Discussion: 1. The Diels alder reaction has to be heated slowly to 60-70 degrees Celsius because if it is heated too quickly and the temperature gets too high the 2,3-dimethyl-1,3-butadiene will boil. A round bottom flask was attached to a water condenser to prevent any product from boiling and evaporating out during the heating process. For the hydrolysis part of the experiment the temperature needed to be 60-80 degrees Celsius to melt the cyclic anhydride but also prevent the reaction from boiling and losing product from evaporation. Lastly the final product crystals were not washed with hot water because it would have melted the crystal thus cold water was used.
When we tested methanol, triphenylmethan did not dissolve at room temperature, but did dissove when the methanol was hot, and then recrystalized into a solid when the mehtanol was cooled, so this was a suitable solvent. When we tested toluene, triphenylmethan dissolved right away at room temperature and was therefore determined to be not suitable for recrystalization. Had we been required to find a solvent for trimyristin, we would have undergone the same tests with various potential solvents for it. Extraction is the transfer of a solute from one phase to another. Adding a solvent to a solid that only dissolves certain compounds in the
The substitution reaction was successful but not fully effective. 19. If the data was inconclusive, then comparing various compounds and the unknown based on physical characteristics would be the first step, titrations would also be a good method. 20. To get a better yield, redoing the experiment would require careful attention in the recrystallization steps: amount of solvent used, how hot solvent is, if the mixture cools to room temperature before placing it in an ice
This ensures that only the compound with the lower boiling point is completely condensed before the compound with the higher boiling point begins to condense. Therefore, this means that the 2-propanol has condensed completely before 1-butanol had begun to, allowing the individual boiling points to be clearly analysed. As well the product can be pure 2-propanol if the temperature is decreased before the 1-butanol begins to condense. Compared to the simple distillation, it would be difficult to identify when the two compounds would be separated from the ever-increasing temperature. In addition, if one was intending to separate compounds with close boiling points, fractional distillation would better the better distillation
In this condition the participant could enter into Hypothermia. Hypothermia is caused by exposure to low temperatures, the body starts losing heat more quickly than it can produce it resulting in the body temperature going down rapidly. The body can not replace the heat as it 's being lost to the environment, the severity depends on how low the body temperature drops. If the body drops below 35 degrees Celsius it is mild hypothermia, the body starts to shiver and vasoconstriction starts to reduce blood flow extremely. If the body then drops below 31 degrees Celsius it is Moderate hypothermia.
“It’s impractical to produce high purity yield.” () Physical and Chemical Properties Cyclohexane is a highly flammable liquid. It is colorless, mobile, water-insoluble, non-corrosive, easily vaporized and less toxic than benzene. Structurally it is a cycloparaffin and more times than not is in the Chair
However, it dissolved in non-polar solvent toluene and slightly in ethanol, which means naphthalene is non-polar. It has high resistivity in aqueous solution and solid form, and respective melting point. The sample was given as solid with large shiny white crystals. Silicon carbide was classified in this experiment as macromolecular structure. This compound was insoluble at any type of solvent both polar and non-polar.
Enzymes are proteins that catalyze chemical reaction, and they work best at their optimal conditions (optimum pH, temperature etc.) but when the environment is not close to the optimum conditions, the enzymes denature and do not function anymore1. An excellent example would of the effect of temperature on yeast fermentation would be that the bacterial cells if exposed to very high temperature (above the optimal) would no longer function since their enzymes are denatured. The yeast would produce the most Carbon dioxide in the optimal temperature (45 °C ±1/°C) and other temperatures below the optimal temperature would not produce sufficient Carbon dioxide and any temperature above will produce too much that it will lead to the sinking of the bread and death of yeast because its enzymes have been denatured, therefore the reaction will stop. The bread will certainly sink if is not exposed to the right temperature the yeast will not ferment
This occurs because the sample vaporized into the gas phase and is placed into a capillary under controlled temperature and pressure. As the mobile phase and is placed into the capillary under controlled temperature and pressure. As the mobile phase is flowed through the capillary, more volatile compounds should elute first. Accordingly, the alcohol should elute last, preceded by the alkyl halide. For example, in part A the 1-chlorobutane eluted first because it has a lower boiling point of 78°C compare to the boiling point of 1-bromobutane of 101.4 to 102.9°C.
These metals have only one electron in their outer shell. This means they are ready to lose that one electron in ionic bonding with other elements. As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. The alkali metals are softer than most other metals. Cesium and francium are the most reactive elements in this group.