Blog Week 7

This week in chemistry we learned about temperature and pressure and their affects on the particles. On Monday we went over the experiment. The one that had two test tubes one was filled with water and the other was filled with ethanol. They had the same mass, which also means the same amount of particles and we that heated them both to the same temperature The water was more dense so the particles were closer together. We found out that the ethanol rose faster and it's volume increased and the density decreased. Ethanol takes less energy than water, so water takes longer for the particles to spread. We then went on to talk about how the ethanol was a model of a thermometer. Then we talked about what temperature really is, it's a measure of the energy of particles. The energy or velocity is the speed of the particles or motion. The average velocity or energy of all the particles is the temperature. The person who made the thermometer that measures temperature was Anders Celsius. Next we went over pressure. We learned that pressure is a force in a certain area. The more surface area the less pressure. On Tuesday, I was not at school, but I did look up how straws work. How do straws work? "The atmospheric pressure is pushing the liquid up the straw. When you suck the air out of the straw, you decrease the pressure inside the straw, allowing the higher pressure on the rest of the surface to push the liquid up the straw and into your mouth."(http://indianapublicmedia.org/amomentofscience/drinking-straws-work/) This means that when you suck the air out of the straw pressure is decreased, so the liquid is not held down it can flow through the straw and into your mouth. I was absent on Wednesday and I understand that we did a lab on gases, but       I'm not sure what it was on. On Thursday, we learned that the more spread out the particles are at the beginning thee less energy is needed to expand its volume. We then learned the equation for pressure it's k(1/v). The factors that might affect gas pressure are the number of particles and the volume of the gas. The temperature will stay the same when the volume and pressure are related. Another equation for pressure is t(1/v). On Friday, we did a group project, answered the standards. My group worked hard and we understood most of the standards, but we work on some of the others. I'm sorry I could not get to five hundred words, I wasn't sure what to write for Tuesday and Wednesday. I hope my not making it to five hundred words doesn't mark me down.