The identification of the melting point of the organic acid was done to find another characteristic of the acid and to test the purity of the recrystallized pure acid. A 2-4 mm layer of unknown sample was placed into a capillary tube sealed on one end. Then the capillary tube was inserted into the side a Bibby Sterlin device. The plateau was set to 200°C on the melting point apparatus. Once the plateau temperature was reached, the sample was watched carefully. When the sample first began to melt and when it was fully melted was recorded. These numbers were the range of the melting point. A slow melting point of the unknown organic acid and a standard sample was completed next. A new plateau was set about 10°C lower than the observed melting point of the unknown sample. This time once the plateau was reached, the heating was no more than 1°C per minute. This gave a much more accurate read of both melting points. If the standard did not melt in the range listed on the label of the bottle, that meant the machine was not working properly. The standard sample and the unknown organic acid melted in their appropriate ranges.…
The purpose of this experiment was to determine the differential rate law for a chemical reaction based on the relationship between the concentration of reactants and the rate of reaction. Since spectrophotometers, like Spec-20s, provide information about concentration, these instruments were used to monitor the increase or decrease in concentration of a reactant in a solution over time. By plotting [phph2-] versus time and changing the concentration of OH- used, the order of the reaction with respect to each reactant and the overall order of the reaction can be determined.…
2. To determine the densities of water, an unknown liquid, a rubber stopper, and an unknown rectangular solid.…
The objective of the experiment was to determine the density of a metal along with the density of distilled water. In an attempt to help the experimenters more thoroughly understand the relationship between concentration and density.…
In this experiment we were wanting to find the specific heat of an unknown metal and determining what metal it was by using the formula q=c X m X change of temperature. We did two trials to compare the two and see what we come up with.…
74. b) Select one example of a physical change from your table, and explain why it has a physical change.…
Purpose: In this experiment I will determine the mass, density, volume, lengths and temperatures of different objects and liquids to help me better understand the importance of Chemistry and how Chemistry plays a big role in our everyday lives.…
.2400 grams of the unknown compound. This is done in duplicate and purple-tinted precipitates are placed in Gooch crucibles. The precipitates are suction dried using ethyl alcohol then acetone to…
Which one of the following substances will float in gasoline, which has a density of 0.66 g/mL?…
Tervis, a term coined by combining the last three letters of two last names, Mr. Frank Cotter and Mr. G. Howlett Davis. These two engineers realized when completely sealing air between two plastic walls makes a great insulator and the Tervis tumbler was born. The inventors sold the rights and the company to the current owners in the 1960s. Tervis is still owned by the Donelly family and is located in Florida. Tervis offers a fun, custom, easy to maintain, “green” alternative to the ordinary water bottle or coffee cup with a variety of sizes and styles insulated cups.…
Toxicant Scavenger Hunt and Toxicant Treatment Plan Reference List Cristina Garfield, Dianne Klabunde, April Wells, and Stephen Wood ENV/410 Environmental Toxicology January 11, 2013 Professor Niladri Sarker Toxicant Scavenger Hunt and Toxicant Treatment Plan Reference List Brandt, A. D. (1947). Industrial Health Engineering. John Wiley and Sons, Inc.…
CHEMISTRY JC2 Preliminary Examination Paper 1 Multiple Choice Additional Materials: Data Booklet Optical Mark Sheet (OMS) 9647/01 23 August 2011 1 hour…
Toluene is a clear colorless liquid that has an aromatic odor. It ignites in air at 40 degrees Fahrenheit. It is also less dense than water and because so will float atop it. Toluene is non-corrosive.…
to mental disorders. If a mother is exposed to viruses or toxic chemicals while she is pregnant that may play a part. Use…
3. Are other risk factors associated with damage from this teratogen. That is, who is most…