Physical Properties Of A Compound

No correction had to be made to the melting points because the standard melted in the range labeled on the bottle. The melted point observed is the correct melting point.

Discussion The third experiment of the semester involves identifying an unknown component of Panacetin, a common pain relief medication, separated and precipitated in the previous experiment. Although Panacetin’s label reports this third ingredient as Tylenol, there is controversy over the true classification of the third substance. This Panacetin label also reports that the unknown constituent makes up 50% of the composition of Panacetin, compared to aspirin’s 40% composition and sucrose’s 10% composition, meaning that it is currently unknown what half of the drug people ingest is identified as. Research results have failed to repeatedly show that the third component of Panacetin is Tylenol, which leads to the hypothesis

After each of the solids were completely dry, each was placed into a MelTemp device. The temperature at which each solid began to melt and completed melting was recorded.

We packed the powdered alum into a capillary then dropped it onto the lab table to make it move to the bottom. My group then strapped the tube onto a thermometer using a rubber band. Next, we clamped the thermometer with the capillary tube onto a ring stand with a rubber stopper. We dipped the thermometer and tube into a Thiele melting point tube that held silicon oil inside of it. My group heated the tube with a bunsen burner and waited for the powdered alum to melt from the capillary tube. We recorded the temperature at which the alum disappeared from the tube to get our melting point. This whole process was repeated to find a more accurate melting point than the first

Discussion: As seen in the melting point determination, the average melting point range of the product was 172.2-185.3ºC. The melting points of the possible products are listed as 101ºC for o-methoxybenzoic acid, 110ºC for m- methoxybenzoic acid, and 185ºC for p- methoxybenzoic acid. As the melting point of the sample

Melting range would be closely related to a mixed sample whose constituents are most identical. In other words, melting point will have a wide range and would be below 200°C and above 95°C.

In order to discover the melting point range of Unknown 33A, a Digimelt was utilized. Melting point is the temperature at which a crystalline structure changes from solid to liquid. By adding thermal energy, the structure changed from solid to liquid. The thermal energy increased the kinetic energy, which then overcame the intermolecular attractive forces between the molecules. This increase in speed allowed the molecules to move more freely. By identifying the melting point range of Unknown 33A, it narrowed the possibilities of the unknown by ruling out the compounds with melting points greater than ± 20°C from Unknown 33A’s melting point range.

What is the effect of an insoluble impurity, such as sodium sulfate, on the observed melting point of a compound? It is apparent that the impurity must be soluble in the compound, so insoluble impurity will not depress the

Procedure: This lab starts off by making sure the logger pro and temperature probe are in proper condition. Then, the data collection must be adjusted to 15 minutes and 12 samples/ min. After that a Bunsen burner must be set up by assembling a ring-stand, ring, and wire gauze, and a crack-less beaker is used to boil some water. First the beaker and the large watch glass need to be weighed and the mass has to be recorded using a triple beam balance. Next, the beaker with 200g of ice is placed on the ring stand, and immediately heated over medium flame. An important note is to make sure the flame is perfectly adjusted so the ice does not melt on the counter while trying to adjust the flame. Furthermore, place the temperature probe in the ice so it is not resting at the bottom of the beaker, it is best to secure it with a small clamp. Additionally, click the green start button on the computer and stir continuously with a glass rod until the ice is completely melted. Once the ice has melted which is somewhere between 3-5 minutes, the stirring rate will slow

Quote: “I look back sometimes at the person I was before I rediscovered my old professor. I want to talk to that person. I want to tell him what to look out for, what mistakes to avoid. I want to tell him to be more open, to ignore the lure of advertised values, to pay attention when your loved ones are speaking, as if it were the last time you might hear them.” (190)

Short Story Analysis Essay of “The Devil and Tom Walker” The short story “The Devil and Tom Walker” by Washington Irving takes place in 1727 in Boston, Massachusetts. As the short story precedes, Irving shows how the main character Tom Walker experiences a world full of conflicts and decisions that result from his greed, actions, and corruption. With these conflicts and decisions, his fate is decided when he encounters the devil who offers Tom wealth in exchange for his soul. Due to his miserable life and a second chance, Tom Walker accepts the deal which ends up leading to his downfall.

Today in British society, class systems are still as prevalent as they were in the 19th century, there are seven social classes, ranging from the elite at the top to the extreme poor at the bottom. Typically in English society social class was always defined by occupation, wealth, and education with an addiction of social and cultural classes added. Social classes is a prevalent aspect of British society since before recorded history, it was the addition of money, land and title that increased the division of the classes. As the industrial revolution swung into full force, the division of classes strengthened. Social mobility became a common occurrence as society developed and moved forward towards the twentieth century. This holds true in the novel Hard Times, written by Charles Dickens in the Nineteenth century, examines the British class system through examples of social relationships and the labor force. (4)

In determining the melting point range of the aspirin, a capillary tube (sealed at one end) was one-third-filled with the dried aspirin. The capillary tube and a thermometer were immersed in an oil bath. The temperature at which the solid started to melt and the temperature when the entire sample was completely liquefied were recorded as the melting point temperature range.

I was instructed to record a melting point range for each compound, rather than a single temperature melting point. The reason for this instruction is that polymers and unpure substance melt over a range of several degrees. Based on the melting point ranges for both substances, it is difficult to differentiate the two based on its melting point data alone. The ranges of the substances are close enough to one another that one could argue for experimental error when presenting the data as a solo identifying property.

Brittain, C. G. (2009). Using Melting Point to Determine Purity of Crystalline Solids. Retrieved from http://www.chm.uri.edu/mmcgregor/chm228/use_of_melting_point_apparatus.pdf