pHet Lab

Record your lab in "Pages" on your iPad.

Go to the "Density" pHet lab by clicking on this link: http://phet.colorado.edu/en/simulation/density

1. Keep the right hand "Blocks" box on "Custom"
2. Keep the left hand box clicked on "Material".  Do not adjust the sliders for now.
3. Create a data table (in Pages) to record the objects' (styrofoam, wood, ice, brick, aluminum) mass, volume, density and observations (does it float or sink).
4. Which block is closest to the density of water?  How do you know this?  (answer in Pages)
5. Next, change the left corner box from "Material" to "My Block".  Create a block that is closest to the density of water.  Record it's mass, volume, density and observations in your data table.
6. Click on "Same Mass" in the right hand box.  Notice that you have four blocks of different sizes, but the same mass.  Create a new data table having a space for each block, whether your predict it will float or sink, and whether it does float or sink.  Next, drop each block into the water.
7.  Each block has the same mass.  Why did some float and some sink?  Why did they sink at different rates?  (Observe again, if necessary)  Answer in Pages.
8.  Click on "Same Volume" in the right hand box.  Create a data table for each block and your prediction of whether it will float or sink and your observation of what happens.  Drop each block into the water.
9.  Describe your results.  Each block is the same size, why did blocks sink and float?  Why did some float higher?
10. Create a new data table recording each block, your prediction of what will happen after being dropped in the water, and what does happen after being dropped in the water for blocks with the "Same Density".
11.  Describe why this happens.

12.  Go to the following link:
http://phet.colorado.edu/en/simulation/states-of-matter
13. Create a data table to observe neon and water as a solid, liquid and gas.
14. Describe the movement of molecules in each phase.  BE SPECIFIC.
15. How does solid water differ from solid neon?
16. Start at a solid and add and remove heat to observe phase changes.  What affect does adding and removing heat have on the molecule behavior?

17. Finally, answer the following prompt:
-----Describe one of the processes that could be used to separate a mixture of iron fillings, wood shavings and salt.  Be sure to include all steps.