Endothermic Change Lab Report

I took the graduated cylinder and started filling it up with water until the bottom of the meniscus was to the the 100.0 mL mark with the assistance of a dropper pipet. I then took the 13 x 100 mm test tube and slowly poured the water from the graduated cylinder into the test tube until it was full to the top. I then poured the water in the test tube out into the sink and put the graduated cylinder on the counter so I can get an accurate measurement of the lower meniscus to record on my data table. I once again followed the same procedure again filling a second test tube with water from the graduated cylinder then setting it on a straight surface to get an accurate measure of the volume to

Procedure: Using distilled water, premeasured containers and objects determine displacement of fluids and density of objects. Use ice and heat measure temperatures in Celsius, Fahrenheit and Kelvin.

Abstract: This experiment introduced the student to lab techniques and measurements. It started with measuring length. An example of this would be the length of a nickel, which is 2cm. The next part of the experiment was measuring temperature. I found that water boils around 95ºC at 6600ft. Ice also has a significant effect on the temperature of water from the tap. Ice dropped the temperature about 15ºC. Volumetric measurements were the basis of the 3rd part of the experiment. It was displayed during this experiment that a pipet holds about 4mL and that there are approximately 27 drops/mL from a short stem pipet. Part 4 introduced the student to measuring

seltzer tablet into it, and as I did so I started the timer. When Alka

The main objective of this experiment is to differentiate between a physical change and a chemical change.

Test tube 1 should have .04 g of benzophenone, test tube 2 should also have .04 g of benzophenone, etc., up to the fourth test tube.

Then, fill 3 measuring cylinders with 100ml of water. Measure out 15g of salt, using a balance, into 3 containers. That means that there are 5g of salt per pour boat. Add one pour boat of salt to one beakerful of water. Stir the solution (2) and then heat it up using a Bunsen burner. Add a temperature probe and wait for the water to start boiling. You will know when the solution is boiling, as it will bubble and produce water vapour. Repeat this 2 more times and then 3 times for 10, 15, 20 and 25 grams. Using this method you will be able to collect accurate, precise and reliable results. This method provides us with precise and accurate results as we are using equipment with a smaller

I will use a thermometer to measure the temperature of the water in the water baths. This will ensure the reliability of my results, as it will allow me to make sure the water

From the results recorded it was identified that activity A and C had exothermic reactions, whilst activity B had an endothermic reaction. Each of the activities had initially begun with 23.4/8/9oC, however, within one minute of adding the 2nd reactants, the results began showing, as seen from the graph. Activity A and C had risen in temperature, with A gaining 4oC and in total of 2 minutes having the temperature of 27.9oC along with C increasing by 2.2oC and within 2 minutes of the experiment having the temperature of 26oC. Activity B however was the anomaly in the test, as the temperature went lower, by 1.9oC as within 2 minutes, the Ammonium Chloride and water had the temperature of 21oC. Furthermore the line graph shows Activity A and C

First, get a hot plate and scale, and plugged them in, and turned them on. Then, get a thermometer to measure the temperature of the water. Then, get a 25 ML beaker. After that, measure the beaker on the scale before adding water. Then, fill the beaker up with water and measured it. After, add 6 scoops

at each temperature was calculated resulting in negative values, signifying the reaction was spontaneous. As temperature increased thevalues got less negative. The values ranged from -579 kJ to -510 kJ. The smallestvalue was -579 kJ at 6.0 oC (279 K) and the largest was -75.3 at 55.0 oC (328 K). The only value that did not agree with the other numbers was thevalue at 55.0 oC (328 K) having the largest value of -75.3 (kJ), which resulted in some discrepancies in the graph and a really poor best fit line when observing the graph ofverses temperature for the Al/Mg cell in figure 1 making it difficult to observe any trends. The positivevalue for the graph indicates an endothermic reaction, therefore the surroundings loses heat and its entropy decreases as can be observed by the -value for the slope of the graph.

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 control experiment for this investigation will be the experimental setup of 5 trials using 5oC as the temperature. All the steps in the method will be followed.

• The water must then be heated to 70oC (the first temperature for the experiment)

In this experiment, The purpose of this experiment is to investigate the measurement of the actual volume contents of volumetric glassware. In the beginning of the experiment, the volumetric glassware should be clean and dry before used. The volumetric glassware, measuring cylinder and pipette should be handled with care and all the precautions were be taken during the experiment was held. This was to ensure to avoid any errors such as parallax error especially while reading water meniscus. This experiment must be repeated three times or more and take the average reading to get more