In-Lab Questions The laboratory work involves identification of an unknown by recording its infrared spectrum, investigating the major absorption bands, and comparing the spectrum with spectra of a group of known compounds. Identifying Unknown Compounds. Heat the test tube and note any condensation that may appear at the mouth of the test tube as evidence of dehydration, note the color of the residue. covalent. You will need to develop your own procedure for this lab by reading the material given in this hand out. Please print the worksheet for this lab. In these cases, it is a hydrocarbon (compound made from carbon and hydrogen atoms) that is combining with oxygen to form carbon dioxide and water. Compounds can be identified by two examinations like. Each of these powders can be superficially described as a “dry white powder”, but they have different chemical and physical properties. Covalent compounds are generally made up of what kind of elements Two non-metals 3. The goal of this lab is to identify all five of the unknown white powders you are given. You will not receive credit for lab if you have the same unknown number as another person in this lab section. According to my lab results, all the ionic chemicals had the same chemical properties as the unknown chemical; therefore the unknown must be ionic. But due to many chemical experiments and space explorations, many new compounds emerge which need to be identified. In order to be able to identify an organic compound, it needs to show the same physical and chemical properties as the known compound. Table 1. Please answer the following questions in preparation for the lab you will be performing: 1. Purpose. Chemical compounds are combinations of atoms held together by chemical bonds. To distinguish between . The group must also discover as many chemical and physical properties of the compound as we can. !If!the!reactions! Student Lab Guide Revision Date: 09/2019 2 viscosity.Because impurities will alter a compound’s physical properties, measurements close to the known values indicate that the substance is of high purity. We need to devise two syntheses of the compound, and compare them for cost effectiveness, safety, and potential yield of the compound. Even if you find one, you can follow few steps mentioned below in identifying the unknown compound. Chemical Change Desired: Combustion for engines and stoves. Lab – Properties of Ionic and Covalent Compounds. and . These chemical bonds are of two basic types – ionic . For each of the chemical compounds below, place a pea-sized (≈30 mg) amount of the compound (just enough to cover the bottom of the test tube) in a dry test tube and note its color. Exam Fall 2017, questions and answers Lab 2 - Lecture Notes L2 - Chromatography Methods: Separation Of Dyes Lab 3 - Lecture notes l3 Lab 5 - Lecture notes l5 Preparation of Alkenes by E1 and E2 Elimination Reactions Lab 2 Report - Lecture notes 2.4 Introduction. and. To identify the compound, the physical properties (smell, color, and state) need to be established. Experiment #3 Data & Report Sheet Unknown Number _____ Important: Be sure to enter your unknown number. compounds based on their physical properties. Use the generalizations from above to classify the following substances as ionic, molecular or classification not possible with information given. Chromic Anhydride (Jones’s Test) The Jones reagent is a mixture of chromic anhydride and dilute sulfuric acid (CrO 3 + H 2 SO 4 + H 2 O) in acetone. Chemistry 1011 Lab 11: Identification, Properties, and Synthesis of an Unknown Ionic Compound Page 5 one!can!conclude!that!the!unknown!compound!is!ammoniumchloride. Physical evaluation. In addition, careful determination of molecular. Whether it is combustion in the engine of a car or on the stove, combustion requires a chemical change. Ionic compounds are generally made up of what kind of elements A metal and a non-metal 2. 1. Properties of the Pure Substance Ionic, molecular or? 2. Chemical evaluation You will need this sheet to … ionic.