this experiment was to perform a liquid-liquid extraction method to extract the caffeine from the tea bags that were provided‚ and then recrystallize the caffeine. The solvents used in the experiment were an aqueous sodium carbonate and dichloromethane (DCM). Anhydrous calcium chloride pellets were used to dry the solution and emulsion layer and the DCM was then decanted. After washing the anhydrous calcium chloride pellets with more DCM‚ the solvent was evaporated‚ leaving greenish-white crystalline
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|Compound Microscope Parts | |[pic] | |A high power or compound microscope achieves higher levels of magnification than a stereo or low power microscope. It is used to view smaller | |specimens such as cell structures which cannot be seen at lower
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Complex and compound sentences Compound sentence O A compound sentence is a sentence with two or more independent clauses joined by: O a comma followed by a coordinating conjunction (and‚ but‚ or‚ nor‚ for‚ yet‚ so): The dog barked‚ and the cat yowled. O a semicolon: The dog barked; the cat yowled. Important Definitions O Independent Clause: O A group of words that makes a complete statement. It can stand alone as a sentence O Coordinating Conjunction: O A word that is used with a comma to
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Surgical extraction I start by escorting the patient into the surgery I put full personal protective equipment on myself and the patient‚ I have placed all needed instruments on the work top for the dentist to access. Instruments: * Mirror‚ probe and tweezers * Local anaesthetic equipment * Aspirator and saliva ejector * Hand piece (fast slow and straight) and surgical burs * Scapel‚ periosteal elevator and swabs * Retractors * Forceps * Elevators * Bone forceps
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Topic: In his book‚ Van Brummelen discusses "neutral curriculum." Define this concept in your own words and share your opinion on this idea. How does a Christian teacher’s responsibility apply to a Christian school? A public school? Discuss legal implications in both settings. If you have any personal experience with this topic‚ please feel free to share it with the class. According to Van Brummelen’s Steppingstones to Curriculum‚ “A curriculum must include a diversity of value positions without
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Identifying Ionic Compounds Written by Ashleigh Lara. In our experiment we were given 5 different cations who’s mixture of anions ranged from five to three different solutions. At every single station we were given the following materials a spot plate‚ a dropper‚ and the chemicals used to mix with our main substance. Each substance received 3 drops of the different chemicals which were able to give us an observation of what the compound was made into. Many of our experiments color‚ texture and solubility
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Experiment 4 Synthesis of Salicylic Acid Introduction Throughout history‚ botanical extracts have been used as medicines. Approximately 30% of all medicines have a plant origin. This number increases to 60% if you consider medicines that at one time were derived from plants‚ but have been synthesized in the laboratory. Salicylic acid is a white crystalline compound that can be isolated from the bark of birch trees. Since it is a valuable substance that can be isolated from nature‚ it is called
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coffee. The average pure caffeine yield was 0.330% with a standard deviation of 0.179. This yield is slightly higher than the yield of this report because of the error that occurred during the experiment. A small amount of coffee from the first extraction was stuck in the nozzle of the separatory funnel so it was removed with a pipet and then decanted. This resulted in a loss of product. The average impure caffeine yield was found to be .948% with a standard
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Staying neutral was George Washington’s best advice to the new United States. By staying neutral he did not have to see or worry about more death‚ choosing sides‚ or allies. Staying neural also ties in with staying out of foreign affairs so you get two in one. For example‚ “He had watched soldiers march barefoot leaving bloody footprints in the snow. He saw his troops ravaged by smallpox‚ starving to death.” (Lim‚ Jamison 2). George did not want to see more of his people get killed from war and
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Running head: The Impossibility of a Neutral Curriculum The Impossibility of a Neutral Curriculum The Impossibility of a Neutral Curriculum In an era of “keeping it real‚” there is an abundance of artificiality. A vast portion of the population prefers artificial intelligence‚ artificial sweeteners‚ artificial insemination‚ and artificial Christmas trees. However‚ I have yet to see a demand for artificial curriculum. Van Brummelen (2002) presents four
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