Chem Blog Week 7

In chemistry this week, I learned about expansion, contraction, and the relationship between pressure, volume, temperature, and the number of particles. On Monday, We talked about the ethanol and water experiment.Both were heated with the burner for the same amount of time and given energy through the process of heating–and why the ethanol in the tube rose while the water didn't as much. This is due to  expansion. Expansion is when a liquid takes up more volume as its volume is increased by more energy input through heating. Therefore, expansion occurred in the ethanol while heating occurred. The heating caused the particles to spread out over a longer distance, therefore, causing the ethanol level to increase.Throughout the week, we learned the opposite of expansion–contraction. Contraction is where the volume of a liquid is going down as a result of it cooling down. As the liquid cools down, the particles get closer and closer together. They don't spread out. Therefore, the volume goes down as the particles become more densely packed from cooling.The connection between expansion and contraction is how they affect the overall density as well as volume of a liquid. Through expansion, the volume increases, meaning that the density is going to decrease since the number of particles and mass remain the same with increasing volume. As for contraction, the volume increases. Therefore, the density will increase since the number of particles and mass remain unchanged with a decreasing volume. Therefore, expansion andcontraction affect not only the volumeof a liquid, but also its density. Pressure is the physical force exerted from one object onto another object, which can be represented by the formula: pressure=force/given area. In this case, the air particles exerted their physical force onto the water particles.Pressure, though, is affected based on the force exerted onto the area, which means that the greater the area or volume, the less the pressure. If the area were less, though, then the pressure would be greater. Pressure is affected because the greater the area is, the greater the resistance to apply pressure is. Therefore, the pressure is less than if there were a lesser area that pressure would exert with less resistance. This also applies to the experiment Mr. Abud showed us. He brought out a latex glove and the device that resembled a bed of nails. He first placed the baloon on the bed with rows of nails and when he pressed down the glove did not pop, however when there was only one nail and the glove was placed it popped quickly because the area that the force applied to was not as large a before therefore the amount of pressure was increased at that spot making the glove pop. Throughout the week, the focus was on pressure, volume, temperature, and the number of particles. In class Mr. Abud gave us 4 different types of experiments our group was given the challenge to find the relationship between pressure and temperature. What our group found was that the relationship between temperature and pressure is that since increasing temperature would increase the volume, then the pressure would decrease. Therefore, the more the temperature is, the less the pressure is.The relationship between volume and temperature was a direct one. The greater the temperature was, the greater the volume. The reason for this is because the greater the temperature, the greater the energy input through the process of heating. This would cause the particles in a liquid to separate farther from each other, thus increasing the volume.The relationship between the number of particles and pressure was direct. Thus, the greater the number of particles is, the greater the pressure is. However, temperature doesn't influence the number of particles because temperature doesn't determine the number of particles and the number of particles determines the temperature. Although I missed two days this past week I was able to catch up thanks to the #ChemT3am!