Solid-phase synthesis

The main purpose of this experiment is to purify an impure solid by the technique of recrystallization. This technique involves several steps, selecting an ideal solvent, dissolving the compound in a minimum amount of boiling hot solvent, filtering insoluble impurities while the solution is hot; crystallizing the purified compound, and isolate the pure compound by vacuum filtration . The unknown used in the experiment was #4, which were white crystals. In order to determine the ideal solvent…

temperatures, FePO4 takes on its α-phase structure, which is tetrahedral. α-FePO4 then gradually transitions as the temperature increases to β-FePO4 in terms of structure. This first-order transition occurs at 980K. However, this transition is not linear. For α-FePO4,…

Title: What was the effect of different types of salt on height of ice cream formation? Purpose The purpose of this experiment was to find out if there was any correlation between different types of salt and the final height of ice cream formations. Background Information Milk is made up of triglycerides (mainly milkfat) dispersed throughout water as an oil-in-water emulsion, or dispersion of globules of one liquid into another. When agitated, the emulsion begins to break down, or coalesce…

and Boiling Points: The particles/substances which are present in a metal are held or joined together by strong metallic bonds. A lot of energy is used to separate these particles. That is why metals have high melting and boiling point. Metals are solid as well as crystalline. They are arranged in a regular pattern and are held closed together. 2. Electrical Conductivity: Metals conduct electricity. The sea of delocalized electrons are mobile and are free to move around in the 3D structure of…

Methods and Materials 0.4g maleic anhydride and 1ml ethyl acetate was added to a test tube and mixed until dissolved. 2ml hexane was then added to the test tube, followed by 0.4ml cyclopentadiene. The test tube reacted for 5 minutes in a test tube rack and then 2 minutes in an ice-bath to allow for complete crystallization. The crystals were then put through the filtering apparatus to collect and dry all the crystals. About 3ml was used to rinse the crystals while in the apparatus. The…

an example of crystalline structure. When the water begins evaporating, the amount of salt stays the same. As water evaporates, the salt molecules are pushed even more closely together, which causes more salt out of the water and into a solid form. The solid form will then come into a salt crystal. When most of the water evaporates, there is no water left, because of this, the salt crystals begin to form. If the water does not evaporate fast, the salt crystals will take more time until the…

unknown salt (#3) using ion-exchange chromatography by analyzing the inorganic salts of the unknown salt, which can be examined by acid-base titration using ion-exchange resin. The stationary phase is made up of acid groups which will attach to the resin, which is then rinsed down the column with water. The mobile phase contains the inorganic salt dissolved in a solvent, which is then added to the column. As it goes down the column, an exchange of H+ ions and cations occur. The solution…

During the first century B.C., the Phoenicians invented glass blowing "in the vicinity of the Palestinian coast" (History of Glass). Used for jewelry, decorative pieces, or vessels, blown glass has been a significant type of glass, having been practiced by numerous cultures across the world. However, glass blowing is a tedious task, requiring "extreme patience, tenacity, and dexterity" and is a long, multi-step process (Sacramento Art Glass). Over time, the difficulty of these numerous steps has…

using 3-pronged clamp. The flask was lowered into a slightly depression in the sand without touching directly to the sand. The mixture was then boiled gently at the boiling point for 10 minutes, removed from the heating, and settled for a minutes. The solids were then left behind while the liquid was transferred into the pressure filtration assembly…

1) Explain how the Lin et al. used the catFISH technique to determine which neurons are involved in particular behaviors (3 pts) Lin et al. used catFISH (cellular compartment analysis of temporal activity by fluorescent in situ hybridization) to compare the activation of c-fos expression during two successive episodes of behavior (either the same behavior or different) in the same animal. Through experimentation, researchers discovered that animals killed five minutes after fighting expressed…