hi need someone to do the experiment and answer the questions

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CHM 1020L
Density

This lab uses the following simulation
https://www.pbslearningmedia.org/resource/arct15-sci-densitylab/density-lab/

If the link does not work for you it can also be accessed using the following link
https://www.simbucket.com/simulation/density-lab/

Learning objectives

1) Understand the concept of density
2) Relate the value of density of a substance to the physical characteristics of the

substance.
3) Predict the effect of volume on density of pure substances
4) Predict the effect of mass on density of pure substances
5) Organize a given list of substances from least dense to most dense with supporting

evidence.
6) Apply knowledge gained in the experiment to explain relevant real-world situations.
7) Apply knowledge gained in the experiment to create a density gradient column.

Introduction
Density is a characteristic physical property of a substance which means each substance has its
own characteristic density that can use used to identify it. All substances have density including
parts of the human body. Have you heard of the term osteoporosis? This happens when the
density of human bones reduces, making them susceptible to fractures1.

Lets get oriented first : )

Go to the following website

https://www.pbslearningmedia.org/resource/arct15-sci-densitylab/density-lab/

You need not download the simulation but if you click on it, it will open on your computer.
If you have technical issues please reach out to FIU Online technical help to get the issues
resolved in a timely manner (details on how to reach FIU technical help are on the course
homepage).

Once you have the simulation open it should look like the figure shown below. Examine the
figure shown below and ensure that you identify the parts on the simulation that are clearly
marked. This will allow you follow directions and to perform the experiment stress free

1Chemistry a Molecular Approach, Nivaldo Tro, second edition (2011)

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Please familiarize yourself with the following parts of the simulation (play with the simulation a
bit to familiarize yourself with it)

1) Button to select water as the liquid
2) Check to see if the fluid density is 1.00 g/mL if you already selected water as your liquid.
3) Reset button
4) Balance to check mass
5) The display that shows you the mass of the material
6) Meniscus for volume
7) Location to choose materials to determine density
8) Location to change mass
9) Location to change volume

Procedure
Part 1 – Let’s define some terms first
Initial volume – volume of just the water (without the red block in the water)
Final volume – volume with the red block in the water
Change in volume = Final volume – initial volume (this should be a number greater than zero)

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Section 1 – Relationship of mass and volume
1) Press the reset button (label #3) to clear the simulation
2) Press the “Turn fluid into water” button (label #1)
3) Check to ensure the fluid density is 1.00 g/mL since we are working with water (label #3)
4) Notice that the red block is floating above the water.
5) Move the blue mass button to around midway until the red block is completely

submerged in the water.
6) Note down the final volume of the meniscus in mL (volume with the red block in the

water) in Table 1
7) The balance should be at 0.0 grams – please check that.

8) Then take the red block and move it onto the balance taking care to place it in the center
of the balance.

9) Leave the red block on the balance for now.
10) Record the mass of the red block in Table 1.
11) Is there a change in volume? Note down the initial volume of the meniscus in mL. (volume

of just the water ….without the red block in the water)
12) Enter the initial volume into Table 1

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13. You have completed one observation.

Second observation
14. You need to change the mass by moving the blue ball a little to the right and go thought steps
1-12. This will be observation 2.

Third observation
15. Then you need to change the mass one more time by moving the blue ball a little more to the
right and go through steps 1-12. This will be observation 3.

Fourth Observation
16. Next move the blue ball all the way to the right so that the block sinks to the very bottom. go
through steps 1-12. This will be observation 4.

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Fifth Observation
17. Remember you need two more observations making sure that the red block is submerged in
the water. So keep the blue ball to the very right and make changes with the volume by moving
the red ball only, making sure that the red block is submerged in the water.

Complete observation 5 by changing the volume and not the mass

Sixth Observation
18. Remember you need two more observations making sure that the red block is submerged in
the water. So keep the blue ball to the very right and make changes with the volume by moving
the red ball only, making sure that the red block is submerged in the water.
Complete observation 6 by changing volume again one more time but not the mass.

Table 1
Effect of changing mass and volume on density (make sure you include units)

Observation
number

Mass Final
volume
(Vf)

Initial
volume
(Vi)

Change in volume
(DV) = Final volume
(Vf) – initial volume
(Vi)

Mass/DV
(Do the
calculation
and plug in
the number)

1

2

3

4

5

6

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Part 2 – Density of same material when you change the liquid

1) Press the reset button (label #3) to clear the simulation
2) DO NOT Press the “Turn fluid into water” button (label #1) yet. It should instead say fluid

density is 2.5 g/mL
3) Move the blue mass button and the red volume button around until the red block is

completely submerged in the water.
4) Note down the final volume of the meniscus in mL (volume with the red block in the fluid)

in Table 2
5) The balance should be at 0.0 grams – please check that.
6) Then take the red block and move it onto the balance taking care to place it in the center

of the balance.
7) Leave the red block on the balance for now.
8) Record the mass of the red block in Table 2.
9) Is there a change in volume? Note down the initial volume of the meniscus in mL. (volume

of just the water ….without the red block in the water)
10) Enter the initial volume into Table 2
11) Next Press the “Turn fluid into water” button (label #1)
12) Check to ensure the fluid density is 1.00 g/mL since we are working with water (label #3)
13) Do not touch the red and blue buttons
14) Repeat steps 4-10 and enter the data into table 2

Table 2
Effect of changing fluid on density (make sure you include units)

Obs
#

Fluid density Mass in Final
volume
(Vf) in

Initial
volume
(Vi) in

Change in volume
(DV) in ___ = Final
volume (Vf) – initial
volume (Vi)

Mass/DV
(Do the
calculation
and plug in
the number)
Units?

1 1 some other
liquid (fluid
density = 2.5
g/mL)

2 water (fluid
density = 2.5
g/mL)

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Section 3 – Density of various materials in water
For each material you can choose (label #7) please follow the same directions.

I am using ??? as an example to show how you need to work with the simulation to gather data.

1) Press the reset button (label #3) to clear the simulation
2) Press the “Turn fluid into water” button (label #1)
3) Check to ensure the fluid density is 1.00 g/mL since we are working with water (label #3)
4) Note down the initial volume in the meniscus in mL
5) Choose “???” from the panel (label #7) and a unknown (green colored) bar should appear

inside the beaker.

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6) Is there a change in volume? Note down the final volume in the meniscus in mL.
7) The balance should be at 0.0 grams – please check that.
8) Then take the gold bar and move it onto the balance taking care to place it in the center

of the balance.
9) Write down the mass of the unknown (???) bar.
10) Enter all the values into Table 3

11) Repeat steps 1-10 to get similar data for the gold, lead, foram, ice, iron, wood, and
rubber and enter them into table 3.

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Table 3
Examining different materials (don’t forget the units)

Material
being used

How does the
material behave
when immersed
in water

Mass Final
volume
(Vf)
Initial
volume
(Vi)

Change in
volume (DV) =
Final volume
(Vf) – initial
volume (Vi)

1

unknown

2

3

4

5

6

7

Swamy Florida International University

CHM 1020L

Density

This lab uses the following simulation

https://www.pbslearningmedia.org/resource/arct15-sci-densitylab/density-lab/

If the link does not work for you it can also be accessed using the following link

Density Lab

Learning objectives

1) Understand the concept of density

2) Relate the value of density of a substance to the physical characteristics of the substance.

3) Predict the effect of volume on density of pure substances

4) Predict the effect of mass on density of pure substances

5) Organize a given list of substances from least dense to most dense with supporting evidence.

6) Apply knowledge gained in the experiment to explain relevant real-world situations.

7) Apply knowledge gained in the experiment to create a density gradient column.

Cite your sources for each answer at the very end of the document even if you think something is common knowledge – a video/ a website etc.

1) What is the density of water generally and how do you know this?

2) In the experiment what precautions must you take to ensure that your experiment gives you the correct results?

3) In real life can you move an object out of water, onto a balance and expect to get the correct mass of the object? Why or why not? Please explain.

Observations and Post-Lab questions

Table 1

Effect of changing mass and volume on density (Don’t forget the units)

1) Average values (Add all six values of mass/V calculated above and divide by the number 6)

2) Make a scatter plot with mass on the Y axis and change in volume on the X axis. Add a straight line and show the slope on the line. Have the line pass through the origin.

3) Is there any correlation between the slope of the line in the graph and the average you previously calculated?

4) What effect does changing the mass of the solid cube in the container have on the density of the material? Explain your reasoning as to why this effect is seen?

5) What effect does an changing the volume of the liquid in the container have on the density of the material? Explain your reasoning as to why this effect is seen?

6) In your own words, define density.

Table 2

Effect of changing fluid on density (don’t forget the units)

Mass in

Final volume
(Vf)

Initial volume
(Vi)

Mass/V
(Do the calculation and plug in the number)
Units?

5) Does changing the density of the fluid being used to measure the volume change to determine the density of the solid block make a difference? Explain your reasoning!

Table 3

Examining different materials (don’t forget the units)

Change in volume (V) = Final volume (Vf) – initial volume (Vi)

1) Speculate on the identity of the unknown material and clearly explain how you came to this conclusion showing all your calculations (maybe you can use a table to explain the calculations).

2) When you were testing these materials did groups of materials behave compared to another group? Please explain in detail what you observed and your reasoning behind separating the materials into these two groups?

3) Arrange all the materials in the panel (except the unknown) from highest to lowest density.

4) I want you to pay particular attention to the way ice behaves in this simulation. What did you notice about how ice behaves?

5) How did this property of ice contribute to the Titanic disaster?

6) This same property of ice allows marine life to exist in Antarctica during the winter. Explain how this is possible.

7) The relationship between solid ice and liquid water is special because there is something unique with respect to density. What is that?

Sources used: Cite your sources below