Blog Week 15

On Monday, we went over the assessments and I didn't do as bad as I though I got mostly threes and fours. We went over that phase energy has no temperature change and solid to liquid and liquid to gas are phase energies. Also that phase energy is also mΔHvap and mΔHfus Thermal energy has a temperature change and the equation is mcΔT=Q. On Tuesday, we started our soap project and I was in a group with Shannon, Mariah and Carly. We started by melting the soap base and when it was melted all the way we added in the scent and the food coloring we wanted. We then poured the melted soap into the molds. We left the molds for a day. On Wednesday, we took the soap out of the molds. We then wrapped the soap up in whatever we could find, to take them home. My group then discussed what we would do for our Evernote project, I did the product and the development part. On Thursday, we presented our Evernote project. I think it went well. We each did our part on google doc and I transferred all the work into Evernote. I thought the rest of the groups did a great job as well. I thought all the soaps turned out really well and the winners of the best soaps deserved it. On Friday, we did an ICS lab, which stands for ice cream social. This lab was suppose to show us a phase change water that was solid and we added salt. Salt will get in between the water particles and they will interrupt the attractions and it will melt the ice. For the LOL diagram Eth was 1  and Eph was 1; after Eth was barely 1 and Eph was 2. We learned that the freezing point depression is how you melt ice on driveways. We were trying to make ice/water to be below zero to freeze cream and make ice cream. We shook our bag for ten minutes and the ingredients in our bag mixed together and didn't turn into a complete solid. when we finally finished shaking our bag we got a vanilla milkshake. Mariah tried a little of it, but I didn't have time to try it. I hope it was good!

Blog Week 14

I was absent Monday, Tuesday and Wednesday this week. I reviewed the notes that were done in class and gathered some information. Mathematics of state changes △Hfus, the energy of melting and freezing and △Hvap, the energy of evaporating and condensing and boiling. I also learned what field is, it's the area around an object where a non-contacting force can be exerted. Energy can be stored in fields, electrostatic field are particle in chemistry. Eph is the energy stored in the "field" between particles. Eth is the movement of those particles. I learned that specific heat is the energy associated with one Celsius change in temperature for one gram of a substance. On Thursday, I was in class and we learned about heat of vaporization and fusion. Heat of vaporization, △Hvap, is liquid to gas and gas to liquid. The equation to find the amount of energy for heat of vaporization is Qvap=m△Hvap. It takes 2260J per gram for water. Heat of fusion, △Hfus, is solid to liquid and liquid to solid. The equation is Q=m△Hfus. It takes 334J per gram for water. Both heat of vaporization and fusion are part of phase energy. The thermal energy equation is Q=mc△T. On Friday, we took an assessment and it was pretty hard. I didn't know how to explain most of the questions and I was not prepared well enough. So, I will definitely be reassessing. 

Blog Week 13

On Monday, we talked about the assessment, we took on Friday. I got all most all of the questions right. On the first one I got the main idea, but forgot to talk about energy. The second question, I did wrong, I did not set the equation up right. It was suppose to be 2500=m(4.18)(70), the 70 came from 100-30, 100 is the temperature of boiling water and the water dropped 30 degrees Celsius. So, the answer came to m=8.54kg. The third question we were suppose to talk about both mass and temperature and use the equation Q=m△T. So I pulled in the first mass and temperature in: 25(100)=2500, then I did the second mass and temperature and got 50(50)=2500. They have the same amount of energy. On Tuesday, we learned about boiling and the bubbles that are formed. Boiling is gas diffusion, particles move faster and spread out, and then more energy is added. The bubbles are particles of water, just further apart from each other and the volume is expanded and the density decreased, which makes it them float. As the one bubbles state changes the others start to join. The types of state changes are condensation, ice melting and steam. The mathematics of state changes are Eph→ Q=mc△T, then Eph→△Hrus→Eph of melting or freezing, Eph→△Hvap→ condensation or evaporating. This picture below, shows the different state changes of water. 

On Wednesday, we had a shortened class. We learned that particle diagrams don't do a good job of representing the changes in energy. So we learned energy accounting. We recorded Thermal→Eth before and after and Phase→Eph before and after. Then we record which is bigger on a bar graphs before and after and if energy came into the system of left the system. This picture blow shows some examples. (sorry I don't know how to turn it around.) Eth, thermal energy is the motion or speed of particles. Eph, phase energy is the state of matter change, the arrangement or distance between particles. 


On Thursday, I was absent.
On Friday, I was also absent.