CH 204 – Introduction to Chemical Practice Experiment #2 – Gas Laws Jose De Arrigunaga* Robert Gonzalez TA: Ryan Ciufo September 29, 2015 EXPERIMENTAL The power adapter was plugged into the left side of the LabQuest, and the pronged end was plugged into a power outlet. The LabQuest was turned on using the power button on the front of the device near the top left corner. The gas pressure sensor was plugged into Channel 1 of the LabQuest. “Sensors” was selected at the top of the screen, then “Data Collection.” The drop down arrow was clicked in the Mode box, and “Events with Entry” was selected. The Number of Columns was set to “1.” “Volume” was typed in the Name box, and “mL” was typed in the corresponding Units box. The syringe was prepared …show more content…
A stir bar was added to the bath to evenly heat the water, and the stirring was turned on. The gas pressure sensor was plugged into Channel 1, and the temperature probe into Channel 2 of the LabQuest. “Sensors” was selected at the top of the screen, then “Data Collection.” The drop down arrow was clicked in the Mode box, and “Selected Events” was selected. The Name was kept as “Event,” and the corresponding Units box was left blank. The open end of the plastic tubing was twisted firmly into place to the gas pressure sensor. The two-way valve on the rubber stopper was in the OPEN position, and the rubber-stopper assembly was inserted into a 125-mL Erlenmeyer flask. The two-way valve on the rubber stopper was closed. Once the water was boiling, a ring stand and a metal clamp were used to carefully submerge the flask assembly into the boiling water bath. The metal part of the temperature probe was placed into the boiling water. “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. “Stop” was
The temperature probe was then quickly cooled to room temperature. When this was achieved, the hot water was immediately transferred into the calorimeter. This method of keeping the temperature probe cooled before measuring a new temperature was repeated throughout the entire experiment. Temperature data was collected for 180 s while swirling the temperature inside the calorimeter. The calorimeter still contained the warm water.
We were asked to correctly communicate these findings as we tested each of the substances she had encountered with both water and hexane. In experiment number three, The Relationship Between the Volume of a Gas and the Temperature, we where given a list of materials and asked to come up with our own procedure, which we did using zip lock bags filled with air, and submerged fully in a measured amount of water in order to find the volume, and then the change in volume when the temperature of the water was increased. In the fourth experiment we were asked to find the temperature of heated water, based on the cold and warm water. The experiment also required that each section be preformed several times in order to ensure accuracy, and also asked that the experimental responsibilities be split up between lab partners, each doing a section of the testing. This gave us an opportunity to work together with our fellow lab partners, with no one person doing the bulk of the work.
Then, the pipet was rinsed with distilled water. The bulbs were then attached to the pipette; filling and dispensing water were practiced using both bulbs. Furthermore, the 250-mL beaker was weighed, and its mass was recorded. After that, the Erlenmeyer flask was filled with 100 mL of distilled water. The temperature was recorded.
In the experiment they used probes to test for pH, dissolved oxygen, total dissolved solids, conductivity, and turbidity. The probes hook up to the computer and collected the averages for each test. They collected this data and used it for later evaluation of the contaminates. They also tested for iron, copper, and chlorine with different tablets.
Although, regardless of the incorrect data I still could observe how each of the temperatures decreased differently for the period of time for each of the test tubes, because of coincidental having a hypothesis supported by the data. A realistic improvement that can reduce the impact of the issue on the data, is having the three members of the group, each of them in charge of a test tube, so each person will pour the amount of water needed, start the timer when they finish (each member will have a timer), measure and record the temperatures they get from the test tube they are in charge of. The results will be shared between the members
The science behind this is very simple, it involves the behavior of gases. Atoms in a gas is free flowing. They respond and move faster when there is heat, and slower when it is cooler because of a loss of energy. It then changes the pressure of the gas, as the atoms in a certain volume of gas changes. In this experiment, we heated to can with water in it until it was boiling, which
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
Measure enough water in mL to cover the block in the calorimeter. Measure the temperature in (℃) of calorimeter water. Let water with block heat until it boils at 100℃. Measure temperature of boiling water in (℃).
Equipment: List the equipment you need to conduct the experiment in alphabetical order. Draw a labeled diagram clearly showing what the equipment is and how it is used, preferably large and easy to understand. Procedure: List the steps you follow to conduct the experiment. -Every
interface which plugged into a computer and Logger Pro opened. To calibrate the probe, Experiment-Set Up Sensors-Showed All Interfaces was selected and then Calibrate Now was on. The probe was cleaned in distilled water and dried. Then the probe was placed into a buffer solution. There was two buffer solutions, one with a pH of 4.00 and the other with a pH of 7.00.
Tap the sensor dry, and then dip the sensor in tap water, then in the three bowls of distilled water. Place the sensor in the orange juice and measure the current. Record the current in your lab notebook.
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.
so when the water reaches boiling point, the steam makes contact with the thermostat, causing it to flex in the opposite direction, which in effect pushes a lever that cuts the circuit and switches off the kettle
Place the the beaker onto a hot plate that is on a low heat setting (about setting 3). Every 5 minutes for 20 minutes, measure the circumference of the balloon and record it in Data Table A. You can measure the circumference of the balloon by looping a piece of string around it then using a ruler to measure the string’s length. Record the data in the data