
Prof. Tracy E. Ward

Adjustment to the balance oxygen to be added for combustion experiment and alteration to the air pressure result in accumulation of smoke and precipitation of laundry

Typology: Cheat Sheet

2021/2022

Uploaded on 06/13/2023

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M3 Lab Report #2
Ex plori ng Density
Pre-Lab Questions
1. (0.5 pts) Determine the volume of a cylinder if the radius of the cylinder is 1.5 cm and the
height of the cylinder is 3.0 cm. Show your work.
π r2
= *h
= 3.14 * (1.5)2 *3
= 21.195 cm3
2. (0.5 pts) Determine the density of a material if the mass is 104 grams and the volume is
75.0 cm3. Show your work.
Density= Mass/Volume
= 104/75.0= 1.39 g/cm3
Activity 1: Determining the Densities of Regular Solids
Data Table 1
Complete the table below based on Data Table 1: Determining the Densities from your
Investigation Manual. Please note that the table layout is different from the Investigation Manual,
and be careful entering your data. (2 points)
Measurement Aluminum
(silver)
Acrylic
(clear)
Polyethylene
(white)
Mass (g) 4.38 1.87 1.52
Height (cm) 1.20 1.30 1.20
Diameter (cm) 1.20 1.30 1.20
Radius (cm)
*calculated value 0.60 0.65 0.60
Volume (cm3)
*calculated value 1.36 1.70 1.40
Density (g/cm3)
*calculated value 3.20 1.10 1.08
Activity 1 Post Lab Questions
1. (2 pts) If you were given a rectangular solid instead of a cylindrical solid, what would you do
to determine the density of that solid? Write your answer in a step-by-step procedural form.
- To find the density of the rectangular solid, I will use the density formula, which is
D=Mass/Volume.
- To obtain the mass of the object, I will use a scale to obtain the mass of the rectangular
solid, then record the mass in grams.
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M3 Lab Report

Exploring Density

Pre-Lab Questions

  1. (0.5 pts) Determine the volume of a cylinder if the radius of the cylinder is 1.5 cm and the height of the cylinder is 3.0 cm. Show your work.

π r

(^2) = *h = 3.14 * (1.5)^2 * = 21.195 cm^3

  1. (0.5 pts) Determine the density of a material if the mass is 104 grams and the volume is 75.0 cm^3. Show your work. Density= Mass/Volume = 104/75.0= 1.39 g/cm^3 Activity 1: Determining the Densities of Regular Solids Data Table 1 Complete the table below based on Data Table 1: Determining the Densities from your Investigation Manual. Please note that the table layout is different from the Investigation Manual, and be careful entering your data. (2 points) Measurement Aluminum (silver) Acrylic (clear) Polyethylene (white) Mass (g) 4.38 1.87 1. Height (cm) 1.20 1.30 1. Diameter (cm) 1.20 1.30 1. Radius (cm) *calculated value

Volume (cm^3 ) *calculated value

Density (g/cm^3 ) *calculated value

Activity 1 Post Lab Questions

  1. (2 pts) If you were given a rectangular solid instead of a cylindrical solid, what would you do to determine the density of that solid? Write your answer in a step-by-step procedural form.
    • To find the density of the rectangular solid, I will use the density formula, which is D=Mass/Volume.
    • To obtain the mass of the object, I will use a scale to obtain the mass of the rectangular solid, then record the mass in grams.
  • To obtain the Volume, by using a metric ruler, will find the length, width, and height of the rectangular solid in centimeters, then finding the product of these three measures (lwh), I will obtain the volume of the rectangular solid in cm^3.
  • Following the density formula, which is density= mass/volume, I will calculate and obtain the density in g/cm^3 Activity 2: Determining the Densities of Solutions Data Tables Complete the tables below based on Data Table 2: Density from your Investigation Manual. Be careful when entering your data. (4 points) Solution Volume (mL) Mass of Solution & Graduated Cylinder (g) Mass of Graduated Cylinder – clean and dry (g) Mass of Solution (g) *calculated value Density of Solution (g/mL) *calculated value Distilled Water

10% Sucrose

30% Sucrose

50% Sucrose

Once the densities are all calculated, determine the average density for each solution and record that average in the table below. Solution Average Densities *calculated values Distilled water 0. 10% Sucrose 0. 30% Sucrose 1. 50% Sucrose 1. Activity 2 Post Lab Questions

  1. (1 pt) What happens to the density of a solution as the amount of the solute in the solution increases? (In this case the solute = sucrose.) When the amount of solute increases in mass, the density increases.
  2. (1 pt) Examination of the values for individual densities calculated for each solution should reflect precision. Identify the most precise set of values and the least precise set of values.

Density of the solid objects compared to the density of each solution. If the density of the object is greater than the density of the solution, the object is likely to sink, and vice versa. Aluminum has a density of 3.2 g/mL and the distilled water density is approximately 1.0 g/mL in each measured volume. Therefor the aluminum object is predicted to sink since it has the higher density. With this rational the acrylic cylinder density. Another thing, pattern in the mass is inversely proportional to the volume of the three cylinders, when the mass increases the volume is decreasing and vise versa. In this sense, the cylinders that has the greater mass will likely to float.

  1. (1 pt) Based on your lab results and the patterns observed do you feel that the acrylic cylinder would float in a 60% sucrose solution? Why or why not? Yes, since the acrylic cylinder float in the 50% sucrose solution, it also will likely float since the density of the 60% sucrose solution will be increased due to the mass increment. the acrylic cylinder mass density will be less or close to the solution density in which it will increase its chances to float Conclusion Exercises
  2. (1 pt) If the accepted density for aluminum is 2.7 g/cm3, determine your percent error in this experiment using the average density calculated for aluminum as the measured value. Remember that the numerator is an absolute value of the difference so you can ignore the sign.

% error = ¿^ measured^ value − accepted^ value ∨^

accepted value

x 100 % ¿

% error = ¿^ 3.2−2.7∨^

x 100 % ¿

Percent error = 43%

  1. (1 pt) People float in saltwater more easily than they do in freshwater. In a similar fashion, some objects that sink in freshwater will float in saltwater. Based on these statements, what can be inferred about the density of saltwater versus the density of freshwater? Explain your answer. Based on the above statement, the saltwater is denser than the fresh water. As salt dissolves in water, it increases its mass and hence its density, which makes the saltwater buoyant than fresh water; the relation between density and mass is directly proportional. The fresh water is less dense than saltwater.
  2. (1 pt) When ice is placed in a glass of regular soda pop and allowed to melt without being disturbed, the following three observations are made: a. The ice floats in the soda pop. b. The water from the melted ice remains above the soda pop. c. The ice floats in water.

What can be inferred about the relative densities of ice, water and regular soda pop The ice floating in the soda pop suggests that the density of the ice is less than the soda density. The melted water is less dense than the soda as well. The ice floats in water because water is denser than ice. Conclusively, Water is denser than ice, where the soda pop is denser than both. Images A required part of this laboratory experiment is to capture pictures of the experimental process and results. Click on the icon in each of the boxes below to include the required images for this lab. (2 points) Note : Remember that each image must also include a note card with your name, section number, and course number clearly visible. Failure to submit these images as required will result in a grade of zero for this lab. Review the Inserting Images into a Worksheet tutorial for further instructions. Measured mass of sucrose needed for 50% sucrose solution on the balance showing the proper number of grams Set up and solutions for Activity 2 Final 50% sucrose solution once it is completely uniform Determination of buoyancy for one cylinder in a solution