Lab Essay Research Paper Introduction The

Lab Essay, Research Paper

Introduction: The purpose of this lab was to introduce a basic scientific method of a chemistry experiment. Approaches of procedural, experimental, and observational methods were explained and introduced to the class. For this lab a “system” was given to identify. Three goals were trying to be accomplished: What the “system” does, what it did, then tell how this was solved after observing it. When writing this lab these principals were to be demonstrated. A hypothesis was made to try to identify the three main goals. The hypothesis made for the “system” was that there are two liquids inside the test tube and if altered will cause a chemical change resulted by the creation of bubbles. Methods: This lab was taken place in Mr. Pierre Bouthyette’s laboratory in room 112 on Tuesday, September 8th. The time the lab was started was 3:13pm. After placing all work materials down at a lab station a “system” was removed from a test tube holder located in the hood at the front of the room. The “system” was brought back and placed down on the lab counter where working materials were. A pair of lab goggles were retrieved by students and placed over their eyes for protection from the “system” if spilt. The first thing that was done was to record all observations of the “system” without touching it or doing anything to it. There were questions that were to be answered such as ” What was the solution standing on.” What did the “system” look like.” “What was the shape of the “system.” Goals were made to try to solve the hypothesis made by the observer. “What would happen if the “system” was heated.” “What would happen if the “system” was cooled.” ” What would happen if the “system” was shaken.” ” Would the “system” change if the test tube was opened.” All of these questions were answered by testing them in a scientific manner. Procedure: Anything could be done to the system as long as the observer realized that it could possibly alter the “system.” All procedures were to be made in a scientific manner, recording all data and recording all timed events. First the “system” was observed without touching it, all data was recorded and a time was recorded. Then it was picked up and lightly shaken, any changing of the “system” was recorded as well as the time. By shaking the “system” it was moved in a vertical motion by one finger placed on the cap and the other fingers placed along the side of the test tube. The “system” was then shaken a bit harder and observation were noted. To be real scientific a standard shake was made and a graph was created to demonstrate change in the “system.” The number of shakes verses the amount of time taken were plotted. If there was a change in color to the “system”, then a graph was plotted to show the intensity of color verses the amount of shakes made. All data was recorded in this procedure. A general time was taken to show how much time had passed since the experiment started. Next, the sound of the “system” was recorded by way of taking a pencil to it and tapping. Then, the system was shaken and the pencil was tapped against it again. The sound was once again recorded. Now the “system” was subjecting to a method of cooling. An ice bath was made by taking 50% ice, 50% water and placing it into a Styrofoam container. The test tube supporting the “system” was placed into the bath, bottom going in first. Time was recorded for how long it stayed in. All changes, if any, were recorded in a data log. After the “system” was taken out, test were made to it. It was shaken to see if there were any physical changes that might be different since it was cooled. Comparisons and contrasts were made from results that were recorded earlier. Next, the “system” was placed into a boiling beaker of water that was on a hot plate. Using test tube tongs, the “system” was held into the water for two minutes, then removed. Any changes in physical appearance were recorded. Other tests were performed to note changes. The test tube was shaken again, and data was recorded. These results were compared and contrasted with earlier data. Then it was time to open the “system” and expose it to the air. The cap was twisted off and dried with a paper towel. The top of the test tube was dried as well. With a wafting motion, the “system’s” odor was observed then recorded. To see if there were any changes that would alter from exposing the “system” to the air other tests were made. The cap was placed back on and it was shaken again. Observations were made and recorded. The “system’s” volume was then changed. Measuring it with a graduated cylinder the volume was recorded. Next, water was added, being the same volume of the “system.” Thus, it became doubled. It was observed and data was recorded. The “system” was shaken again and results were recorded.

Results: The time the experiments started was ( 3:05 ) The “system” was a yellowish colored liquid that had small particles floating around inside. Most of these were collection the bottom of the test tube. When the “system” was placed beside a white piece of paper it became a more intense color. The liquid was clear in color, meaning that it was possible to see through the test tube. When placed behind a black background the “system” was harder to see. Every time the “system” was moved the particles inside shifted. When the test tube was shaken the liquid changed to a light blue color, almost being violet. ( time was 3:13 ) Bubbl