Ocean County College Department of Chemistry [Observations of Chemical Changes] Submitted by Andrew Grimm Date Submitted: 5/31/14 Date Performed: 5/31/14 Lab Section: Chem-181DL2 Course Instructor: Amal Bassa Purpose The main goal in this experiment is to observe the properties of simple chemical reactions, and relating their chemical properties to household products. Procedure To begin this experiment I placed two drops of NaHCO3 into well A1 of the 96-well plate, and then added two drops of HCl into well A1. Next I placed two drops of HCl into well B2, and added two drops of BTB, and observed the color. Then I placed two drops of NH3 into well C1 and added one drop of BTB, and observed the color. Next I added two drops of HCl into well D1, and then added two drops of blue dye, and recorded what I saw.
EXPERIMENT: TECH 0704, Distillation, macroscale technique only, simple and fractional: Substitute a mixture of 25 mL ethanol and 25 mL water for the toluene/cyclohexane mixture. Record the temperature at 2 mL intervals of distillate. Use glass beads to pack the fractionating column. Construct a graph of temperature vs volume for each distillation in your lab notebook. Compare the efficiencies of the two distillation methods in your lab notebook.
Liquids & Solids Pre Lab Questions: 3pts 1. What are the learning goals of this lab? The goal is to view and experience the melting point and boiling point of different substances. 2. Why is acetamide not allowed in contact with your skin?
Once the chemicals had been organized I then place 2 drops of the first chemical and 2 drops of the second chemical into the allotted well. Once 2 drops of each chemical were placed in the well I stirred the mixture with a toothpick and observed the mixture. The observations of the various combinations were then noted. The following combinations took place in the experiment. NaHCO3 (sodium bicarbonate - baking soda) and HCl (hydrochloric acid).
Then you put the remaining liquid (neutral component mixture) through the suction filtration funnel to isolate the crystals. After 10-15 minutes, the crystals will be dry and you can weigh them and find their melting point. How is the neutral component of your 3-compound mixture isolated from the final methylene chloride solution? 16 of 22 4/16/12 9:15 PM StudyBlue Flashcard Printing of Lab Final 2211L UGA http://www.studyblue.com/servlet/printFlashcardDeck?deckId=... Name the four active ingredients that we will be testing for in the TLC of Analgesics lab: Ibuprophen Caffeine Acetaminophen Acetylsalicylic acid What solvent system will you be using to dissolve the common analgesics (power) in preparation for TLC spotting? Methylene chloride: ethanol (1:1 solution) What solvent system will you be using to "develop" your TLC plates in the TLC of Analgesics lab?
Experiment and Observation: Please note that this procedure was adapted from the “Anions, Cations, and Ionic Reactions” LabPaq Lab manual (Hands-On Labs Version 42-0304-82-00-01, 2015) Please reference this manual for further information on the lab experiments. The first experiment was to perform a qualitative anion test. This was done by observation of chemical reactions and recording the results in Data Table 1. Using the information from the reactions we were able to identify unknown substances and recorded the results in Data Table 1. Data Table 1: Anion Confirmation Tests Chemical | Anion | Addition of AgNO3 | Addition of HCl | NaBr | Bromide | Cloudy white thin solution | Clear with sedimentation | Na2CO3 | Carbonate | Clear with white sedimentation | Bubbles, sedimentation combined to one formation | NaCl | Chloride | Milky white, white sedimentation | No visible change | Nal | Iodide | Pale green cloudy, sedimentation | Sedimentation dispersed to smaller pieces, solution clears in color | Na2SO4 | Sulfate | No visible changes noted | Milky white | Na2S | Sulfide | Clear with amber sedimentation | No visible Change noted | Unknown #103 | CarbonateNa2CO3 | Cloudy white thin solution | Bubbles, Sedimentation combined to one
Ignatia was used in this experiment to see if it can yield similar effects and can relieve heat stress in C.elegans and prevent them from going into Dauer state. Methodology: First, E.coli and C.elegans (OP50 Strain) were purchased from Wards Biological Supply. Agar was then microwaved on and off for 1 minute. Followed by the Agar being poured into five 60mm x 15mm petri dishes. The E.coli from
Title: Bromination of (E) – Stilbene (Microscale Procedure) Author’s Name: Reinaldo George Professor: Elvis Barrett Date of Experiment: Thursday July 16th 2015 Institution: Nova Southeastern University Abstract The purpose of this experiment was to synthesize the second intermediate in the b series of Sequential Reactions by carrying out the bromination of (E)-stilbene to obtain meso-stilbene dibromide. This product is the precursor to diphenylacetylene, the next synthetic intermediate in the b series. A further purpose of this experiment is to demonstrate the stereospecific addition of bromine to alkenes. The percentage recovery was also calculated and recorded. On completion of this experiment; my lab partners and I were able to successfully synthesize the second intermediate in the b series of the
Experiment 4: Using Buffers Name: Andrew Duval Lab Partners: None Location: My House Course Number: Chem 112 Date: July 28, 2013 Abstract: This lab aims to teach us about the use of buffers, or in this case vinegar. Buffers are used to control the pH of a solution, because they are able to able to absorb strong acid or bases. Because of this fact, we can add acid or basic mixtures and control the outcome of the pH by also mixing a buffer in there as well. In this lab we will be adding 0.1M and 6M HCL and NaOH to a two mixtures. One mixture will contain vinegar, and the other will contain distilled water.
The first was done by setting up a Reflux apparatus in order to heat the reaction mixture which contained 2.5mL of isopentyl alcohol, 3.5mL of glacial acetic acid, and 0.5mL of concentrated sulfuric acid(catalyst). The mixture was left to boil for 60 minutes(1hr) with a boiling stone inside the heating vial for mixing. After completion of the heating process, the vial with the product was left to cool to room temperature. The next step was to extract the organic layer of the product. First, the product was transferred from the heating vial to a centrifuge tube