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Chemistry Classes Study Molecular Geometry and Gas Laws

posted May 14, 2013, 9:39 AM by sullivanp@serrahs.org
The chemistry classes at Serra Catholic have been busy exploring molecular geometry and gas laws through in-class activities.  In the molecular geometry lesson, students learned about the different shapes that molecules make when they are being bonded covalently.  The students built these models during in-class discussion of molecular geometry, to help support their understanding of covalent bonding through 3D models.

The students also conducted activities using popcorn and eggs to learn more about gas laws.  Using popcorn, the students were able to show Gay Lussac's Law, which states that when the temperature of a substance rises, the pressure also rises.  The students were able to demonstrate this by placing popcorn kernels in water and heating the water, which resulted in the kernels of popcorn popping open.

Students were also able to learn more about Gay Lussac's Law using the eggs.  The students placed a lit match inside a bottle and then placed an egg at the top of the bottle, lowering the amount of oxygen in the bottle.  Once the match extinguished due to a lack of oxygen, the temperature dropped in the bottle, which lowered the pressure level as well.  This meant that the atmospheric pressure was higher outside of the bottle than inside the bottle, resulting in the egg being pushed into the bottle.

Molecular Geometry Photos
                      

Gas Laws Photos

                          

                                    

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