Lab Report Chemistry Lab
The first test was to measure levels of dissolved oxygen and temperatures at different depths. The procedure for testing the dissolved oxygen and temperature was carried out using a submersible probe. The procedure consisted of lowering the submersible probe by 50 cm increments deeper and deeper into the lake water off of the dock and taking measurements at each increment. The measurements were then recorded, averaged, and reported to the rest of the class. Another test was taken, but this time it was a sampling of the plankton in the lake water.
2) The glass beaker was placed in the freezer. 3) The temperature of the heavy whipping cream was checked with the thermometer every few minutes until its temperature reached 3˚C. 4) The heavy whipping cream, which was then at 3˚C, was transferred from the beaker to the container.
One thermometer have a wet bulb , the bulb of the thermometer have a wet tissue or cotton while the other thermometer have a dry bulb and both were moved in a waving motion for two minutes and read the results after reading let the thermometers stand for two minutes before getting the next reading. The said procedures are repeated every thirty
I will put the thermometer into the beaker and stir the water, leave the thermometer till the temperature stays constant.-this will give the normal water temperature. 13. I will take the water out the beaker and wipe it dry. 14. I will activate the heat packs wait for a minute put thermometer onto the copper to see the temperature 15.
“Collect” was clicked to begin data collection. Once the pressure and temperature stabilized in the boiling water bath, “Keep” was clicked. The heating was turned OFF on the hotplate, and ice was added to the bath to cool it. “Keep” was clicked once the temperature of the bath cooled to 95°C. The procedure was continued as the temperature continued to decrease, and “Keep” was clicked at every 5°C increment until the bath reached 0°C.
The experiment that was done was to figure out “Does the amount of calcium chloride affect the temperature of water?” For the procedure, the experiment asked to record the initial temperature of 75 mL of water. The first trial said to add zero scoops of calcium chloride and stir for two minutes to record the temperature. Once the first temperature was recorded, it must be written from the difference between the initial temperature and the new temperature. Next, it asked to add one scoop of calcium chloride and stir for two minutes and record.
The question is, how does a physical or chemical change affect the mass of a substance within a closed system? To respond to this question, my group did a lab to determine whether or not the mass would change or not. Our lab was to have a plastic bag containing baking soda, then add a cup of vinegar and a block of clay to the mix. We made sure to weight every element separately and then add them up for our total mass of 31 grams before the reaction. During the reaction, as soon as the vinegar was poured in there was a gas produced, bubbles.
Put the beaker with the water and the metal on the wire gauze of the ring stand that has the bunsen burner under it. Fill the graduated cylinder with enough water to about fill the calorimeter and record the amount of water and the temperature of the water that is in the graduated cylinder. When the water starts to boil in the beaker, use the thermometer to record the temperature of the water. Pour the water from the graduated cylinder into the calorimeter. Use the crucible tongs to take the metal out of the beaker and place the metal into the calorimeter and close the
Before the experiment began I had to read the laboratory manual, while I read it what grabbed my attention was stated in the lab manual water boils at 100 degrees Celsius. Just as I continued to read the manual as an assignment, I was going to “investigate the relationship between the concentration of solutes in water and the temperature at which the water boils” for the class the next day. At this point, my curiosity began the experiment. I started to think how long it took for the water to boil? A question arose, by adding sodium chloride to the water will the temperature change for the water to boil?
The temperature probe was connected to the LabQuest pro. After, string was cut and a piece of filter paper was placed on the tip of the temperature probe. The string was used to tie the filter paper to the tip of the temperature probe. The probe was then placed in a container of liquid based on its group. Alkanes: Pentane, Hexane, Heptane; Alcohols: Methanol, Ethanol, 1-Propanol, 2-Propanol, 1-Butanol; Misc: Water, Acetone.
OEI: Method: 1. A beaker 100ml tripod 2. Thermometer inside water via retort stand 3.
We also collected quantitative data for the aquatic chamber. We collected how much dissolved oxygen in the water, the pH of the water, and the water’s temperature. It was Billy’s job to collect the temperature of the water and how much dissolved oxygen there was in the water. To find the temperature of the water, Billy used a temperature probe that could be put in the water and placed it into the water. Billy then used a special probe that measures the dissolved oxygen and placed it into the water to get the amount of the dissolved oxygen.
Then, using two coffee cups, observe the temperature increase from the first thermometer in the calorimeter. After it has stopped increasing, record the final temperature. Next, weight a small portion of your unknown sample and record the mass and place it in the water bath for ten minutes and record the temperature. Pour the unknown element into the calorimeter. Monitor the temperature and record it in the data table.
Cyclohexane is put into 25mL round-bottom flask. It is heated to a boil. Once it starts boiling, it evaporates up touching the tip of the thermometer and into the condenser, and out into a graduated cylinder to be recorded. Every 1mL of cyclohexane that dropped into the graduated cylinder, was recorded alongside with the temperature. During the first 3mL of cyclohexane temperature was raising at a fast paste.
I looked over the instructions one last time and decided not to bother with them. It’s not like I couldn’t understand them – they were for a simple 8th grade science experiment, and I was an 8th grader with an interest in science. My problem with them was that they called for me to waste an entire hour moving a single thermometer between several different flasks of water. The different colored flasks were to be heated by an incandescent lightbulb, and the data I was supposed to gather by hand would reveal the exact nature of the relationship between the color of each flask and the amount of energy it absorbed. The concept of the experiment intrigued me, but I just couldn't accept the fact that I would have to manually track the temperature of each flask.
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