"Chemical Substance" Essays and Research Papers

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Solids: Recrystallization and Melting Points

Parts 1-3. Part 1: Melting points of Urea and Cinnamic Acid. Part 2: Melting point of unknown. Part 3: Melting point of Mixture- Urea and Cinnamic Acid (take melting points of mixtures in 1:4, 1:1 and 4:1 ratios). Reactions Main Reaction: Not a chemical reaction but a physical reaction. Urea in solid mixed with water melts when heated. Then through filtration and drying, the liquid mixture yields the pure Urea. This is the same main reaction for Cinnamic Acid, mixtures, and the unknown compound...

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Good Student Sand Salt Lab Report

paper. Filter paper has tiny holes allowing only liquid to pass through and solid particles to stay on the paper. Evaporation is effective in separating particles in solutions. The solution is heated so that the solvent will evaporate, and the solid substance is left behind. Conclusion: The objective of the experiment was to separate a mixture of sand and salt. Through using given materials, and following the procedure, the objective was met. The mixture can be separated into sand and salt through filtration...

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Atdp Course

the method of analysis of separating and comparing dyes used in candies and food coloring. It is also a proven method to analyze candy and its complex structure, without having to taste it. These complex mixtures can be separated back into pure substances. To find out the ingredients of a favorite candy, chromatography would help to define every ingredient found in the candy sample. The word chromatography is derived from the two Greek words, “Chroma” meaning color and “graphic” meaning to write...

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mateo, Isabela (name) Abstract Most of us spend about 90%of our time indoors, so minimizing the use of harmful chemicals in our homes, offices and schools is important to keep the air we breathe healthy and constructed surfaces we live on free of irritants and toxins. Besides being expensive, store-brought cleaners contain a number of chemicals. These chemicals can be hazardous to our health and are not necessary to have a clean home. Making our own household cleaners saves money and...

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Dental Impressions

closely to the hard and soft tissues. Hydrophillic materials will prevent airblows from forming in the presence of moisture and remove the need for a dry field. Dimensional accuracy and stability: impression materails set by either physical or chemical reaction and may shrink or expand during this process affecting the accuracy of the cast produced. Some materials are also prone to change in dimension due to thermal contraction during cooling from the mouth to room temperature and in the period...

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Chemistry in Our Life

makeup and soap. Each time you bath you are witnessing chemistry at work. Chemicals such as acetyl alcohol and Propylene glycol are typical ingredients in the soap used to wash your hair and skin. Without chemistry these materials (or combinations of these materials) might be hazardous or might not exist. The chemical colouring agents used in makeup and nail polish would not be possible without an understanding of the chemicals involved. Almost anything you do during the course of a normal day involves...

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widely used operation for purifying organic solids that differ in their solubility at different temperature. The objectives of this experiment are to purify an impure solid, and calculate its percentage yield. It is a way of effective recovery of a substance mixed with another to produce a pure compound. With their differences in solubility you can separate them by dissolving the mixture then filter out the impurities in the process. In this experiment, aniline is the primary compound used to acquire...

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Quantitative Separation Techniques of a Mixture of C10H8, Nacl and Sio2

variety of techniques such as sublimation, selective dissolution, filtration or evaporation. As a result, the mixture contained 9.51% of C10H8, 16.2% of NaCl, and 60.40% SiO2. Introduction A mixture is a combination of two or more pure substances in which each substance retains its own composition and properties. One easily recognized type of mixture is called a heterogenous mixture. Its portions contain different recognizable properties and are not uniform throughout the mixture. Another kind of mixture...

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Preparation of Bromotriphenylmethane

positioning of the side chain. The reaction is as follows: Finally purification of the structure of the unknown oxidized component, its structure shall be determined by obtaining the melting point and by means of IR spectroscopy of the original substance. Experimental The experiment was carried out following the procedure described in Experiment 24 of the assigned lab book (Lehman 188-195) with some deviation: When it was time to use the condenser the first time around, the tubes for the water...

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Separating Homogeneous Mixtures

is known that sodium chloride dissolves in water, water was used to dissolve the NaCl. Along with separating the components of a heterogeneous mixture, the percent recovery of each substance was calculated using the formula: % recovery = (final mass)/(inital mass) x 100. The percent recovery is the amount of substance that was recovered from before the experiment to after the experiment. Overall, in this laboratory experiment, differences in solubility could help to separate the difference components...

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