You will be giving a mixture containing iron, salt and sand. Your job is to figure out how we should separate these three components into their pure, uncombined forms. In order to successfully complete the lab, you must recover all three components. In other words, when you are done, I will need to see three piles: one iron, one salt, and one sand. Your first step is to write a procedure. No lab work may begin until this procedure is approved by your teacher. If you are wondering what supplies you may use, you may assume that any of your basic chemical supplies will be available. If you feel that you need some equipment not usually found in a lab, ask your teacher if such equipment would be made available. Lab #9: Periodic Table: “Families” Background: We continue our look at the patterns in the periodic table. In this activity, we will be observing chemical reactions to see if there are any patterns in when they occur. Materials: Well Plate Magnesium solution Calcium solution Barium solution Sodium carbonate solution (Na2CO3) Silver Nitrate (AgNO3) Chlorine solution Bromine solution Iodine solution Procedure: Part One: 1. Place several drops of each chemical (excluding silver nitrate and sodium carbonate) in your well plate. As you place each chemical in its well, make sure to mark the position of that chemical. 2. Add several drops of sodium carbonate to each of the chemicals. Records your observations in your periodic table “data table” by placing a dot in each block where a reaction occurred. In the space below, write down your general observations. In other words, if chlorine reacted with sodium carbonate, I would find the square on the periodic table that represents chlorine and I would place a dot in it.
Read through the procedure and explain how we determine the pressure of the gas inside the eudiometer. Data Table Lab #29: The Effect of Temperature on Vapor Pressure Procedure This lab will be done in groups of 4 to facilitate the number of large beakers needed. Obtain and wear goggles. CAUTION: The methanol used in this experiment is flammable. Avoid inhaling the vapors. Avoid contact with your skin or clothing. Be sure there are no open flames or sparks in the lab during this experiment. Prepare the temperature probe and gas pressure sensors in the following fashion: Plug the gas pressure sensor into CH 1 and the temperature probe into CH 2. Insert the rubber stopper assembly into a 125 ml Erlenmeyer flask. Make sure the rubber stopper is on tight. Press the APPS button on your calculator. Choose Easy Data or DATA MATE. The temperature and pressure readings should be displayed. In this experiment we will be measuring the vapor pressure in the flask at four different temperatures to see how temperature affects our vapor pressure. For each of the four temperature ranges follow these steps. Draw 3ml of methanol up into the syringe. With the two way valve CLOSED, screw the syringe onto the two way valve. Open the 2 way valve and push the plunger so that all of the methanol goes into the flask. Quickly pull the plunger back to the 3 ml mark on the syringe and then close the 2 way valve. Remove the syringe. Using a mixture of ice and tap water, in a 600 ml beaker, prepare a water bath whose temperature is in the range of 0 to 5°C. Place the temperature probe in the water bath. Place the flask into the water bath and hold it so that the majority of the flask is submerged. (Do not allow the water level above the stopper.) Wait at least five minutes so that the temperature inside the flask can reach the same temperature as the water bath.