Chem 111 Lab 3 Castle of Quantification

Chem 111 Lab 3 Castle of Quantification - The Castle of...

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The Castle of Quantification 1 Cornerstone Chemistry The Castle of Quantification A major development in the discovery of Nature’s Chemical Laws was the use of the balance during experiments. By quantifying the mass of reactants and products, chemists uncovered regularities and created new generalizations about the physical world. These generalizations are important to us today. For instance, in industry the optimization of product is often extremely important economically. By knowing the relationship between reactants and products, chemists can predict how much product will be made from the amount of reactants they started out with; this minimizes the quantity of wasted reactants and thereby increases efficiency of the manufacturing process. Your job is to find this relationship.
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2 The Castle of Quantification Cornerstone Chemistry FOCUS QUESTION Is Mass Conserved in the Chemical Reaction you studied in Lab? First, Last and Always Safe Handling: 1. Iodine is a moderately corrosive substance and will stain the hands so do not pick up pieces if spilled; always use a dust pan. Iodine stains of the skin can be removed with a solution of sodium thiosulfate which will be supplied in the lab. If you notice any stains on your body or clothes outside lab, apply rubbing alcohol to the area and rinse off with water. Clean off any spatulas which have come into contact with iodine. If you ever observe the formation of a purple gas, immediately remove the vessel to the hood. Disposal 1. Solid zinc does not go down the drain nor does any extra iodine. They will be collected in waste beakers. A Pre-Lab Checklist Review Tool 7; Read Tool 8 and 13. Summarize or Flow Diagram Procedure. Hand in Summary The Details: 1. The procedure of this activity is very similar to Redox Arena except that you are not conducting chemical tests to identify your products. Instead you are using the balance to quantify your reactants as well as your products.
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The Castle of Quantification 3 Cornerstone Chemistry 2. Acquire a boiling tube and dry it inside as well as outside with a paper towel. Use a grease pencil to label it “R” for reactants. Do not use a paper label; if the labels are burned off during the heating process then your mass values will not be consistent. Tare (zero-out) an electronic balance (use a triple beam balance if there are no electronic ones available). Weigh the “R” tube on the balance and record its mass in your notebook. (you should be able to read to two decimal places with the balances we have in the lab). Place the boiling tube into a beaker to secure it since it won’t fit into a regular test tube rack. 3. Each group should complete the following seven different experiments. Divide the labor as your group sees fit. EXPERIMENT
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This note was uploaded on 02/13/2011 for the course CHEM 111 taught by Professor Bastos during the Spring '08 term at CUNY Hunter.

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Chem 111 Lab 3 Castle of Quantification - The Castle of...

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