Lab 1211 Practical Exam Questions
Test Administration 1. Each student will have exactly 50 minutes to complete a laboratory experiment to answer a specific question. Students will have an additional 10 minutes to clean up their work area, return equipment to the appropriate place, and to dispose of chemical waste. 2. Twelve students at a time will take the exam. Your TA will decide which 12 students take the exam each hour during the lab period. 3. Upon entering the lab, the TA will shuffle 12 sheets of paper identifying the experiments to be performed. Each student will select one, and only one, sheet of paper that tells them the experiment he or she will perform. Students will perform that experiment, they will not be permitted to select a different experiment for any reason, nor can they exchange experiment sheets with other students. 4. Students will work individually when performing this experiment. You will not be permitted to speak to, or ask questions of anyone during the experiment. Your TA may only answer questions involving safety issues and where to dispose of chemical waste. You will not be permitted to use your lab manual or any other materials when performing this experiment. 5. You are permitted to bring a TI 30 calculator and a pencil to the examination. 6. After the exam, you are forbidden to speak to other students about the exam. YOU ARE NOT permitted to post any comments, questions, or statements about the exam on WebCT before, during, or after the exam is over. Students that fail to obey these rules will be in violation of the University Honor Code and will be dealt with through the Academic Dishonesty Program through the Vice President for Instructions Office. 7. The exam is worth 10 points (10% of your lab grade). The experiment will be graded as either right or wrong. You will receive 10 points a for correct answer, you will receive 0 points for an incorrect answer. These are the only two possible grades you will receive. 8. After your experiment is completed, answer the question on the sheet, submit it to your TA, and you may leave the lab. DO NOT ASK your TA if you got the question right or wrong. Your TA is forbidden to answer any questions about the lab final until all students have finished the exam. Your TA will not know the correct answers to the exams until after all students have completed the exam. You will be given all information and chemicals required to perform the following experiments. You do not need to memorize any tables of values. List of Possible Exam Questions 1. Determine the density (numerical value) of a solid and an unknown liquid. 2. Determine the calorimeter constant (J/C) for a styrofoam cup calorimeter. 3. Determine the specific heat of an unknown metal. You will be given the calorimeter constant. 4. Determine the identity of an unknown metal nitrate solution by titration with NaOH. 5. Determination of the concentration of an unknown metal solution by absorbance spectroscopy. You will be provided a Beers Law plot. You do not have to make standard solutions. 6. Determine whether two unknown compounds are ionic, polar covalent, or nonpolar covalent. 7. Standardize (determine the concentration) an unknown acid via titration.
8. Standardize (determine the concentration) an unknown base via titration. 9. Determination of the percent mass of sodium carbonate (Na2CO3) in an unknown mixture by itration by titration with a 1.00 M acid solution. 1mol of the Na2CO3 mixture reacts with 2 moles of acid. 10. Determination of the percent mass of potassium hydrogen phthalate (KHP) in an unknown mixture by titration with a 1.00 M base solution. 1mol of the KHP reacts with 1 mole of base.