After the addition of nitrating mixture remove the flask from ice bath and allow to stand for 1 hour. Then transfer the reaction mixture in to 200 mL water containing a piece of crushed ice to get crude p-nitroacetanilide. Allow it to stand for 15 minutes ,filter on a Buchner funnel with suction ,wash with cold water and dry in an oven at 100 0C.o-nitroacetanilide is also formed together with p-isomer but being more soluble in water remains in the filtrate. Recrystallize a portion of crude product from rectified spirit when pale yellow crystals of pure p-nitroacetanilide are obtained. Mechanism: Reaction
o Put several metal spoons inside a freezer to let it cool for 10 minutes. Take one spoon out from the freezer and apply it directly on your hickey with direct pressure. If the spoon loses its coolness, you may place it back inside the freezer and use another spoon instead. Do this for 20 minutes and repeat for several times a day. • HOT TREATMENT: After applying cold treatment for 48 hours, you need to swap treatment to hot.
1. 150 ml of boiled water was poured into each of the three beakers labeled A, B, C. 2. Five tea bags were soaked for the time given by the manufacturer (two minutes) , in beaker A (Control). The teabags were immediately removed after the time elapsed. 3.
Swirl the flask and allow the reaction mixture to stand at room temperature for 20 minutes. 5. Add 2 mL of cold water and warm on a steam bath for 5 minutes. 6. Cool the resulting mixture in an ice bath to precipitate a solid.
The effect of the solution concentration of sodium chloride on diffusion in yam cores compared to the solution concentration of water Abstract The purpose of the experiment was to see if different solution concentrations had an effect on diffusion. Our group established a hypothesis that stated; sodium chloride will make the yam cores weigh less than in water. In order to start experimenting, we obtained 10 yam cores, weighed them and placed them in five cups that contained 50 mL of water. At 10-minute intervals, we would take them out and weigh them again for 30 minutes. We repeated this experiment using another five set of cups that contained 50 mL of 1M sodium chloride.
Next, transfer the sample to a 50 mL beaker and mixes with distilled water, which gets by rinsing the crucible with its cover in 8mL, so the solution is generated. After that, put an aluminum wire into the beaker, and after a certain period of time the solution gains color. To finish the reaction, 5 drops of 6M of Hydrochloric acid is added into the beaker to clean the solution, which means that acid dissolves all salts of aluminum that is on the solution. After finishing the chemical process, collect and use the Butcher funnel to wash the cooper because it is going to be used to a vacuum filtration. After finishing the filtration, measure the weight of the sample and dry it.
The best way to get rid of diamondbacks is to simplyleave them alone.Youcan also use a diamondback trap to catch them.Rattlesnak have a forked tongue that they flick up and down.The tongue picks microscopic airborne particles and gases from the air. Diamondback snack isn’ttoo picky about their habitat.It can be found living in desert,grassy,plains,forest,rocky hillside’s and an area along the coast.Diamondback snakes eat mice,rats,rabbits,gophers,birds,lizards and any other small animals. They have many predators and not always do they want to eat them. Animals such as deer, antelopes, cows, horses regard the diamondback as a threat. They may try to trample or stommped on the snake.
In my data table, I recorded the volume of the quarter and the the water in the graduated cylinder. Next, I removed the water and the quarter from the graduated cylinder and poured 50 mL of water again. I repeated this until I got results for all three coins. To find the volume of each coin, the formula I used was volume of water and coin - initial volume of water ( 50 mL ). To find the density, I divided the mass and the volume of each
After all this setup rubber stoppers were put in the fermentation tubes and the baseline was marked. In five minute intervals the distance in mm from the baseline mark was monitored. This distance represented the amount of carbon dioxide produced by yeast. This was done for 20 minutes. Results Table 1: The rate of production of CO2 by yeast Time (min) Displacement
Most species have five rows of paired tentacles on the surface of the body that are used for locomotion and for feeding. Depending on species, their sizes are usually range from 10 – 30 cm long. It is of interest to know that the wall of sea cucumber bodies is formed by collagen. This allows them to make their body loose or tight allowing the animal to squeeze and get in and out of small crevices and cracks. This remarkable feature keeps animals away of predators.
32 100 μL of afore-prepared sample solution and the mixed reference standard were diluted 100 times with ethyl acetate. 50 μL of these dilution solutions were separated on the TLC plate coated with SNISG. The plate was developed with petroleum ether: ethyl acetate (4:1) and the movement of solvent was usually controlled at 1 cm from the upper edge. After completion, the plate was dried until no solvent smell remained. It was sprayed with an ethanol solution containing 10% sulfuric acid, and heated at an infra-red drier until obvious color came up, as shown in Fig.2 (B.ab).