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 atom:
protons: 3
neutrons: 3
electrons: 3
density: 0.53 g/cm3

Boron atom:
protons: 5
neutrons: 6
electrons: 5
density: 2.34 g/cm3

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

The definition of density is: mass per unit volume; the state or quality of being dense; compactness; closely set or crowded condition.
Equation: Density= Mass/ volume

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.

Name: ___­­­­­­­­­__________________________
Class Period: _____________________________

Floating and Sinking:
Pre Lab Questions:

You have a block, and you see that it floats in water.

               What could it be made of?
   1. Plasic
   2. Wood
   3. Styrofoam
   4. Ice

What do you think will happen if you make a bigger block out of the same material?  Will it float or sink?

   I believe it will still float.

You have another block that sinks.

          What could it be made of?

   1. Brick
   2. Rock
   3. Cement
   4. Glass

           What do you think will happen if you make a smaller block out of the same material?  Will it       float or sink?





   I think it will sink.

             Why do you think Block #1 floats and Block #2 sinks?

   Block #1 float’s because there is less density than block #2. The materials are lighter and hollow.    Block #2 are composed of heavy materials that are solid all the way through causing them to sink immediately.

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

Block B:
mass- 0.64 kg
volume- 1.00 l
density- 0.64 kg/l

Block C:
mass- 4.08 kg
volume- 5.83 l
density- 0.69 kg/l

Block D:
mass- 3.10 kg
volume- 3.38 l
density- 0.92 kg/l

Block E:
mass- 3.53 kg
volume- 1.00 l
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

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
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.4.2 Use the science content being learned to ask questions, plan investigations, make observations, make predictions, and offer explanations
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
D.4.2 Group and/or classify objects and substances based on the properties of earth materials