University of Washington CHEM 152 Prelab 5 -All Answers are Correct

Chem 152 Prelab 5 Due Nov 30 at 8am Points 5 Questions 4 Available Nov 16 at 8am ­ Nov 30 at 8am 14 days Time Limit None Allowed Attempts 2 Instrucons This quiz was locked Nov 30 at 8am. Aempt History Attempt Time Score LATEST Attempt 1 3 minutes 5 out of 5 Í Correct answers are hidden. Score for this attempt: 5 out of 5 Submitted Nov 29 at 11:58am This attempt took 3 minutes. Before working on this prelab assignment, carefully read through the introductory information and procedure for THIS experiment, which can be found in the laboratory manual. You will have only two opportunities to submit answers for this assignment, so work carefully and be sure you have checked your work BEFORE clicking the "submit" button. You must submit your answers before the assignment closes. If you do not earn a score 0 or do not submit your responses at all, 15 points will be deducted from your overall lab score at the end of the quarter. Ques 1.5 / 1.5 pts tion 1 What is the appropriate waste disposal method for the liquid waste collected in your 1­L waste bottle throughout the experiment? One of the answer choices below is correct...select the one correct answer. Ques 1 / 1 pts tion 2 Calculate the volume (in mL) of 0.00500 M KCl solution that needs to be added to a 50.0 mL volumetric flask and diluted with deionized (DI) water in order to prepare a calibration standard solution with a concentration of 1.50 x 10 M KCl. As part of your preparation for performing this experiment, repeat this calculation for each of the calibration standards you will need to prepare and record the information in your lab notebook so that you have it ready during the lab session. ­4 0.75 mL 1.00 mL 1.25 mL 1.50 mL 2.00 mL Ques 1 / 1 pts tion 3 The equilibrium constant K for a certain reaction was measured as a function of temperature (in Kelvin). A plot of ln(K) versus 1/T for this reaction gives a straight line with a slope of 1.352 x 10 K and a y­intercept of ­14.51. Determine the value of ΔH° for this reaction. 4 ­120.6 kJ/mol ­164.7 kJ/mol ­112.4 kJ/mol ­176.7 kJ/mol Ques 1.5 / 1.5 pts tion 4 Which of the following are potential safety concerns for this lab? Three of the answer choices below are correct...select the three correct answers.