Solid-phase synthesis

During the experiment, observations were made about their physical appearance. In part I, reaction one produced a blinding, bright white light when the metal burned and the metal turned into a white powdery substance. For reaction two, there was no reaction at first and it took a long time for it to react, but then bubbles started to form around the magnesium ribbon and the substance turned into a pink-yellowish color around the magnesium strip when it was placed in the 150 milliliters beaker.…

ethyl-4-aminobenzoate, and acetanilide, two of them were randomly given out, weighing 75 mg each. These mysterious substances were both placed in a 25-mL flask with 6 mL of diethyl ether. The substances with the diethyl ether were mixed together until the solids dissolved. The solution was cooled in an ice bath for a couple of minutes. Once the solution was cooled, 3 mL of 3M HCl was added and swirled into the solution. The top of the 25-mL flask was capped and the two liquid were mixed in a…

1) Important solubility characteristics for a solvent to be used in the crystallization of an organic solid that’s contaminated with impurities is that the organic solid should have low solubility at low temperatures in the solvent, but highly soluble at high temperatures. Also, the solvent should allow the impurities to be either completely soluble or completely insoluble at all temperatures. 2) One way to improve our percent recovery is by making a second crop of crystals by removing the…

Written Exercise Paragraph 1 1. Lattice symmetry of quartz, α-FePO4 and β-FePO4: Quartz has a trigonal lattice structure with space group P3121 (group no. 152). At any temperature below 980K, Iron phosphate exists as α-FePO4, which has a trigonal lattice structure with space group P3121 (group no. 152) where iron, phosphate and oxygen occupy Wyckoff position 3a, 3b and 6c respectively. As the temperature rises up to and above 980K, α-FePO4 exhibits α-β transition and becomes β-FePO4 that shows…

PARAGRAPH 1 Comparing the crystal structure of α-FePO4 & β-FePO4 Firstly, the crystal structures of the alpha and beta Iron Phosphate can be identified from the paper. The lower temperature form, α-FePO4, has the space group P3121, while the higher temperature form β-FePO4, has the space group: P6422. These space groups translates to the lattice symmetry of trigonal and hexagonal respectively. The two space groups are chiral. α-FePO4 is the main form of Iron Phosphate in room temperature since…

in structural parameters during this transition. The stark contrast is that during the α phase, there are huge thermal expansions or contractions that present a non-linear angular variation. This is the same concept as expansion occurs when temperature increases and thus there will be an increase in volume which is related to the tilting of the tetrahedra.…

Observation & Calculations for Nanorefrigerant Graph of C.O.P. vs. Nanoparticle Concentration for Nanorefrigerant. C.O.P RESULTS WHEN NANOPARTICLE MIXED IN R134A & POE OIL Figure 5.1. Graph of nanorefrigerant C.O.P vs. nanolubricant C.O.P. 5.2. GRAPH OF PERCENTAGE CHANGE IN THE COP OF THE SYSTEM Figure5.2. Graph of percentage C.O.P of nanorefrigerantvs. nanolubricant. Here the result shows the percentage change in the C.O.P when the air conditioning test rig run on the nanorefrigerant and…

The carbon supported PtFeS catalysts were prepared by a modified polyol method. In brief, 0.3 g carbon (Ketjen-black heat-treated at 2250 °C, SE = 160 m2 g-1) was dispersed in 135 g ethylene glycol. 5.993 g of 8 wt% H2PtCl6 (Umicore; Pt content, 39.8 wt%), 1.874 g of 8 wt% FeCl3. 6H2O (Sigma-Aldrich), and 0.352 g of 8 wt% (NH2)2SC (Sigma-Aldrich) previously mixed in ethylene glycol were added to the dispersion. The pH of the stirred reaction mixture was adjusted to ∼11 using 1 M NaOH dissolved…

Permafrost Remember Mood Rings? They were rings that change colors depending on your emotions. At least that’s what they wanted us to think. Mood Rings are really thermochroic liquid crystals that color changes based on the temperature of the finger. Something that seems so permanent like the color of a crystal is subject to change just by the mere change of the temperature of its environment. Some environments are also rigid and structured just like the crystals in Mood Rings, but yet, are also…

The topic for the experiment is how a cold pack can be improved. The problem statement is “Which chemicals would work best at lowering the temperature of water to improve a cold pack?”. The Independent variables are the are three chemicals, ammonium chloride, sodium chloride, and calcium chloride, that will be added to the water. The dependent variable is the temperature of the water in degrees Fahrenheit after the chemicals are added. The constants are the 50 mL of water in each cup, the…