Pipet Vs Calorimetry

This experiment was performed to determine the difference in density between pre-1982 pennies and post-1982 pennies. In addition, we were given an unknown substance and our task was to configure what it was through calculating its volume,mass, and density. Furthermore, we were being introduced to the procedures of displacement in this experiment as well. All together, we were given the task of finding out why there was a difference in density between the two pennies. My partner, Michael Sapawa, and I first had to measure the mass of both pennies using a scale. Then we calculated the volume of the samples with graduated cylinders through the method known as displacement. We then applied our schema and drew out the formula for density, which

The purpose of the experiment was to test the levels of water contamination in each beaker to see how high each vial would contaminate the water based on the color the water became once each vial was poured into the given beakers. In Experiment 2: Water Treatment, I used potting soil, sand, activated charcoal, gravel, alum, bleach, and beakers with my own-supplied tap water. The purpose of this experiment was to see if the different particles placed in the tap water could be removed by various filtration techniques. In Experiment 3: Drinking Water Quality, I used several various test strips, each individual strip testing for ammonia, chloride, 4-in-1, phosphate, and iron, along with samples of Disanti bottled water, Fiji bottled water, and my own tap water from home. The purpose of this experiment was to determine if bottled water is any more or less filtrated than my own tap water at home.

In this lab experiment our main focus was to get skillful in using tools such as the metric ruler, balances, thermometer, and graduated cylinder to capture measurements of length, mass, temperature and volume. Additionally, this lab helped us to become more familiar with the uncertainty of measurements, as well as becoming efficient with rounding our measurements to the correct numbers of significant figures. Our results are measured consistently with rounding to the closest answer we could possibly acquire as the data can tell you.

The lab uses the measurements of a wooden dowel in length and diameter to collect data in order to interpret data in report form. The data is used to produce statistical data and how to correctly present it. A ruler and micrometer were used to measure the dimensions. Spreadsheets are then constructed in order to generate standard deviation, mean, median, mode, frequency, as well as variation of length, diameter, volume, and cross sectional area of the

Conclusion: The purpose of this lab was to find the relationship between the mass and the volume of the four samples. The densities from least to greatest were shortest(4), short(3), medium(2), and longest(1). Density can vary with temperature, and that could cause errors in the collected data. A real world application of density is icebergs. Icebergs float because they are less dense than the water around them. The icebergs are made of frozen freshwater but they are surrounded by very cold salt water. Initially, salt water has a higher density than freshwater and the low temperatures of the water cause the density to increase even more. The salt water and its increasingly high density allows for the less dense icebergs to float. Knowing this about density is good to know so we can figure out how things in the world work, like how and why massive icebergs float in the middle of the

The experiment is repeated twice and an average is obtained. This ensures the consistency of the measurement as the reading is triplicated, thus reducing anomalies. It can be seen that the reading obtained were around the same value. This proves that the results are reliable.

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

Corresponding to the previous experiment, this week’s experiment measures the participants’ ability to conduct basic, fundamental laboratory procedures. These procedures revolve around scientific measurements of volume, mass, and density. Unlike last week’s activity, this week’s experiment had a few modifications. In addition to distilled water, saltwater and an unknown substance were added. There was a total of five substances to choose from; Hexane, Methanol, Ethyl acetate, Ethylene glycol, and Dichloromethane. Part C, the unknown liquid number was four, which the average density was 0.789 gmL-1, and from looking at the chart the unknown identity was methanol. Part A, the temperature of the water was 20 oC, which was in front of the class,

1. Gathered all required materials to designated lab bench. 2. Considered all safety precautions including the prevention of spilling water to avoid falls, handling glassware carefully to prevent shattering, avoiding long periods of working with warm water to avoid burns and avoiding the digestion/inhalation of by-products produced after the reaction (e.g. ethanol and carbon dioxide gas). 3.

The mass of the aluminum cylinder was 17.1420 g. The volume of the aluminum cylinder, by calculation was 6.33 cm^3. Based on water displacement, the volume was 16.5 ml. The density by calculation of the aluminum was 2.71 g/cm^3. Based on water displacement, the density was 1.04 g/ml.

(with lids & gauge). It showed that there was significant difference between the two situations that

The volume of a small test tube and a thin-stemmed pipet were determined in this section of the lab. Water was poured into a small test tube until the water reached the very top edge of the test tube. The test tube was then emptied into a plastic 25 mL graduated cylinder and volume was measured and recorded into data table 3. A think-stemmed pipet was completely filled with water. Drops were carefully counted and emptied into the empty plastic 25 mL graduated cylinder until the water level reached 1 mL. The number of drops in 1 mL was recorded into data table 3. The thin-stemmed pipet had a total volume of 4 mL and that was also recorded into data table 3.

addition of a few liters of water can be accurately observed and quantified. Additionally, the

The tool with the highest degree of certainty was the non-mercury thermometer because it didn't have to be calibrated and there were tick marks to make the measurement more accurate. The tool that had the smallest degree of certainty was the dial 2 thermometer because it very wide. This caused the measurement to be harder to make. In Station 4, a spring scale, an electric balance, an analytic balance, and a one pay balance was used. The most accurate tool was electric balance because no calculations or estimations needed to be made. The least accurate tool was the spring scale because the scale kept moving and block couldn't be measured without a basket carrying it, making the measurement inaccurate. In Station 5, a graduated cylinder, a beaker, and an Erlenmeyer flask was used. The tool that had the highest degree of certainty was the graduated cylinder because there were more ticks. This made the measurement more accurate because the water level was closer to the markings. The least accurate tool was the Erlenmeyer flask because the spaces between the markings were large so the whole number had to be guesstimated. In station 6, #1 was accurate because the X's exactly on the lines. #2 was precise because multiple X's were close to

When I designed multiple tests which were using the coca cola bottle with ⅓ (667 milliliters)which was for the first test and a Mountain Dew bottle for the second trial which was ¼ (500 milliliters). The second day we tested the group designed tests of ⅓ (667 milliliters) and ½ (1000 milliliters). The final test we did on the third day was ⅓ (667 milliliters) and ½ (1000 milliliters). After all three days of testing the group decided that ⅓ (667 milliliters) and a round cylinder bottle worked the best. Overall all of our tests were fair enough since they all had accurate results and we had good data recorded. The only difference between the ⅓ bottle and ½ bottle was that is that the ⅓ bottle went higher but came down faster than the ½ bottle. The Final Recommendation is to use a round cylinder bottle and ⅓ full of water (667 milliliters) because it goes the highest and it goes straight up since it has the perfect water