The objective of this lab was to identify an unknown compound by determining the melting point range using fast and slow ramps. Also‚ to determine the eutectic point of Urea and Cinnamic Acid. An unknown compound that was numbered 8 was chosen. A small amount of the unknown compound was placed in a weighing paper using a spatula. The weighing paper was folded in half twice and then was grinded using a spatula. After the unknown compound was grinded about 1-2mm was added into a capillary tube. A
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S. citizen) (select one) Yes No Country of birth: Specify_______________________________ 13. Month-Year Arrived in U.S. Month Year If YES‚ enter year of previous TB disease diagnosis: 14. Pediatric TB Patients (2 months? (select one) Yes No Unknown 16. Site of TB Disease (select all that apply) Pulmonary Pleural Lymphatic: Cervical Lymphatic: Intrathoracic
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Objectives 1. To separate a mixture of an acid and a neutral compound into its component by extraction. 2. To determine the melting point and the yield of the benzoic acid and the unknown sample. 3. To determine the unknown sample whether is is Trimethylmethanol or 1‚2‚4‚5-Tetrachlorobenzene. Introduction Extraction is a process of transferring a solute from one solvent to another. It is usually used to separate one or more components from a mixture. Diethyl ether‚ dichloromethane
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Jahzeel Morales Jessa Arellano September 19‚ 2014 Period 4 Lab #1: Density Determinations for Solutions Theory: The density of a sample of matter is very useful when trying to find the identity of an unknown substance. The units of density are quoted in (g/mL) for liquid samples of matter. For that reason if the volume is known of a liquid‚ determining its density is easily determined by weighing it accurately. Density can also be used as a tool for finding the concentration of solutions
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solvent‚ m stands for the molality (mol solute/kg solvent) of the solute‚ and i stands for the van’t Hoff factor of the solute. In this experiment‚ the freezing point of depression will be calculated for two unknown solutions in order to determine the molecular weights and identities of the unknowns. Experimental For Part A of this experiment‚ an ice and salt bath was prepared by first filling a 150mL beaker full of ice and weighing out approximately
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I. Signatures: ____________________ ____________________ ____________________ ____________________ Title: Determination of Molecular Weight of a Volatile Liquid By Vaporization: Dumas Method Background of the Study Problem In this experiment‚ an unknown liquid is in need to be identified and one of the key factors to identify it is to determine its molecular weight. In order to determine the molecular weight of a particular substance which in this experiment’s case is a volatile liquid‚ the need
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solid. Such properties include melting point‚ mixed melting point‚ and IR spectrum. With these properties‚ one will be able to compare their results of the organic solid to see if any other classmates have the same unknown sample. B. Timeline: Step one: Obtain a sample of the unknown colorless organic solid. (make sure it is about 1-2mm in amount)/ Obtain materials to grind the solid into fine fragments so that it is able to fit into the capillary tube. Step two: Obtain materials that
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Unknown reports in microbiology are written in scientific format. Scientific writing is written differently from other types of writing. The results of the exercise or experiment are what are being showcased‚ not the writing. The purpose of scientific writing is not to entertain‚ but to inform. The writing should be simple and easy to understand. There is a specific style that must be followed when writing scientific reports. Scientific writing is typically written in the passive voice. The
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circles the mind‚ it is the unseen. Books‚ movies and society in general present the “unseen” and the “unknown” to develop the characters and plots. Gathering Blue by Lois Lowry illustrates the “unseen” and the “unknown” through the rumors associated with the beasts. Kira‚ the main character‚ along with her friends discover the truth from exploring what society does not see. The “unseen” and “unknown” elements throughout the novel facilitate Kira’s knowledge of the dystopian society as well as her future
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positive 3. unknown 1 (1 point) negative 4. unknown 2 (1 point) negative 5. unknown 3 (1 point) positive 6. unknown 4 (1 point) positive 1. List whether each of the following substances was positive or negative for starch‚ as indicated by using iodine. (7 points) 1. onion juice (1 point) positive 2. water (1 point) negative 3. cornstarch (1 point)positive 4. unknown 1 (1 point) negative 5. unknown 2 (1 point) positive 6. unknown 3 (1 point)
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