Activity 5

11.      Lithium Neutral Atom

       3 protons

       3 neutrons

       3 electrons     

       Density:  0.534 grams per cubic centimeter

    

              

         Boron Neutral Atom

         5 protons

         5 neutrons         

         5 electrons

         Density:  2.37 grams per cubic centimeter

   2.      Density- The difference in weight of two objects that are the same size

         Density=Mass/Volume

   3.        PhET- Density Activity- Funsheet

Custom Section                                                                    Name: Larissa Lewan

Material	Mass (kg)	Volume (L)	Density (kg/L)	Does it Float?
Styrofoam	.75 kg	5.00 L	.15 kg/L	Yes
Wood	2.00 kg	5.00 L	.40 kg/L	Yes
Ice	4.60 kg	5.00 L	.92.kg/L	Yes
Brick	10.00 kg	5.00 L	2.00 kg/L	No
Aluminum	13.50 kg	5.00 L	2.70 kg/L	No

1.      In the custom setting, choose the ‘My Object’ option in the material drop down box.  Set the mass of your object to 4 kg.  Adjust the volume to find the minimum volume needed to make the object float.

    Volume________4.09_L________                Density__________.98 kg/L________

       2.      How does the density of a large piece of aluminum compare to a small piece?

The density of aluminum does not change.

   

      Same Mass Section

Material	Mass (kg)	Volume (L)	Density (kg/L)	Does it Float?
Blue	5 kg	105.00 L	.0476 kg/L	No
Yellow	5 kg	105.00 L	.0476 kg/L	Yes
Green	5 kg	102.5 L	.0487 kg/L	No
Red	5 kg	101.25 L	.0493 kg/L	No

Same Volume Section

Material	Mass (kg)	Volume (L)	Density (kg/L)	Does it Float?
Blue	6 kg	105.0 L	.057 kg/L	No
Yellow	8 kg	105.0 L	.076 kg/L	No
Green	4 kg	104.0 L	.038 kg/L	Yes
Red	2 kg	102.0 L	.019 kg/L	Yes

   3.  Looking at the data on the previous page, what must be true about the density of

     an object in order for it to float?

   The objects density, in order to float, has to be 1 or less than 1.

    Same Density Section:

   4.  Calculate the density of the blue object in this section.

     Mass _____3________         Volume_______103.00________        Density_______.029_________

   5.  Explain why both the yellow and red objects float when they have different sizes.

  They both have the same density 1 that’s why they float.

   Mystery Section:

   6.  Before you start, pick an object that you think will float.  _________c__________________

     Pick an object that you think will sink.  ____________b_____________

Material	Mass (kg)	Volume (L)	Density (kg/L)	Does it Float?
A	65.14 kg	103.38 L	.63 kg/L	No
B	.64 kg	100.64 L	.00635 kg/L	Yes
C	4.08 kg	104.08 L	.0392 kg/L	Yes
D	3.10 kg	103.10 L	.03 kg/L	Yes
E	3.53 kg	101.00 L	.0349 kg/L	No

   

   7.  In the Custom section describe the difference between how Styrofoam and ice  

     floated.  Also explain why you think this is the case?

Because they both had a density less than 1, in order for objects to float they have to be equal or less than 1. And Styrofoam and Ice are both less than one so they both float.

    8.  In the Same Mass Section discuss what was interesting about the blue object’s behavior in the water.

            It’s the same mass as the rest but it sinks.

     9.  In the Mystery Section, click on the “Show Table” button.  What is the most dense   

     object on the list?  Write its density as well.

            The most dense thing on the list is Gold and it’s density is 19.3 kg/L

    10.  List something you learned from this activity.

            I learned how to figure out density when it isn't given. Also I was able to use the program and learn more about density and different objects. 

   4. Material: Ice
       Mass:4.60 kg
       Volume: 5.00 L
       Density: .92 kg/L

   Water level 104.60 L

  

            

   5.        One standard that would work well with this activity is the Science performance standard  C grade 4    
      C 4.2 use the science content being learned to ask questions  plan investigations, make observations, make predictions, and offer explanations.

      C 4.5 use data they have collected to develop explanations and answer questions generated by investigations. 

C 4.6 communicate the results of their investigations in ways their audiences will understand by using charts, graphs, drawings, written descriptions, and various other means, to display their answers.