electronic balance‚ the wight of a copper slug will be determined by also utilizing direct weighing and weighing by difference. Average mass of a copper slug will be calculated using five (5) copper slugs and an electronic balance. Lastly‚ the mass of two unknown weights will be determined using the electronic balance and the weighing by difference technique. The mass of a cooper slug can be determined accurately by both direct weighing technique and by weighing by difference. Using the electronic balance
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The tube that contained my unknown material was tube number twenty. I did a gram stain‚ oxidase test‚ and used three different medias to narrow down and identify my unknown organism. The first step I took in identifying was a gram stain. This gram stain would reveal whether my organism is gram positive or gram negative which would narrow my choices from fifteen options down to six. After completing the gram stain‚ my unknown was the color pink. This revealed my unknown as being gram negative. I
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Experiment #17 Classification of Chemical Substances Prepared for: Dr. Robert O’Reilly By: Kudaibergenov Baizak 20.11.2013 Nazarbayev University Introduction While many thousands of substances are known‚ they can be classified into a few simple categories based on type of bonding that exists among the atoms in the substance. Bonds are chemical forces that hold atoms together to form molecules or compounds. These categories are ionic‚ molecular and metallic substances.
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the melting point of both pure substances and five mixtures of different ratios. The purpose of the second section was to identify an unknown sample by measuring its melting point and mixing it with two known substances and comparing them. The results suggest that the eutectic point is closest to the weight % ratio of 10/90 naphthalene to biphenyl and the unknown sample is acetamide. Introduction: One way to establish the purity of a substance is to measure its melting point. A pure substance
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R3=300Ω Unknown Resistor Number | L1 (cm) | L2 (cm) | σL (cm) | Rx=L2L1R3 ( ) | σRx () | Rm (Ω) | 1 | 67.7 | 32.3 | .01 | 143.1 | .03 | 147.7 | 2 | 58.4 | 41.6 | .01 | 213.7 | .06 | 214.8 | 3 | 43.9 | 56.1 | .01 | 383.4 | .20 | 385.5 | 4 | 23.5 | 76.5 | .01 | 976.6 | 1.2 | 979.8 | For the unknown resistor 1‚ Rm is not in the range for my calculated value. For the unknown resistor 2‚ Rm is not in the range for my calculated value. For the unknown resistor 3‚ Rm is within
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Pencil 50 mL beaker Bunsen burner Nichrome wire Barium Nitrate Copper Nitrate Strontium Nitrate Lithium Nitrate Potassium Nitrate Sodium Chloride Calcium Nitrate Unknown solutions A‚B‚ & C Hydrochloric Acid Wash bottle (with distilled water) Procedure: 1. Label the test tubes with the names of the solutions and unknowns. 2. Place about 5 mL of each solution into each test tube‚ and 10 mL of Hydrochloric Acid into the 50 mL beaker. 3. Clean the Nichrome wire before each test. To do this
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I was able to come to the conclusion that my unknown is Klebsiella pneumoniae through the use of Bergey’s Manual. After performing a gram stain of my unknown I was able to determine that my unknown was a gram-negative rod. While testing the oxygen requirements my test tube had growth throughout the tube‚ indicating my unknown was a facultative anaerobe‚ which can grow in the presence or absence of oxygen. The most important test was whether my unknown was motile or nonmotile. My test tube only showed
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oligosaccharides‚ and polysaccharides are theclassifications of carbohydrates. This experiment involves the carbohydrates starch‚ glucose‚ fructose‚ maltose‚ xylose‚ and sucrose. These carbohydrates are the standards to be used in determining the unknown sample with the help of the Barfoed’s test‚ Benedict’s test‚ Bial’s Orcinol test‚ Seliwanoff’s test‚ and Iodine test. Introduction Carbohydrates are the single most abundant class of organic molecules found in nature. Along with proteins and
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this experiment‚ the osmolality given by the machine was equal to the molality. 1) Finding the identity of a unknown substance Molar Mass of Possible unknown substances (g/mol): * Glycine: 75.067 * Glucose: 180.155 * Mannitol: 182.171 * Sucrose: 342.26 * Lactose: 360.312 Results: Table 1.1: Table showing the results for the osmolality. 200mg of the unknown was dissolved with 10mL of doubly deionized water. A 0.2mL sample was taken and placed in the Osmometer. Trial
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to produce sodium chloride‚ water and carbon dioxide. Experimental Procedure: First the student will take the weight of a clean dry beaker and record the data. Next ass .15g of the first unknown substance. From there‚ the student will add 50ml of water to the beaker then dissolve the .15g of the first unknown substance into the water. Once the substance has dissolved‚ the student will add 10 drops of bromocresol (indicator) into the beaker. After the student will fill the buret all the way up with
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