Activity 5

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.

Lithium

Protons: 3

Neutrons: 4

Electrons: 3

Density: 0.535 g/cm^3

Boron

Protons: 5

Neutrons: 6

Electrons: 5

Density: 2.46 g/cm^3

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

Density: the amount of matter in a given amount of space

D=mass/volume

3. Run the Density simulation http://phet.colorado.edu/en/simulation/density and complete one(your choice) of the prepared Teacher-Submitted Activities under the Teacher Resources on the simulations page and post your results on your blog. The activity you choose should be one of the student intended activities.

I chose to complete the Sink or Float Activity under the Teacher-Submitted Activities section. 

Part 1

1.      What material/s that float/s in the water?

The wood, Styrofoam, and ice all float in the water.

2.      What material/s that sink/s in water?

The brick and aluminum both sink in the water.

3.      Give the density of each materials:

Ø  WOOD

-          .40 kg/L

Ø  ALUMINUM

-          2.70 kg/L

Ø  STYROFOAM

-          .15 kg/L

Ø  BRICK

-          2.0 kg/L

Ø  ICE

-          .92 kg/L

Part 2

1.      What is the relationship between mass and volume in relation of object’s density?

If the mass is less than the volume, the object will float because the density will be less than 1. If the mass is greater than the volume, the object will sink because the density will be greater than 1.

2.      What are the characteristics of those materials that sink in the water?

Every object that sunk had a greater mass than volume.

3.      Give your understanding about density of an object.

As the definition states, density relates to the amount of mass in a volume of space. The density will be greater if the mass is higher than the volume, and the density will be lower if the mass is less than the volume.

4.      Provide at least two scenarios that the concept of Density could apply.

-          Ships float because the hull of the ship is designed to displace water. Because it weighs less than the water it displaces, the ship will float.

-          Different types of wood have different densities, such as pine and oak. Oak is more dense than pine. The fibers are packed tighter in oak than they are in pine. So if you have an oak table and a pine table of the same size, the oak table will be denser. 

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.

Block A:

Mass- 65.14 kg

Volume- 3.38 L

Density- 19.27 kg/L

Material- Gold (known density: 19.3 kg/L)

Block B:

Mass-  0.64 kg

Volume- 0.64 kg

Density- 1 kg/L

Material- Water (known density: 1 kg/L)

Block C:

Mass- 4.08 kg

Volume- 4.08 L

Density- 1 kg/L

Material- Water (known density: 1 kg/L)

Block D:

Mass- 3.10 kg 

Volume- 3.10 L

Density- 1 kg/L

Material- Water (known density: 1 kg/L)

Block E:

Mass- 3.53 kg

Volume- 1 L

Density- 3.53 kg/L

Material- Diamond (known density: 3.53 kg/L)

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

B.4.1 Use encyclopedias, source books, texts, computers, teachers, parents, other adults, journals, popular press, and various other sources, to help answer science-related questions and plan 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 

A.4.3 When investigating a science-related problem, decide what data can be collected to determine the most useful explanations