Temperature Change Lab Report

When placing the large test tube in boiling water, be sure to keep the face of the large test tube away from you or any lab partners with safety tongs.

We took the plastic cup and added the stir bar into it, then we inserted the plastic cup and the stir bar into the styrofoam cup. Next, we secured the clamp on the ring stand rod, and then added the solution calorimeter to the other end of the clamp. Following that, we took the beaker and filled it with distilled water and transferred it to the graduated cylinder. Then we poured it into the plastic cup with the stir bar in it. We turned the stir plate to number 6 and let the water stir around for 10 seconds, then we added in our first effervescent tablet and let it for about a minute or until it was fully dissolved. We added an extra tablet to every test until we reached the total number of tablets we could insert which was 5. After we were finished with each test, we washed out plastic cup, the solution calorimeter, and the stir

Place the beaker on the hot plate, place the thermometer in the beaker and set the hot plate to 5oC.

9) Trial E: Remove the syringe and empty the beaker. Add a Thermometer to the beaker. Add 200 mL of Room Temperature water to the beaker and heat with a Bunsen Burner until it reaches 100° C. Remove the Bunsen Burner. Repeat Steps 5 & 6.

Fill a test tube about 1/3 full with cold tap water for use in step 34.

4.Measure 35mL of warm water and add them into each of the 4 test tubes at about roughly the same time. It is essential that the water is warm. Do not seal the test tube.

The jar was held in place so that it did not obstruct airflow in straw when it was placed over the candle. The process of trial 1 was repeated three times with the additional straw.

4. Remelt the contents of the tube and add the counterpart component based on the given schedule. Ask the demonstrator to adjust the cooling water between mixtures. During the experiment, record and plot the data obtained for all mixtures listed. The experiments are stopped as follows:

An increase in internal energy is required to convert a solid to a liquid,. Conversely, a reduction in internal energy can cause liquids to freeze or solidify. When heat is added to a solid or a liquid, the temperature of the sample does not necessarily rise. During a phase change, heat is added to the sample without an increase in temperature. Heat absorbed or released as the result of a phase change is called latent heat. There is no temperature change during a phase change, thus there is no change in the kinetic energy of the particles in the material. Latent heat is an intensive

One theory of heat is that the laws of physics only allow the energy transfer from hot temperatures to cold temperatures. This is displayed in the calorimeter experiment. A calorimeter is an apparatus used to measure the specific heat of several materials, it is designed so little heat is lost or gained to the surroundings. Imagine a copper ball that is heated in boiling water and dropped into a calorimeter that contains water at room temperature. The substances have entirely different initial temperatures. What will happen? The heat from the copper ball with distribute within the water causing them to begin to equalize in temperature. This is because the summation of all heat energy in a closed system is equal to zero therefore, the same amount of energy moves between the two systems during a thermal interaction causing them to be the same temperature. This displays thermal equilibrium in work. A system is said to be in thermal equilibrium if its state variables are constant and not changing. Therefore, when the hot copper ball is dropped in the room temperature water the temperatures of both interacting systems will become equal to each other in temperature if the molecules have enough time to interact.

Collect to 2 large beakers both large beakers are to be filled with hot water (labtutor). Then obtain seven conical tubes these will be used to collect the levels of gas, you will also need test tube a stopper and a plastic tube (labtutor). You want to fill the conical tube to at least 50 ml of water (Cressy). Take the four conical tubes filled with water and place two in each beaker, to do this you must invert the tube and cover the release hole as to not lose any water (Cressy). Then place the beakers with the tubes in the bath so they can be at the same temperature as the bath (Cressy). Next mark all of your test tubes in number order to be sure which tube contains what concentrations and pH (Cressy). Having mixed a solution to the specifications of 2.5 ml of glucose in all tubes, 3 ml of yeast in 2 tubes of pH 5, 2 tubes of pH 9, and the single pH 7 tube, the remaining two tubes will contain no yeast as they will be negative controls. Next add 2 ml of pH buffer 3 tubes will receive pH of 5, three will receive a pH of 9 and a single tube of pH 7. Finally add pure water to make sure all test tubes have 10 ml of solution. When making the solutions

7.When water bath is ready, put each test tube into the water bath. Wait 5 minutes.

Once the range is obtained, remove the thermometer and beaker. Pour out the hot water and allow both the thermometer and the beaker to cool. Once cool, repeat the previous steps with the second compound, tetradecanol. At the conclusion of the second experiment, repeat the steps for a third and final time using an equal mixture of both compounds. Be sure to record the melting point range for all three experiments.

Take one stopper off and carefully pour the shots into the paper towels in the beaker. Put the thermometer in and close the paper towels around it. Measure the temperature of the shots immediately.

Rinse the thermometer with tap water and dry. Insert the thermometer in the calorimeters top and measure the initial temperature of the base 28.2∘C