Chemical composition testing and analysis of samples, mixtures of substances, or unknown substances through our global laboratory network accurate analysis of the chemical composition of a material will provide invaluable information, assisting chemical problem solving, supporting r&d and ensuring the quality of a chemical formulation or product. Consequently, unknown number 5, similar to 2nd and 3rd substances, satisfies two categories of chemical substances and is assumed to be molecular-ionic compound the unknown number 6 had the lowest resistance: only 5 k, meaning that this compound is a relatively good electrical conductor. A substance can be identified by observing its chemical and physical properties physical properties are those that a substance can exhibit without undergoing a change in chemical composition chemical properties are those that a substance exhibits only by undergoing a change in chemical composition (ie a chemical reaction. Physical and chemical properties objectives the main objective of this experiment is to experimentally determine several chemical and physical properties of two unknown compounds and based on the set of properties identify each substance as either ionic or molecular.
Experiment: identification of unknowns introduction: preliminary classification by physical state, color, and odor 2 melting-point or boiling-point determination other physical data any unknown substance should be sniffed with the greatest caution as a first step, open the container, hold it away from you, and using your hand. The unknown compound and sodium chloride were put through the same reactions and consistently produced the same results, further indicating that the unknown compound is sodium chloride the gravitational analysis of the known and unknown substances provided similar results, backing up that the unknown substance was sodium chloride. Guide them (using student volunteers) into a coherent verbal explanation of how to complete all 5 tests in order to determine whether the unknown substance is ionic or covalent once they have decided how to articulate the process, emphasize that they must write down their answers.
- there are many different ways to classify a substance based on its acidity or alkalinity - indicators are used to classify substances indicators are organic substances that change colours at certain ph values. Esters, amides, and nitriles dissolve to a often be obtained about an unknown substance lesser extent, and acid chlorides or anhydrides by a study of its solubilities in water, 5% sodium react with water rather than simply dissolving in it. Lab report identifying an unknown compound purpose to determine the properties of six compounds and design an experiment to identify an unknown substance. The controlled substances act established five classifications, or schedules, for drugs regulated by law according to the dea , these classifications are broken down based on their potential for abuse and if they have a legitimate medical use.
- classification essay –the types of kids that make up my generation one of the things that has troubled me as of late is my generation the generation that is referred to is the group of people currently aged 15-21 - whether or not this is a generation, so to speak, is irrelevant. Identifying an unknown compound by solubility, functional group tests and spectral analysis this handout is a supplement to signature lab series anal 0727 and contains material adapted from. Classify each reaction using the information provided in the background section 2 classifying chemical reactions helps chemists to predict the possible products that will form when two or more substances are mixed.
Chemistry is the study of substances their properties, structure, and the changes they undergo micro-macro: the forest or the trees chemistry, like all the natural sciences, begins with the direct observation of nature— in this case, of matter. The aim of this experiment is to investigate the properties of several substances with the purpose of determining whether they are molecular, ionic, macromolecular or metallic introduction chemical substances could be named ionic, molecular or metallic substance, based on the kind of bond present in it we will write a custom essay sample on classification [. 1 the global harmonization system of classification and labeling of chemical substances (ghs) has been adopted by the occupational safety and health administration (osha) and the department of transportation (dot.
Classification of chemical substances introduction: depending on the kind of bonding present in a chemical substance, the substance may be called ionic, molecular or metallic. Periodic table of the elements, in chemistry, the organized array of all the chemical elements in order of increasing atomic number—ie, the total number of protons in the atomic nucleus when the chemical elements are thus arranged, there is a recurring pattern called the “periodic law” in their properties, in which elements in the same.
Forensics problem based learning scenario as an fbi forensics special agent, you are often asked to classify unknown substances found at the scene of a crime recently the fbi has found 7 mystery substances that need classification your mission is to test the 7 unknown materials so that all of their characteristics can be described. They have labeled the substance at the caterer's house substance 1 and the substance at the banquet hall owner's house substance 2 2 tell students that they will help figure out what each substance is by performing tests to identify the substances. Lab 2 essay lab 2 essay 944 words aug 28th, 2014 4 pages show more lab 2 1 identify the functional group or molecule for each of the following (3 points) and ultimately to be able to identify an unknown substance based on our studies and tests using the logic trees developed through the experiment a logic tree is a graphical display.