Which Liquids Conduct?

Some complete circuit much better than others. Ask students to predict what will happen. Test liquids with same electrodes. Key idea: Mobile ions carry electric current through solutions. Ask: Why does dissolved salt conduct but sugar may not? Safety and cleanup: Low voltage only; rinse electrodes. https://www.google.com/search?q=%22Which+Liquids+Conduct%3F%22+science+demonstration+experiment