CHEM 2510 Laboratory Report: Recrystallization and Melting Points Cover Page: Recrystallization and Melting Points by Lab Instructor: January 28‚ 2014 Purpose: The purpose of this experiment was to recrystallize a 95% pure sample of benzoic acid contaminated with approximately 5% salicylic acid using two different methods to determine the melting points and discover the impurities of the substance.
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Freezing Point of Naphthalene I. Purpose To determine the freezing point of a known substance‚ naphthalene II. Materials ringstand gas source test tube test tube clamps thermometer naphthalene Bunsen burner goggles hose stopwatch III. Procedure 1. Assemble the Bunsen burner‚ attaching one end of the hose to the burner and the other to a gas source. 2. Assemble the ring stand so that a ring clamp is attached to the stand holding the test
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In the process of boundaries being created the markers for these are called lines and corner points. Lines are invisible or distinctive such as a tree line creek or even a fence that was put up that would connect two corner points or terminal points. A corner point can also be along the line of there is a third party involved with that line. The corner points do not have to be on the line in its self but must have a distinctive description on exactly how it will be found. These corners are usually
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crystals. In selecting a solvent consider that like likes like. Polar compounds dissolve polar compounds and non-polar compounds dissolve non-polar compounds. Solvent will dissolve a large amount of the impure compound at temperatures near the boiling point of the solvent the compound would be completely insoluble in that solvent at room temperature or at zero oC 2. Impure benzoic acid was dissolved in hot water. The container of solution was placed in an ice-water bath instead of being allowed cooling
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Toxicology Lab 1. In this investigation‚ a wide range of concentrations of Sodium Chloride (NaCl) solution were created and the effects that they had on radish seeds were tested. This ultimately created a doseresponse experiment in which it was detectable whether or not radish seeds were a reliable bioassay for the toxicity of NaCl. The goal of this experiment was to determine a correlation between toxicity and seed germination/radicle
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Physical and Chemical Change Objective: Recognize and distinguish between chemical and physical changes. Materials: - lab balance - microspatula - lab burner - dropper pipet - 5 test tubes - mortar and pestle - test tube rack - magnet - test tube holder - insulating pad - watch glass - safety goggles - glass square - lab apron or coat - copper sulfate pentahydrate - iron fillings - sodium chloride - magnesium ribbon - hydrochloric acid - paper
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nail gave off constant “streaks” of a blue/green color. The steel screw had constant “streaks” of yellow as well as many‚ many tiny bubbles the entire time. The nail also got much more dark after the salt solution. Part 2: Observations for the melting of sugar: Almost immediately the sugar began to melt. At first the sugar just turned from a pure‚ solid white to a white sugar that almost looked like more of a liquid. Then the sugar began to “pop” into tiny bubbles and quickly got faster. The
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of "The Mosaic". No other country in the world encompasses inhabitants from so many different backgrounds who exhibit strong loyalty towards Canada‚ while still preserving their cultural heritage. This is contrasted to the American ideal of the "Melting Pot"‚ which attempts to shape all of their citizens into a set mold. Canada’s philosophy is believed to be more effective and respectful than that which is possessed by our American neighbours. The following will discuss the advantages and disadvantages
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be affordable‚ an addition to my Fish tank‚ and Get along with all six Angelfish. Live in water temperatures of 78-82 degrees Fahrenheit‚ and not make a mess in the tank or destroy the vegetation already living in the aquarium. I have set up a point by point arrangement to help me select the best algae eater for my tank. The Chinese algae eater Price Size Life Span Characteristic Tank Mates Temp. Range Waste $2 - $8 11in. - 1ft 3– 5years Docile as a juvenile /territorial as it mature
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African Diaspora and the World After reading the short story “Diaspora” by Joanne Hyppolite‚ I got a vivid understanding of how diaspora can have an effect on one’s identity. Over the past month we have studied many theories and concepts concerning race‚ gender‚ and politics. There are three theories that capture the essence of Joanne Hyppolite’s worldview as a Haitian growing up in America: intersectionality‚ identity‚ and diaspora. Individuals oftentimes experience the theory of Intersectionality
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