SG/Chem Blog 7

Over the last week we have done quite a few different things. One of the things we did was reviewing for the Unit 2 test on Monday. We also learned about PTVn tables, and began to prepare for writing a lab report about out PTVn labs.

Unit 2 Review:

To prepare for our unit 2 test, we created whiteboards that showed everything that we have learned.We did something very similar to this before our first test and I think that it was very effective.

*Examples of review boards*

During Unit 2, we learned about the relationships between pressure, temperature, volume,and the number of molecules. Pressure has a positive relationship with temperature, when the temperature increases, so does the pressure. This is because when gas increases in temperature, the molecules move at a faster speed and then hit the container more. Pressure has a negative relationship with volume, as the volume increases the pressure decrease, but the pressure will never reach zero. This is because pressure is created when molecules collide with the container they are inside, and no matter how large the container is, a particle will eventually collide with the outside creating pressure. Finally, pressure has a positive relationship with the number as particles, as the number of particles increases the amount of pressure increases. This is because as the amount of particles increases, more particles can collide with the container at a faster rate, therefore there is more pressure.

We also learned about the origins of Celsius and how it relates to Kelvin. Celsius was created by Anders Celsius, he filled a small vial with mercury and place the mercury in a pool of freezing water, he then took that measurement as 0 degrees Celsius. Then he place it in boiling water, he observed as the mercury expanded to fill up the vial, he then marked the top of the mercury as 100 degrees Celsius. That is the story of Celsius and also of the heat meter or, more commonly the thermometer.

We also learned about PTVn tables, they are simple tables that act as graphic organizers to help solve problems that use relationships between Pressure Temperature, Mass and Volume. I found these tables really useful. 

*an example of a PTVn table*

The table has the initial, and final values. It also shows how the changes effect the value you are trying to calculate. They help by providing a graphic organizer and visualizing causes and effects.

That is what we have done over the last week. I really enjoyed the last week of SG/Chem and feel like I learned lot.