This melting point data confirms that isomerization occurred, since the melting point of dimethyl maleate is only -17℃, while the melting point of dimethyl fumarate is 102-105℃. This also highlights the fact that diastereomers have different chemical properties, such as melting point. Since the experimental melting point range almost overlaps with the expected range, there is little error in this measurement. The small amount of error could have occurred from the MelTemp temperature rising too quickly, leading to errors when reading the
12. The TLC data obtained is provided in a table below. The TLC data was conducted solely in a 9:1 hexane/ethyl acetate solvent solution as opposed to the 1:1 and pure hexane solution as well. This was due to the lack of time, but as explained in number 7, a very polar solvent (1:1 solution) or non-polar solvent (pure hexane) is not ideal when obtaining
Is MCT Oil Bad For You? No. MCT oil is not bad for you; however, with the lauric acid removed from its content, it 's not better for you than coconut oil, it 's just different. You may also see the term "liquid coconut oil" being thrown around. Coconut oil in its true form is a solid at room temperature.
Rf is equal to the distance traveled by the substance divided by the distance traveled by the solvent. Since the solvent used in the developing chamber was hexanes—a non-polar molecule— the more nonpolar the substance was, the stronger it would stick to the plate. This means that the more polar a pigment was, the higher it climbed on the TLC plate and would therefore have a larger Rf. There are 3 major classes of pigments present in spinach: carotenes, xanthophylls, and chlorophylls. Since the solvent is nonpolar, we would expect carotene to have the lowest Rf, then xanthophylls, and chlorophylls would have the highest.
Another chemical, Hydrofluorocarbons (HFCs), having no chlorine atoms which does not bring harm to the ozone layer is considered the best alternative since they are not flammable, such as CF3CH2F,1,1,12 tetrafluoroethane. As CFCs are replaced by HFCs, the remaining CFCS will reduce as the ozone recovers
The melting point of the experimentally synthesized Aspirin product was found to be between 126-129 ˚C. This temperature range of initial to final melting point has a small and sharp temperature range of only 3˚C, which is within the acceptable limits of the 128-137˚C1 literature value for Aspirin (Acetylsalicylic Acid/2-acetoxybenzoic acid), if located slightly toward the beginning of the literature melting temperature range. Therefore, the narrow melting point range, which falls within the standard literature value range results, indicate the reliability purity of the sample. Had the melting point been higher than the literature value, but maintained a sharp melting point range, the compound could have still indicated a pure sample. A lower
The fastest pH was 6 (total:34.5), and it seems that there wasn’t a large change which resulted in a stable structure. The temperature in our experiment was not very high which didn’t result in denaturation of peroxidase. The temperature seemed to be a constant that didn’t affect the experiment. If the temperature was higher in pH 3 and low in pH 10, then it would cause pH 3 to denature even more which would make the pH 3 total about 4.0. Substrate concentration basically means the amount used for the substrate.
We tried to minimize the effect of the heat loss by using chilled water instead of room temperature, although not much correction was done. Also, incomplete combustion (carbon monoxide and carbon are made instead of carbon dioxide) was a severe hindrance to the lab. The lack of lab resources and a changing environment were the main limitations to finding accurate values during the combustion
and when you add impurities you have free electrons or holes that make it a (poor) conductor. It prevents radiation, because it prevents electromagnetic waves, it also prevents conduction, because it doesn’t conduct heat, so it cannot transfer heat to objects. It prevents convection, because the atoms cannot move through the water in the object. My third material, yarn, is a good insulator, because it doesn’t conduct heat, because the valence electrons are 4 and so join with other molecules to make strong bonds. and when you add impurities you have free electrons or holes that make it a (poor) conductor.
In electrolysis, current flows through a molten ionic compound or an ionic solution because both of them contain free mobile ions that can move around and gain or loose electrons. Covalent compounds can not be used in electrolysis because they contain molecules which are neutral (while ions are charged) hence they can not be discharched at the electrodes as they don’t gain or lose electrons at the electrons due to their neutral charge. For electrolysis: a current source, electrodes and an electrolyte is needed. Electrodes are the conductors of electricity that are in contact with the non-metallic part of the circuit (which in this case is the solution) (Bylikin & Horner, 2014). There are two types of electrodes: anode and cathode which are positively and negatively charged respectively.