The total points for this activity are then 49, which can be rounded to 50. The column for reaction with acid is not graded because the bubbles of gas are sometimes very difficult to observe. Evaluation of the classification should be done based on the student observations, not necessarily on what the sample actually is. The reason is that the students are to classify based on their own experimental data, which may or may not be correct. Back to Top Evaluating Electrolytes Metals are not the only substances that conduct electricity.
Electrolytes also conduct electricity and are essential to the proper functioning of our bodies.
Discuss with students what an electrolyte is. Have students use a conductivity apparatus to investigate the following solutions and determine if they are a strong electrolyte, weak electrolyte, or nonelectrolyte. The solutions are salt water, sugar water, rubbing alcohol, tap water, and distilled water. Have them make a prediction based on the chemical formula of the solution and then check their hypothesis. Once they have checked these solutions, they may want to test bottled spring water or a few sports drinks to see if they are strong electrolytes, weak electrolytes, or nonelectrolytes.