Procedure: A sand bath was set atop a hot plate set at power level 5, while a 10 mL round bottom was prepared with the addition of 14 (0.33 mL) drops of olive oil and 1 mL of cyclohexene. Once the contents of the 10 mL round bottom were mixed thoroughly, a boiling chip was added, and the round bottom was attached to a reflux condenser apparatus. The reflux was run for 20 minutes starting at the point in time when the mixture within the round bottom flask (that was submerged in the heated sand bath) began to boil. While the running the reflux, a 5 ¾ inch Pasteur pipette was obtained and clamped vertically with the tip facing downward. A small amount of glass wool was placed inside of the pipette and pushed down to block the narrowing end by a wooden boiling stick. A total of 100 mg (0.100 g) of celite was weighed out and was carefully added into the pipette as an additional layer atop the glass wool stopper.
Once the 20 minutes elapsed, the reflux-round bottom
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Before being placed in the ice bath, the product appeared to have a golden tint to it and was fairly fluid. After the ice bath, the product remained fairly fluid, however, it appeared to take on a more cohesive droplet form and the color was less pigmented. In addition to this, the bromine test performed at the end of the investigation yielded slightly varying results. The color change identified in the case of the bromine/dichloromethane and added 5 drops of olive oil turned out to change the original orange/red color of the bromine/dichloromethane to a clear and unpigmented liquid. The addition of hydrogenated olive oil (product) to the originally orange/red colored bromine/dichloromethane ended up turning clear similar to the addition of olive oil, however, there appeared to be a slightly yellow tint to the resulting liquid as
Triphenylmethyl Bromide. A 400 mL beaker was filled with hot water from the tap. Acetic acid (4 mL) and solid triphenylmethanol (0.199 g, 0.764 mmol) were added to a reaction tube, with 33% hydrobromic acid solution (0.6 mL) being added dropwise via syringe. The compound in the tube then took on a light yellow color. The tube was then placed in the beaker and heated for 5 minutes. After the allotted time, the tube was removed from the hot water bath and allowed to cool to room temperature. In the meantime, an ice bath was made utilizing the 600 mL plastic beaker, which the tube was then placed in for 10 minutes. The compound was then vacuum filtered with the crystals rinsed with water and a small amount of hexane. The crude product was then weighed and recrystallized with hexane to form fine white crystals, which was triphenylmethyl bromide (0.105 g, 0.325 mmol, 42.5%). A Beilstein test was conducted, and the crystals produced a green to greenish-blue flame.
This experiment was divided into two main steps. The first step was the addition of bromine to trans-stilbene. Trans-stilbene was weighted out 2.00g, 0.0111mol and mixed with 40ml of glacial acetic acid in 100ml Erlenmeyer flask on a hot bath. Pyridinium hydrobromide perbromide of 4.00g, 0.0125mol was added carefully into the flask.
It can be lost due to incomplete reaction with Hydrochloric acid. Melting point was performed on the product and indicates that the product has the melting point of 201.75 C whereas its literal melting point is 203C, as seen in table 2. The melting point of the product only deviates 1.25 ̊C from the accepted melting point. Even though it is within the acceptable range ±2 ̊C from the acceptable melting point, and it is considerably pure, the diacid product is not as pure as the anhydride product. The impurities might be from the leftover anhydride product from incomplete reaction since the heating was insufficient since the temperature sometime fell below the range of 60-80C during the heating
Firstly, an amount of 40.90 g of NaCl was weighed using electronic balance (Adventurer™, Ohaus) and later was placed in a 500 ml beaker. Then, 6.05 g of Tris base, followed by 10.00 g of CTAB and 3.70 g of EDTA were added into the beaker. After that, 400 ml of sterilized distilled water, sdH2O was poured into the beaker to dissolve the substances. Then, the solution was stirred using the magnetic stirrer until the solution become crystal clear for about 3 hours on a hotplate stirrer (Lab Tech® LMS-1003). After the solution become clear, it was cool down to room temperature. Later, the solution was poured into 500 ml sterilized bottle. The bottle then was fully wrapped with aluminium foil to avoid from light. Next, 1 mL of 2-mercaptoethanol-β-mercapto was added into fully covered bottle. Lastly, the volume of the solution in the bottle was added with sdH2O until it reaches 500 ml. The bottle was labelled accordingly and was stored on chemical working bench.
Plasma is one of the three components of blood and contains all the clotting factors found in blood. From the plasma many different products are manufactured, these are fresh frozen plasma or when the plasma is split into its different components. Plasma is obtained from voluntary donors who donate just plasma via an apheresis machine or they donate whole blood which then gets centrifuged to separate the plasma from the rest of the blood.
In the second experiment with the green color, I can safely conclude that the color green in this case is very soluble and we would need longer filter paper, perhaps more time to safely separate the different colors that make up the color green.
One of the major problems with conventional ice cream shops is the poor transition of sales into the winter months. For years traditional shops have had to find other sources of income or have had to drastically change their targets as the seasons change. Hot Snowballs is an ice cream shop with an additional coffee shop included that will ease the struggle of growing a new business through the colder months. The International Dairy Foods Association has determined that after August the sales for ice cream decline dramatically, and then rise again beginning in March (International Dairy Food Association). I have always had dreams of running a small business and I also have a passion for coffee and ice cream. Growing up, my parents shared their
1: Test with universal indicator. [IMAGE] Turn red turn And other colour. 2: Test with bromine water 3: test with 2, 4 DNPH [IMAGE][IMAGE] [IMAGE][IMAGE] [IMAGE][IMAGE] Decolourises No orange/yellow No [IMAGE][IMAGE]Bromine water Change precipitate precipitate 4: Phenol carboxylic acid 5: Test with an acidified potassium dichromate
The cold bluing compounds were tested on a barrel that was scratched by the gunsmith in the video. The first product that was tested was the “Birchwood Casey Perma Blue”. The test began with the gunsmith using a torch to heat the surface that was in need of repair. Next, the compound was applied to the barrel using steel wool. The gunsmith made not that the test site would be left to set up and change color.
o The remaining $125,000 up front charge would not be owed until ICEDELIGHTS provided one acceptable location and the lease was signed
About 1 gm. coarse powder was weighted and transferred to a 500 ml conical flask containing 100 ml of water. It was maintained at moderate boiling for 30 minute on water bath. It was cool and filtered in to a 100 ml volumetric flask. Volume was diluted by adding sufficient amount of water. The decoction was poured in test tube, and then shaken in a lengthwise motion for 15 seconds. They were allowed stand for 15 minutes and the height of foam was measured to determine the foaming index.
The use of ice baths as a form of recovery post-exercise is a controversial issue, as there is evidence which support both negative and positive effects. Athletes submerge themselves in baths containing ice in order to reduce post-exercise muscle soreness and to allow them to get back to training sooner with no ongoing soreness. However, Ice baths can endanger muscle growth as it causes the body to be unable to adapt to the demands of training and also can reduce performance due to temporary reducing muscle power. Ice baths are widely used in amateur and professional sports, therefore the outcome of this question is significant to sportsman everywhere. It is evident that ice baths are well known for their ability to decrease muscle soreness
Refer to Chemistry Lab # 2 – Investigating Changes. No changes have been made in this experiment. Methods = == ==
Four solutions were tested an out of the four only one had a color change, meaning that it had alcohol present. This solution was methanol and of course it would produce a color change because methanol is an alcohol. One solution that should have changed color was solution 4, the base-hydrolyzed aspartame, but it did not produce a color change when aqueous ceric ammonium nitrate reagent. Water and fresh aqueous aspartame are not going to produce a color change because there is no alcohol group in there structure.
Customer service clerk Katherine Tardif said, “Working at the Hotel de Glace is very unique and wonderful. It is like a big family. Each year, the team is fantastic. The Hotel de Glace is a really interesting project. Everywhere I go, I talk about it with such enthusiasm that everyone wants to experience this fabulous adventure”.