Purpose and Summary The purpose of this lab was for students to practice identifying substances using limited information. In this particular lab, the mass, number of moles, and number of particles were given. From this lab, students can also understand the concepts of moles and the relationships between moles and molar mass. Each group was given a bag, either from Set A or Set B, that held an unknown substance. After the group identified the substance, they had to solve a bag from the different set. The bags also had information for clues: Bag A had the mass of the empty bag and the number of moles, and Bag B had the mass of the empty bag and the number of particles listed. Answers A6 is Sodium Chloride. B6 is Zinc Oxide. Determining the Identity My partner and I first recieved the bag B6 from Set B. We started off by first weighin...
Summary In this lab, students were given many different substances to hold over a flame and were asked to observe the colors of the flame produced. This helped demonstrate the relationships of the flame colors and the certain atoms contained in compounds. Pre-lab Questions 1) What is the difference between ground state and an excited state? Ground state is the most stable state where all the electrons are in the lowest energy levels. On the other hand, an excited state is where the electrons are in an unstable arrangement, and will go back to their normal positions of lower energy. 2) What does the word "emit" mean? The word "emit" means to "produce and discharge", especially in gas or radiation. 3) In this experiment, where are the atoms getting their excess energy from? In this experiment, the atoms are getting their excess energy from the heat of the bunson burner's flame, where the electrons can reach an excited state. 4) Why do ...
Summary In this lab, students were given the task of finding the percent ionization of the acetic acid, CH3CO2H, in vinegar. Students would slowly add in sodium hydroxide, a base, into the acetic acid until it was neutralized, and showed a pale pink. Materials included a funnel, a burette, beakers, a hot plate, an Erlenmeyer flask, a graduated cylinder, a pippette, and a magnetic stir bar. Data Percent Ionization of Vinegar Our percent ionization of vinegar is 0.45% . This is such a low number because it is a weak acid, so the molecules doesn't seperate easily, and so not all of them split into ions. Photos Our setup Trial #1 Analyte (Failed) Trial #2 Analyte at Equivalence Point
Comments
Post a Comment