SG/ Chem Blog FINAL

Over the last week and a half, we have done multiple things in sustainable green chemistry. The first this we did was a lab about heating curves, we also worked on formal lab reports on out PTVn labs about pressure temperature and volume. Then we learned about how to calculate the amount of energy used to raise the temperature of a substance by one degree Celsius.

Heating Curves:
In this experiment, we wanted to find how the temperature of water increased as we applied heat to it, what we found may surprise you. We found that as the water was heated, there were periods of time when the temperature would simply flat line, we realized that this was because the phase was changing.

*Example of a heating curve*

The temperature flat lined when changing phases because it takes a lot of energy to break molecules apart or to bring them together, so instead of raising the temperature all of the energy it being used in this case to go from ice to water, and from water to water vapor. To do this lab, we hooked a thermometer up to a mac and connected it to logger pro. Since Logger pro automatically plots the data, we only had to set up the table and then put the thermometer into a cup of ice water and turn on the heater.

Lab Report:

In class and at home, we have been working on formal lab reports for one of our biggest and most interesting labs. While I talked about the lab itself in a past blog I have not gotten a chance to write about the lab report. In the lab report I wrote about what I expected to see, what I did see and how the two compared. I also analyzed the data and thought of a couple scenarios that would have caused my data to be incorrect.

Calculating Energy:

 At first, I had trouble doing this, but then I realized that I was only having trouble because I was failing to do algebra. I spent a lot of time just racking my brain and I couldn't figure it out until I remembered all of the stuff I learned in algebra 1 ac. It also helped that my some classmates were understanding It so I could go to them for guidance.

Conclusion:

Over all, I had a great time this week and in all of SG/Chem. As the title said, this will be my last blog for a while and I have hoped you enjoyed it.

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.