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Chemistry Lab

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Chemistry Lab: Classification of Crystalline Solids

SCH 4U
Domenic Colantonio

Teacher: Ms. Chisholm Due Date: Tuesday, November 24th, 2015
Purpose: To design a lab investigation in order to identify several types of crystalline solids To Observer and Analyze the physical properties of several types of crystalline solids To Determine the types of bonding present between the building blocks of several types of crystalline solids

Materials: Non-Polar Molecular Solids Ionic Solids Network Crystals Polar Molecular Solids Metallic Solid Deflagerating Spoon Test Tubes Test Tube Rack Electronic Scale Scoopula Bunsen Burner Conductivity Tester Distilled Water Hexane Plastic dishes Stopwatch Distilled Water Graduated Cylinder Test Tube Plugs

Safety: Ensure Hexane is always used under the fume hood and that it does not come into proximity with any open flames. Dispose of all chemicals/solutions in appropriate garbage/sink.

Procedure: Physical Properties * A) Hardness and Texture/Smell/Conductivity(s)/Melting Point 1. Measure out 1 gram of each substance using an electronic scale 2. Use the scoopula to note on the hardness and texture of the substance 3. Waft over the substance to note odour 4. Using the conductivity tester, test the conductivity of the solid substance and note 5. Prepare a Bunsen burner, away from any flammable substances, with a dark blue flame containing a lighter, inner, blue flame 6. Using a deflagrating spoon, put substance over the tip of the inner flame, and using the stopwatch, note on how long it takes the substance to melt 7. Note: If melting time is over 60 seconds, simply note >60 seconds 8. Dispose of chemical in proper sink 9. Repeat for remaining 5 unknown substances

B) Solubility in H2O/Conductivity in H2O 1. Using an electronic scale, measure out 1 gram of each substance 2. Using a graduated cylinder, measure 20mL of distilled water into a test tube 3. Using a scoopula, accurately mix 0.5 grams of substance A into the test tube 4. Apply the proper test tube stopper and shake for 30 seconds 5. Note on the solubility of the substance 6. Using a conductivity tester, properly test the conductivity of the aqueous solution 7. Note the conductivity and dispose of substance in proper chemical disposal sink 8. Repeat for remaining 5 substances C) Solubility in Hexane 1. Under the fume hood, using a graduated cylinder, measure 15mL of Hexane into a test tube 2. Using the remaining resources from step B), put the remaining amount of substance A (0.5 grams) into a test tube and apply a stopper 3. Shake for 30 seconds and note the solubility of the substance 4. Safely dispose of all solutions in proper sink, and keep away from open flames 5. Repeat for remaining 5 substances Conclusion: The purpose of the lab investigation, titled “Classification of Crystalline Solids,” was to successfully design a lab where the specific bonds within a crystalline solid were identified through analysis of its physical properties.

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