FON241LL Lab 1 SAFETY, EQUIPMENT, AND THE SCIENTIFIC METHOD Name: ___Arielle Lake________ 1. You are working in the laboratory and break a glass test tube. Explain the procedure that should be followed. (5 pts.) You dispose of it in the designated container for broken glass.
Hypothesis: Using melting points can help determine the difference in total carbon atoms and branches between two or more compounds. Materials List: 1 Spoon 1 Paper towels 3 Small rubber bands 2 Clean sheets of paper 1 Beaker, 100 mL, glass 1 Burner-fuel 1 Burner-stand 1 Goggles-Safety 1 Magnifier, dual 1 Thermometer-in-cardboard-tube 1 Capillary tubes-3/pack 1 Tetracosane Crystals - 0.2 g in Vial 1 Tetradecanol Crystals - 0.2 g in Vial Procedures: Prior to beginning the lab exercise, read the instructions carefully. Begin by setting up a derivative melting point table to collect the data accumulated during the exercise. This lab uses heated water so be sure to follow safety procedures carefully. While conducting this laboratory experiment, be sure to use minimal amounts of each substance in order to create the habit of using only the amount necessary.
LAB 6 ANALYSIS OF WATER IN PHOSPHATE Name: Lab Partners: None Date of Experiment: November 13, 12 Location: My House Course Number: CHE111C21 Abstract: In this experiment, we used a simple colorimeter and Beer’s Law to find the concentration of a tap water sample. A Beer’s law calibration curved was drawn showing the absorbance of varying concentrations of phosphate. Phosphate solutions will produce standard colors when mixed with ammonium molybdate and stannous chloride. The concentration of the unknown solution containing phosphate will be determined using the calibration curve. A voltmeter was used to measure the electrical resistance of different solutions.
Seaweed Lab – Summary Our focus questions for this lab are the following, How can I make a pharmaceutical product from seaweed and can a single substance be isolated from a mixture, what is this substance? The chemicals used in this experiment to help us answer these questions are: Iodine crystals, tincture of iodine from a pharmacy and Laminaria or seaweed. The objective is to make a tincture of iodine. Iodide will be added to iodine, and a Bunsen burner will be used to heat and filter the solution. The seaweed will be cut and weighed (6 grams) and transferred into 150 mL solution.
Joel Barlow High School Honors Biology Michael Klein Wassink 11-5-2014 Lab: pH, Buffers & Biological Substances Problem How do organisms survive and function despite metabolic activities that tend to shift pH toward either acidic or basic ends of the scale. Hypothesis I predict that as I add varying amounts of 0.1m HCl and 0.1m NaOH to various biological substances the pH levels of those biological substances will go down with the addition of HCl and up with the addition of NaOH because Acids (HCl) release H+ into substances which makes their pH levels go down, and Bases (NaOH) accept H+ from substances which makes their pH levels go up. Materials • 4 goggles • 4 aprons • 50ml beaker • 1-100ml-grad cylinder • 3-colored pencils • Wide range pH paper • Tap water • Forceps • HCl (0.1M) • NaOH (0.1M) • pH 7 buffer solution • Milk • Potato homogenate • Egg white • Gelatin suspension Procedure 1. Pour 25ml of tap water into the 50ml beaker. 2.
Hydrate Lab The purpose of this lab is to analyze the percent water in a crystalline hydrate and to indentify the hydrate from a list of possible unknowns. The solid hydrate will be heated to remove the water, and the percent can be found by measuring the mass of the solid before and after heating. The hydrate will be indentified by comparing the percent water in the hydrate with the percent water calculated for the possible unknown. Before the lab there are pre-lab questions: 1. Describe the three general safety rules for working with a Bunsen burner.
The Loss and then Retrieval of Copper through Multiple Reactions Lab Partners: Justin Dunn and Alexis Almaguer Experiment #2 Section: 506 Intro: All science occurs within rules. One very important rule is that matter can neither be created nor destroyed and this rule will be expressed and proven in this lab by removing copper and then regaining it through multiple reactions, heating, and stirring. This experiment allows the students to learn the different types of reactions as well as learn new techniques within the laboratory such as vacuum filtration and handling hot glassware, but most importantly proves the law of conservation of mass. Materials and Methods: to begin the experiment a 50 ml beaker, hot plate, plastic funnel, aspirator,
Moreover, the solvent-free tosylation step of the reaction leads pedagogically to a discussion about green chemistry. KEYWORDS: Second-Year Undergraduate, Laboratory Instruction, Organic Chemistry, Hands-On Learning/Manipulatives, Alcohols, Aldehydes, Green Chemistry, NMR Spectroscopy, Thin Layer Chromatography, Synthesis Scheme 1. Synthesis of β-Citronellyl Tosylate I t has been a tradition in chemical education to use examples of compounds in “real-world” applications to illustrate esoteric concepts.1 Although many of the applications in textbooks and the chemical educational literature are biological and medicinal in nature, examples using soaps,2 essential oils, perfumes, and cosmetics can be traced back to the 1940s. There are several earlier articles published in this Journal that describe the chemical composition of essential oils,3 whereas more recent lab experiments focus on the synthesis of perfumes.4,5 Sulfonates of several compounds are used as additives in the perfume industry, especially for laundry and other cleaning detergents. One such sulfonate used as an additive to
The experiment was divided into two parts using a different apparatus for each part. Part A: For this part of the experiment, the used apparatus was constructed by a pump type Dayton Split phase A.C. Motor 1/5 HP 1725 rpm 115 V sf 1.0 manufactured by Dayton Manufacturing Company, a tank, pipes (L drawn copper tubing type), valves, well type manometer, 1 venturi meter, 1 orifice meter and 4 pressures taps (figure 1). According to Daniel measurement, the theoretical accuracy of orifice meter is +/- 1% and the theoretical uncertainty of venturi meter is +/-1.0 %. Flow calibration is necessary for critical measurement and it results in +/- 0.25 % of uncertainty. The well type nanometer uncertainty is +/-1/2 of the smallest scale graduation.
CMY282 EXPERIMENT 5 ANSWER SHEET PARTIAL MOLAR VOLUMES Name: …………………………..……………… Student number: …………………………..…………….… Title: Abstract: Results 1. Volume calculations Temperature: ρw = (from Table 6-1) Table 6-2: Calculation of volumes of water and ethanol Xw XE Vw (cm3) VE (cm3) 1 0.8 2 0.6 3 0.4 4 0.2 2. Preparation of the liquid mixtures and calculation of their exact mol fractions Table 6-3: Calculation of the composition of the actual samples Empty Flask m0 (g) Flask + W mA*(g) Flask + W + E mB*(g) mA* - m0 mw (g) mB* - mA* mE (g) mw/Mw nw (mol) mE/ME nE (mol) nE/(nw+nE) XE Water - - - - - - - 0 1 2 3 4 Ethanol - - - - - - - 1 3. Determination of the volume of the pycnometer Mass of empty pycnometer: g Temperature of the waterbath: ____ C Mass of full pycnometer: g .̇. Mass of the water: g .̇.