Activity 5

1.       Lithium- p- 3  n-4  e- 3  Density .534 grams per cubic centimeter

     

 

  Boron- p-5  n-6  e-5   Density: 2.37 grams per cubic centimeter

 

2.       Density is the mass of a substance per unit volume, density= mass/volume

3.        And 4.

(note: “sink” means stays on the bottom)

Google:   Phet Density sim

Start:    1.                                                 

              2.           Click on the first link

     3.           Click on the   button

     4.          Experiment with choosing a material:

material	S=sinker F=Floater	Density given
Styrofoam	float	.15kg/L
Wood	float	.40 kg/L
Ice	float	.92 kg/L
Brick	sink	2.00 kg/L
Aluminum	sink	2.70kg/L

5.    Try to get aluminum to float.      Talk with your partner about this possibility- can you change the mass of the aluminum block without changing the volume of the aluminum block?  No because volume depends on the mass

6.    What do you and your partner notice about the density triangle at the bottom of the box?  Why do you think this does or does not move? I think that it does not move because the density does not change even though the volume and mass are.

                                           

7.                          How does the density of aluminum (2.70 kg/L)  help explain what you see?

 It explains what I see because that is the highest density so it sinks, and then I know that it has the highest density.

Frame:  The aluminum will ____sink_____ in the water because the density of the aluminum is 2.70kg/L  and the density of water is __1___kg/L_.  We have learned that ________________________________________________________

8.    Density  = ----------       “___mass____ over __Volume__ equals _____density________”

In the “Blocks” box, click on Mystery:

Test the boxes in the water- just drag and drop!!!

   

When you have determined which ones sink and float, fill in the data table for each box. 

4.     

Sample	Starting volume of water (A)	volume of water and block (B)	Volume of block alone (difference B-A)	Mass (kg)	Density (kg/L)	What is it most likely made of? (hint: use Show Table for help)
A	100-L	103.38	3.38	65.14	19.27	gold
B	100-L	100.69	.69	.64	.927	ice
C	100-L	104.08	4.08	4.08	1.00	water
D	100-L	103.10	3.10	3.10	1.00	water
E	100-L	101.00	1.00	3.53	3.53	diamond

9. 
  Look closely at green box C and red box D and discuss your observations.

 List three observations you made while comparing the two boxes.

1st observation They had the same density

2nd observation They floated at different levels

3rd observation They were different sizes

10. Dear Students,

I am going to build a boat.  My partner says I cannot put a refrigerator and a television in my boat because that would make it too heavy-and the boat might sink. Then we would be swimming with the sharks!!!!

What would you advise me to tell my friend? Is she right or wrong?  Be sure to give me some evidence based on what you learned from the boxes or other places in this activity.

I would tell your friend that they are wrong, depending on how big your boat is. If your boat is little like a canoe it would sink it because that little of a boat will not hold all that weight. But a bigger boat would hold the weight because they are designed to hold much more weight than that. Even though aluminum does sink, when it has something underneath it, that can hold it, it will not.

…you can write on the back if you need more room to write!       Signed, your teacher

5.    Standards that would go along with this would be science as inquiry, physical science, and science and technology.