Hi i have tried 4 experiments at various temperatures to melt obsidian at varying temperatures it just bubbles up and i don't seem to reach a melting point. Melting point compounds, experiment 1 partial list of structures and melting points of the compounds used in experiment 1. Write a simplified report of melting point experiment just title, result, discussion and calculation below is the data: solid sample temperature starting melt end melting a 113 124 b 117 127 c 118 129 unknown#2 118 127 unk+c 115 125 unk+b 117 127. Explore how melting of ice cubes floating in water is influenced by the salinity of the water depending on the audience i use this experiment with, the learning goals are very different therefore, no one assessment strategy can be used for all different applications. In this experiment, the main objectives were to determine the effects of the following either on the melting or boiling point of organic compounds: 1) intermolecular forces of attraction and geometric isomerism on melting point, 2) purity on melting point range, and 3) intermolecular forces of attraction and branching on boiling point.
Experiment 1 - melting points introduction the melting point of a substance (the temperature at which a substance melts) is a physical property that can be used for its identification. Experiment 1 - melting points introduction the melting point of a substance (the temperature at which a substance melts) is a physical property experiment 4 melting points of organic compounds 1 background: the melting point of an organic solid is probably the most widely. Determining the melting point of a compound is one way to test if the substance is pure a pure substance generally has a melting range (the difference between the temperature where the sample starts to melt and the temperature where melting is complete) of one or two degrees. By taking a melting point of an unknown solid, you can compare it to a list of potential solids and their melting points and make a match to identify the solid another purpose of a melting point experiment is to use the melting point range of a substance to help determine its general purity.
The melting point decreases the further the composition is from purity, toward the middle of the graph in many mixtures, the minimum melting temperature for a mixture occurs at a certain composition of components, and is called the eutectic point (figure 67a) some systems do not have any eutectic. 9-12 151 melting and freeing points why do substances have speciflc melting and reeing points investigation proposal required yes no getting started the first step in developing your model is to determine the melting point or the freezing. Melting point (mp) analysis can also provide information about the purity of a sample it's not difficult to understand how impurities affect the melting point foreign substances in a crystalline solid disrupt the repeating pattern of forces that holds the solid together. Effect of additives on melting point and viscosity of rh refining slag xiaoping liang ,1 , yang jin 2 and yu wang 1 1 college of materials science and engineering, chongqing university, chongqing, 400044, china.
Re: melting point determination you can check this video that'll show you the basics of packing a capillary tube to be used for melting point quiz may be given regarding this re: list of unknowns for distillation experiment: methyl ethyl ketone, diethyl ether, hexane, ethyl. Procedure: melting point set-up packing the melting point tube: capillary tube seal at one end by heating pack the pulverize sample melting point process: heat ignition tube over low flame record temp ( when sample starts to liquefy) continue taking temp reading (until temp remains constant. Research: look up the definition of melting point hypothesis: which chocolate do you think will melt first materials: 1 bar of chocolate metric record the length of time the chocolate needs to start melting 6 repeat the process for each of the five other pieces wait five minutes between each. The alloy has the highest melting point - demonstrating clearly very different properties from its constituent metals this experiment can stand alone as a demonstration of how the properties of a metal can be changed by alloying, or you could follow it up by asking students to explain the results of the hardness testing in terms of the.
Expt #1 - melting point determinations general notes about this lab melting point determinations: 1 pure known compounds obtain the mps of commercial samples of urea all solid wastes from this experiment will be collected in one of the two waste beakers in the dispensing hood. Melting point and use the second tube to obtain an accurate melting point with a heating rate of no more than 3 chem 2423 melting point determination dr pahlavan. When very high melting points are desired in a piece of hardware, sometimes ceramics are used one example is during project pluto in the 1950s, when american scientists attempted to create a nuclear-powered ballistic missile with an unshielded, gigawatt-level reactor.
Experiment no 1 melting point and boiling point melting point temperature at which the solid and the liquid state of a substance exist in equilibrium with each other. Salicylic acid has the highest melting point between the rest of the sample with 1525-1571°c range and naphthalene has melted fastest as it melted at 758-806°c for the first part of the melting point experiment. Allow the temperature to rise fairly rapidly to within 15 to 20 degrees below the expected melting point of the sample place the beaker in a sand bath such that about 1/3 of the beaker is immersed then adjust the flame size so that the temperature rises no more than 2-3 degrees per minute just before. Also, in exp 3 you will identify your unknown by its melting point.