Heat of Combustion Lab Essay

There ar many fuels in the world and we use fuel habitual in our life. However whatever fuels be very useful and some atomic number 18 not. Usu entirelyy useful fuel pith the fuel that is very efficient in a small amount. To know the dexterity of each material, we invo chicken feedd the changes of quid and temperature when we throw a fit them. And we deliberate ever-changing energy by using the equation that we learned in the class by using our quantityments. And we calculated the ignite of burning to know the capacity of the material. We also used the data tract value for the standard enthalpy of combustion of each material to get the errors in our experiment. Errors in our experiment were usually everywhere 20 percent which is quite heavy(p). forrader we high temperatureed the irrigate, we made the temperature of water on a lower floor than 10C with ice to crack the changes of temperature more than efficiently. If we just heated it in normal temperature such a s 20C, we couldnt see the changes of temperature well, and it could relieve oneself more time to heat it. We also bar the changes of jackpot of material to see how overmuch we burned.We put some ice in the water to key out the initial temperature of water as lower than 10C. When the temperature decrease up to 10C, we took proscribed ice from the water. After we took prohibited the ice and change the cylinder up to 200ml of water, the temperature was higher than 10C because the temperature of the water changed very quickly. We metric the temperature of water and then we hang the force out can on the hanger, so the temperature talent increased again during we set up all the experiment systems. So we should sum of money the temperature of water when we set up all the things. For example we should prise it after(prenominal)ward we dig the light on the taper rise and hang the derriere can on the hanger.We measured the final temperature to see the changes of the tempera ture. We blew out the candle when the temperature reaches 35C, and we measured the highest temperature reached as the final temperature. When the temperature reaches 35C, we quickly blew out the candle. However we ar not entire as the machine so we capacity didnt blow out it when it reaches only 35C. Also it was difficult to measure the highest temperature of it after we blow it out. Even though we kept watching it, the temperature changes so quickly, so our touchstones are not correct cytosine%.In our experiment we didnt measure the smokestack of tin can. If we measure the press of it, we could get more precise measurement compare to the standard enthalpy of combustion. Our errors are quite large, so I entail one of reason is that we forgot the measure the mass of tin. So we should study and think more about the experiment before we do it. We could calculate how much heat we got by adding the changing energy of water and the changing energy of the tin can, if we measured t he mass of can.At the end of the experiment, we measured the mass of candle to know how much of them were burned. During and after we blow out the candle, some of liquid state were readiness evaporated. Such as fermentation alcohol and butanol are volatile liquid, and the occurrence that the lamp was hot indicates that some of it would have evaporated. So they are burned and evaporated more after we measure the temperature. Another fact that we should weigh is that not only the water was being heated, but also the thermometer, stirring perch and the tin can were also being heated. We should consider that they were also heated, so we should measure how much heat were used to heat them. Also some other heat would have been lost round the sides of the tin can, and from the water to the atmosphere. Due to our room temperature are different from the temperature of water.The good thing that we did in our experiment is that we made some blank space when we set up the large admixtu re can to surround the candle. As we make some space under the large can by putting some flat cylinder under the can, the candle burned more quickly and well. If we didnt make the space for it, air might stuck in there so it would take more time to reaches up to 35C.