Lab 3 - Castle of Quantification

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. Save your white zinc iodide product in your plastic bag containing desiccant since you will analyze this substance in the following weeks. 2. Solid zinc does not go down the drain nor does any extra iodine. They will be collected in waste beakers. 3. The following labeled beakers should be used to collect your lab waste. Iodine Zinc Metal Waste Waste
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The Castle of Quantification 3 Cornerstone Chemistry A Pre-Lab Checklist Read Tool Boxes 7a & 8. Summarize or Flow Diagram Procedure. Make Photocopy of Summary to hand in. The Details: 1. Organize yourselves into groups of 5 to 7 students. The purpose of this is to work as a team and share data. 2. The procedure of this activity is very similar to activity 1 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. 3. Acquire a boiling tube and dry it inside as well as outside with a paper towel. Tare (zero-out) an electronic balance (use a triple beam balance if there are no electronic ones available). Tare a beaker to hold the boiling tube. Place a dry boiling tube on the balance and record its mass to two decimal places. Do not label this test tube nor any others in this activity; if the labels are burned off during the heating process then your mass values will not be consistent. 4. Each group should complete the following seven different experiments. Divide the labor as
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This note was uploaded on 09/21/2011 for the course UNKNOWN 111 taught by Professor Lessie during the Spring '11 term at ASU.

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

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