Activity 5

1. Run the Build an Atom simulation http://phet.colorado.edu/en/simulation/build-an-atom and build a neutral lithium atom and a neutral boron atom.  Take a picture, or a screen shot, of these two atoms and place them on your blog.  List the number of protons, neutrons and electrons for each. Also look up and post the density for each of the elements on your blog.

Neutral Lithium Atom

Protons: 3

Neutrons: 3

Electrons 3

Density: 6.941

Neutral Boron Atom

Protons 5

Neutrons:5

Electrons: 5

Density:10.811

2. Define density and the equation for density and post on your blog.

Density is the measure of how compact a substance is. The formula for Density is Mass divided by Volume or D=M/V

3. Run the Density simulation http://phet.colorado.edu/en/simulation/density and complete one(your choice) of the prepared Teaching Ideas and post your results on your blog. The activity you choose should be one of the student intended activities.
Activity: Relative Denisty- Sink or Float  By:  Jackie Esler

           

Student Guide for Density Simulation:                              Name: Danielle Anderson______

(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
Wood	F	.40 Kg/ L
Styrofoam	F	.15 Kg/L
Ice	S	.92 Kg/L
Brick	S	2.00 Kg/L
Aluminum	s	2.70 Kg/L

Put the materials in the correct boxes

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? 

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?

                                            

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

____It is so heave and dense that the mass and volume does not affect the density.________

Frame:  The aluminum will _sink__________ in the water because the density of the aluminum is _2.70__kg/L____ and the density of water is ___1.0______kg/L_.  We have learned that _The density of alumunium is more than the density of water so it will not float in water.________________

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. 

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 L	3.38 L	65.14 Kg	19.22 Kg/L	Gold
B	100-L	100.64	.64	.64 Kg	1 Kg/L	Water
C	100-L	104.08	4.8	4.08 Kg	1 Kg/L	Water
D	100-L	103.10	3.10	3.10	1 Kg/L	Water
E	100-L	101.00	1.00	3.53	3.53 Kg/L	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 The bottom of the boxes stopped at about the same area under the water

2nd observation Box C is bigger and had more surface area above the water than Box B

3rd observation Although the size of the boxes were different they had the same density.

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. Your friend could be correct but it depends on the material the boat is made of. Some materials will float better than other materials. If you use the right materials you may be able to put a fridge and tv in the boat without it sinking. ______________________________________________________________________________________________________

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

4. Complete the Mystery Blocks activity on the Density simulation.  Post on your blog the data you collected (mass, volume, and density) and the identification of the material and the known density.

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 L	3.38 L	65.14 Kg	19.22 Kg/L	Gold
B	100-L	100.64	.64	.64 Kg	1 Kg/L	Water
C	100-L	104.08	4.8	4.08 Kg	1 Kg/L	Water
D	100-L	103.10	3.10	3.10	1 Kg/L	Water
E	100-L	101.00	1.00	3.53	3.53 Kg/L	Diamond

5. Identify and post on your blog the Science Standards that could be met through these activities completed in Activity 5

 A.8.1 Develop their understanding of the science themes by using the themes to frame questions about science-related issues and problems

 A.8.6 Use models and explanations to predict actions and events in the natural world

 B.8.3 Explain how the general rules of science apply to the development and use of evidence in science investigations, model-making, and applications

 C.8.1 Identify* questions they can investigate* using resources and equipment they have available

C.8.6 State what they have learned from investigations*, relating their inferences* to scientific knowledge and to data they have collected

 C.8.8 Use computer software and other technologies to organize, process, and present their data

 D.8.1 Observe, describe, and measure physical and chemical properties of elements and other substances to identify and group them according to properties such as density, melting points, boiling points, conductivity, magnetic attraction, solubility, and reactions to common physical and chemical tests