Activity 5
Neutral Lithium Atom
3 protons, 3 neutrons, 3 electrons
Neutral Boron Atom
5 protons, 5 neutrons, 5 electrons
Density
Lithium atom: 0.534 g/cm3
Boron atom: 2.08 g/cm3
Density can be defined as the compactness or denseness of something. More scientifically, it is mass per unit volume. The equation for density is D=m/v.
3.
PhET- Density
Activity- Funsheet
Custom Section Name__Logan____
|
Material
|
Mass (kg)
|
Volume (L)
|
Density (kg/L)
|
Does it Float?
|
|
Styrofoam
|
0.75
|
5
|
0.15
|
yes
|
|
Wood
|
2
|
5
|
0.40
|
yes
|
|
Ice
|
4.60
|
5
|
0.92
|
Yes
|
|
Brick
|
10
|
5
|
2
|
no
|
|
Aluminum
|
13.50
|
5
|
2.70
|
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 L___________ Density____1.00 kg/L_________
2.
How does the density of a large piece of aluminum
compare to a small piece?
The density stays the
same because the volume of the cube stays consistent with the mass of the cube.
If the mass is raised, so is the volume.
Same Mass Section
|
Material
|
Mass (kg)
|
Volume (L)
|
Density (kg/L)
|
Does it Float?
|
|
Blue
|
5
|
5
|
1
|
yes
|
|
Yellow
|
5
|
10
|
0.5
|
yes
|
|
Green
|
5
|
2.5
|
2
|
no
|
|
Red
|
5
|
1.25
|
4
|
no
|
Same Volume Section
|
Material
|
Mass (kg)
|
Volume (L)
|
Density (kg/L)
|
Does it Float?
|
|
Blue
|
6
|
5
|
1.2
|
no
|
|
Yellow
|
8
|
5
|
1.6
|
no
|
|
Green
|
4
|
5
|
0.8
|
yes
|
|
Red
|
2
|
5
|
0.4
|
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 density must be
below or equal to 1 kg/L in order to float.
Same Density Section:
4. Calculate the
density of the blue object in this section.
Mass ____3 kg___ Volume____3.75 L___ Density__1.25 kg/L___
5. Explain why both
the yellow and red objects float when they have different sizes.
The bigger object has
a bigger volume which allows it to float while the smaller object has a smaller
volume as well.
Mystery Section:
6. Before you start,
pick an object that you think will float.
_____B________
Pick an object
that you think will sink. _____A_______
|
Material
|
Mass (kg)
|
Volume (L)
|
Density (kg/L)
|
Does it Float?
|
|
A
|
65.14
|
3.38
|
19.3
|
no
|
|
B
|
0.64
|
1
|
0.64
|
yes
|
|
C
|
4.08
|
5.83
|
0.70
|
yes
|
|
D
|
3.10
|
3.38
|
0.92
|
yes
|
|
E
|
3.53
|
1
|
3.53
|
no
|
7. In the Custom
section describe the difference between how Styrofoam and ice
floated. Also explain why you think this is the case?
Ice floated slow and
sat below the water more while Styrofoam shot out of the water and was barely
submerged. Styrofoam is a lot closer to 0 than ice so it has a tendency to not
allow itself to float.
8. In the Same Mass
Section discuss what was interesting about the blue object’s behavior in the
water.
It would float
wherever you dragged it to. This is because the density is 1 kg/L which means
it has the same density as water. It can float on the surface, on the bottom,
or in between.
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.
Gold – 19.3 kg/L
10. List something
you learned from this activity.
I learned that
diamond is less dense than gold. Diamond must contain elements that don’t
weight as much while gold has a lot more mass.
4. Mystery Section:
|
Material
|
Mass (kg)
|
Volume (L)
|
Density (kg/L)
|
Material
|
|
A
|
65.14
|
3.38
|
19.3
|
gold
|
|
B
|
0.64
|
1
|
0.64
|
apple
|
|
C
|
4.08
|
5.83
|
0.70
|
gasoline
|
|
D
|
3.10
|
3.38
|
0.92
|
ice |
|
E
|
3.53
|
1
|
3.53
| diamond |
5. Science Standards completed
- A.4.2 When faced with a science-related problem, decide what evidence, models, or explanations previously studied can be used to better understand what is happening now
- A.4.3 When faced with a science-related problem, decide what data can be collected to determine the most useful explanation
- C.4.3 Use 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.4.7 Support their conclusions with logical arguments
- C.4.8 Ask additional questions that might help focus or further an investigation
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