Can you rewrite the following procedure in a chronological, numbered list?

Part I. Determining the Molecular Weight of an Unknown Compound -- Preparing the apparatus

Rinse the temperature probe with acetone and wipe with a paper towel to be sure it is dry. Assemble your apparatus as shown in the figure on the In-Lab page. A 16x150 mm test tube will be provided for you. The test tube must be clean and dry! Insert the stopper with the temperature probe and wire stirrer into the test tube. The stopper should not extend further than halfway into the test tube. If it can be inserted further than halfway, you are using the wrong size test tube. Be sure that the temperature probe is pushed down as far as possible, and that it does not touch the sides or bottom of the test tube. Set the test tube in a test tube rack.

Part I.A. Measuring the freezing point of the solvent (Caution! Cyclohexane is a flammable solvent)

From the dispensing bottle, carefully dispense 12.0 mL of cyclohexane into the 16x150 mm test tube. Raise the piston of the bottletop dispenser slowly and evenly to the stop to fill the dispenser, then press down slowly and evenly to discharge the liquid into the test tube. Calculate the mass of cyclohexane that was dispensed (C6H12, density = 0.779 g/mL). Place the stopper with the temperature probe and stirrer in the test tube and set the test tube in the rack. Be sure that the wire stirrer moves freely in the test tube and that the tip of the probe is in the center of the volume of liquid.

Fill the largest beaker from your drawer about one-third full of water and add ice until the beaker is three-fourths full. When you are ready, click on the green arrow button, and the computer will begin to collect temperature readings. Move the test tube from the rack into the ice-water bath and hold it such that the level of liquid in the test tube is below the level of water in the bath. Immediately begin stirring the liquid continuously and at a constant rate until the liquid has solidified. Once freezing begins, as long as liquid and solid are both present, the temperature will remain constant until the entire mass has solidified. Agitation will prevent the supercooling that occurs just before crystals appear. Allow the computer to continue recording the temperature until the plot has leveled off at a constant temperature (see Figure 1a on the Pre- Lab page). Note: Once the cyclohexane has frozen solid, the temperature will start to decrease again.

When you have collected a sufficient amount of data, click on the red button. Remove the test tube from the ice-water bath and let it warm up to room temperature. Save your data, adjust the graph parameters and title, and then print it (see instructions on the In-Lab page).

Part I.B. Measuring the freezing point of the solution

Obtain from your instructor an unknown compound in a test tube and record its number. Accurately weigh about 0.14 g of this solid material onto a piece of weighing paper. The cyclohexane contained in the test tube should have re-melted by this time. Remove the stopper from the test tube and carefully add the unknown sample to the cyclohexane while avoiding the loss of any compound adhering to the sides of the test tube or stopper. Replace the stopper and re-weigh the paper to account for any crystals which remain on it. Return the test tube that contains unknown compound to your instructor.

Stir the solution in order to dissolve the solid. If necessary, place the test tube in warm water from the tap to aid in dissolving the solute. It is important that no crystals remain. Do not use a hot plate or light a Bunsen burner! Cyclohexane is flammable!

Make up a new ice-water bath, if necessary. When you are ready, click on the green button. Place the test tube in the ice-water bath, as in Part I.A., and stir the solution continuously and at a constant rate. The temperature will not remain entirely constant as the solution freezes. The freezing point of the solution, however, is the point at which it first begins to freeze and is indicated graphically by a change in the slope of the temperature-time curve (see Figure 1b on the Pre-Lab page). You will need to collect data for 300-500 seconds in order to see this clearly.

When you have finished collecting data, click on the red button. Follow the procedures to save, adjust, title and print your plot (see instructions on the In-Lab page).

Do not pour any cyclohexane or unknown compound into the sink. Pour the liquid mixture into the Laboratory Byproducts Jar provided by your instructor, then rinse your test tube and temperature probe with acetone to remove the last traces of any crystals, pouring the rinses in the Byproducts jar.

Part II. Comparison of Covalent and Ionic Compounds

Weigh 1.0 g of urea onto weighing paper. Place approximately 20 g of ice in a 150 mL beaker, and then add 10 mL of deionized water. Record the total mass of ice and water.

Place the temperature probe in the ice-water slush, and when you are ready, click on the green button. Using the temperature probe, stir the slush continuously for 1-2 minutes. Add the 1.0 g of urea to the slush and continue to stir for another 4-5 minutes. Click on the red button to stop the data collection. Save the data file, then choose Store Latest Run under the Experiment menu.

Weigh 1.0 g of sodium chloride onto weighing paper. Pour the contents of the 150 mL beaker into the sink, then rinse the beaker and temperature probe thoroughly with water. Weigh 20 g of ice into the beaker and add enough water such that the total mass equals the total mass of ice and water used above.

Place the temperature probe in the slush, click on the green button, and stir the slush for 1-2 minutes. Add the 1.0 g of sodium chloride to the slush and continue to stir for 4-5 minutes. Click on the red button. Save the data, then choose Store Latest Run under the Experiment menu. Print the graph with the urea and sodium chloride plots displayed simultaneously. Indicate on the printout which plot corresponds to which solid.

Pour the contents of the 150 mL beaker into the sink, then rinse the beaker and temperature probe thoroughly with water.