They are both very soluble in alcohol and hexane so that doesn’t help, but in water ethyl ether is semi soluble and pentane is in soluble. This would make us lean toward pentane but we felt strongly that ethyl ether because of the density was a much better test because there is much less human error and the we asked about how do you decide if something is insoluble
(c) Air is made up of a mixture of gases, and is comprised of only 21% oxygen. The remaining gases would not be involved in the combustion process. On the contrary, the gases such as carbon dioxide may hinder the combustion process. Hence, if the bomb calorimeter were to be pressurised with air at 30 atm, it would result in an incomplete combustion of the fuel sample due to the lesser quantities of oxygen available. There would be a slower rate of combustion which leads to inefficient burning and less heat would be produced in the process.
These conditions are more suitable for ionic bonds. That is why the sucrose and salicylic acid did not have good results, because they have covalent bonds. There were a few sources of error that could be improved in the experiment. For example, when the substance was poured into the test tubes, some of the compound remained stuck to the weighing paper. If we used a stick resistant material for this step, the whole 1g would be accounted for.
If the temperature was less than the water bath in some places because only part of the pipet was immersed in the boiling water, the molar mass calculated would become lower. This is because the ideal gas law temperature value would be too low, therefore lowering the overall
The half reactions for this system are: Oxidation of 〖Fe〗^(2+): 〖Fe〗^(2+)→ 〖Fe〗^(3+)+1e^- Reduction of 〖MnO〗_4^-: 〖MnO〗_4^-+8H_3 O^++5e^-→ 〖Mn〗^(2+)+12H_2 O Which produces the following overall equation: 〖MnO〗_4^-+8H_3 O^++5〖Fe〗^(2+)→5〖Fe〗^(3+)+〖Mn〗^(2+)+12H_2 O Equilibrium is initially obtained at a very slow rate, therefore the titration is carried out in the presence of excess sulphuric acid (H_2 〖SO〗_4) at a high temperature; in order to drastically increase the rate at which equilibrium is attained. Potassium permanganate acts as its own satisfactory indicator since the reagent 〖MnO〗_4^- anion appears to be an intense purple colour while the product 〖Mn〗^(2+) cation has a colourless appearance. However, the end point must be read quickly as the permanganate end point gradually fades due to the 〖MnO〗_4^- reacting with the 〖Mn〗^(2+) that was formed during the titration. When performing the titration, one must be cautious as side reactions can occur and these side reactions must be prevented using appropriate chemical measures. If an insufficient amount of acid was
1. Does the ideal Gas Law do a reasonable job at predicting the behavior of the gas undergoing changes in temperature, pressure, and volume? Justify your answer with supporting evidence. Considering most gases don’t follow the ideal standards of the Ideal Gas Law, the law itself still provides reasonable calculations in predicting the behavior of gas. As long as we were able to identity two out of the three unknown variables, we could use the formula: PV=nRT to calculate the unknown value.
We thought that a pH level of 3 would be the optimal pH level for the enzyme catecholase and its substrate catechol to react in. There was no prior knowledge on the effect of pH levels on catecholase and catechol. The results of the experiment did not confirm this hypothesis; instead the hypothesis was rejected by the results of the experiment. The results showed that tube 1 had the slowest rate of reaction, and actually did not react at all. The results showed that tube 2 had the fastest rate of reaction; this tube was exposed to the neutral pH of 7.
It stops convection currents formed at the top of the flask thereby stopping convection. It also stops heat transfer by evaporation as the particles evaporating from the liquid surface cannot escape into the atmosphere (In case it is not a plastic cap, you have to skip the first point mentioned about conduction) • The glass surface inside reduces conduction as glass is a poor conductor. • Vacuum present between the walls of the container stop conduction and convection, as both these type of heat transfer need particles or a medium • Silver surfaces are good reflectors of heat energy. So they reflect the heat back into the hot liquid. This reduces the energy transfer by radiation.
Hydroelectric plants may be able to reshape water flows to more closely match daily and seasonal system energy demands. Hydroelectric plants have many advantages but even though they do sound perfect they still have some disadvantages. One of the main advantages of hydroelectric plants is since no fuel is burned there is minimal pollution. Today pollution is a main argument that is harming our environment. Pollution is causing the atmosphere to decay and is helping generate global warming.
Boyle scientifically varied the pressure and measured the volume of the gas. These measurements were performed using a fixed amount of gas and a constant temperature. In this way Boyle was able to examine the pressure-volume relationship without complications from other factors such as changes in temperature or amount of gas. Boyle’s law states that at constant temperature for a fixed mass, the absolute pressure and the volume of a gas are contrarily proportional. The law can also be stated in a slightly different manner, that the product of absolute pressure and volume is always constant.