Identifying bond type with physical properties

Purpose: To determine the type of bonding in some unknown substances using smallest number of tests.

Materials:

goggles

7 test tubes

test tube rack

test tube holder

conductivity apparatus

DI water

stir rods

scapulas

well plate

Bunsen burner

dilute HCl

Beaker

plastic wash bottle

marking pen

7 unknown substance

conductivity meter

Procedure: 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.

Test tubes

Destillasjon av tre

A Bunsen burner with needle valve. The hose barb f...

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...