Identifying Bond Type With Physical Properties

1118 words - 4 pages

Purpose: To determine the type of bonding in some unknown substances using smallest number of tests.Materials:goggles7 test tubestest tube racktest tube holderconductivity apparatusDI waterstir rodsscapulaswell plateBunsen burnerdilute HClBeakerplastic wash bottlemarking pen7 unknown substanceconductivity meterProcedure: Step #1) Mark all seven test tubes from A through G.Step #2) Place your first unknown substance into the test tubes according to the letter that matches.Step #3) Observe the physical appearance of the unknown substance. Record your observation.Step #4) Set up the bunsen burner and light the bunsen burner.Step #5) Adjust the flame so the hot spot, top of inner blue cone, is visible.Step #6) Bunsen burner's hot spot reaches about 800¢ªC. Grip the test tube with the test tube holder near the upper end of the test tube. Place the test tube on the tip of the hot spot in an angle and gently shake that test tube as it is being heated. Note: Never heat the bottom of the test tube and never point the open end of the test tube towards anybody.Step #7) Observe and see if the substance melt. Record your observation.Step #8) Poor some deionized water into a beaker then place the substance into the beaker as well. If the substance melted from the previous step, then get some more of the substance, and if not then use the one you got. Stir and observe if it forms aqueous solution. Record your observation.Step #9) If it creates a solution, then check to see if it conducts electricity in solution with the conductivity meter. Record your observation.Step #10) At this point, if you can't determine what kind of bond the substance has, then go do one of the last two tests: Conductivity of solid or Action of dilute HCl. They are both a process to find if the substance is a metal or not.------------------------------------For Conductivity of solid------------------------------------Step #11) Get more sample of the substance then observe if it conducts electricity in solid state with the conductivity meter. Record your observation.Step #12) Finally conclude what type of bond the substance has.---------------------------------------For Action of Dilute---------------------------------------Step #11) Get more sample of the substance and place it in a clean test tube.Step #12) Put few drops of HCl and observe if the substance reacts. Record your observation.Step #13) Finally conclude what type of bond the substance has.-------------------------------------------------------------------------------------------------------Repeat the process for all of the unknown substance.Observation Table*DiscussionThe substance A was fine white grains. We lit the bunsen burner and adjusted the burner to have the hot spot, top of inner blue cone, then we placed the test tube with the substance A over the tip. It didn't melt. To me it seems like it was getting harder and more brittle. Then we put it into deionized water to see if it formed aqueous solution. It was...

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