CHEM 221 MIDTERM EXAM QUESTIONS AND ANSWERS WELL ELABORATED

oxidizing agent - Correct Answers loss of electrons accept electrons from another substance and becomes reduced reducing agent - Correct Answers gives electrons to another substance and becomes oxidized electric current - Correct Answers quantity of charge flowing each second through a circuit salt bridge - Correct Answers u-shaped tube filled with gel containing kno3 prevents charge build up in each half cell potentiometry - Correct Answers electrode potential depends on activity/conc of an electroactive species uses a galvanic cell to determine conc indicator electrode - Correct Answersresponds to changes in activity of the analyte reference electrode - Correct Answersconstant potential different types of indicator electrodes - Correct Answers metal electrodes ion-selective electrodes metal electrodes - Correct Answers develop electric potential in response to redox at metal surface ion-selective electrodes - Correct Answers develop electric potential in response to migration of a one type of ions possesses a thin membrane that acts as a selective barrier glass electrode - Correct Answers membrane is made of thin glass and is sensitive to H ions hydrated gel layer - Correct Answers exchange site of a glass electrode errors in pH measurements with glass electrodes - Correct Answers standards junction potential junction potential drift - Correct Answers caused for example