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Name: _____________________________ Block: ____ Date: ___________________________ CONDUCTIVITY AS INDICATOR OF BOND TYPE ACTIVITY Directions: 1) The bench with the set-up for this activity contains a cell well plate. Please refer to the chart at the bench that describes the contents of each cell. CAUTION: Some people are allergic to sulfur. There is no need to touch it directly with your hands. 2) Place the conductivity tester in each well to determine if the material is an electrolyte (conducts electricity). Depending on the type of tester being used, you will either hear a beep or see a light turn on. MAKE SURE TO DIP THE TESTER IN THE DISTILLED WATER AT THE BENCH BETWEEN EVERY TEST TO CLEAN THE PROBES. 3) Record your results in the table below and interpret them to determine the type of bonding. Substance Chalk Graphite Sugar Sulfur Sodium sulfate Tin Vinegar Pure H2O Tap Water Conductivity Conductivity in H2O Type of Bonding n/a n/a n/a USEFUL INFORMATION: Chalk is mostly CaCO3 and dissolves only slightly in water Sulfur is a yellow molecular substance, arranged in S8 ring molecules Sodium sulfate is white and dissolves in water Tin is a metal Graphite is a form of carbon. The atoms are bonded to each other in systematic sheets with some free electrons holding the sheets together. Distilled or deionized water can be considered pure H2O. Tap water contains many dissolved impurities that are molecular and ionic. EXTENSION: Predict the conductivities of each of the materials listed below, and give reasons for your predictions using data from the activity. How would the conductivity of each material be affected if water were added to it? Please write your answers below the questions. a. An iron nail b. Liquid bromine, Br2 c. Wax (a random arrangement of molecules with long, nonpolar chains of carbon and hydrogen atoms) d. A dilute hydrochloric acid solution, HCl (aq) e. Table salt, NaCl