Unit 3 Measurements Lab Report

Purpose: To learn about the international system of units (SI), to become familiar with common lab equipment and techniques, to gain proficiency in determining volume, mass, length, and temperature of a variety of items using common laboratory measurement devices, to learn to combine units to determine density and concentration, and to use laboratory equipment to create serial dilutions and determine the density and concentration of each dilution.

The measuring cylinder was then used to accurately measure out 20 mL of water, which was then poured into the test tube that would be used for the experiment. The test tube was then placed into the clamp, which was then adjusted in order to make sure that the test tube was grasped firmly and would not fall out.

Purpose: To become familiar with the International System of Units and common laboratory equipment and techniques. To learn how to determine volume, mass, length, and temperature of a wide variety of items. To learn how to calculate density and concentration of dilutions.

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.

A scale conversion is calculated and the measurements from each thermometer are examined to see how closely correlated they are. _M___

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,

The class did very well in terms of the accuracy and precision of class A pipettes. The tolerance for class A pipettes is ±.006 for 1mL, ±.01 for 5 mL, and ± .02 for 10 mL (. As a whole the class did rather well in terms of the expected accuracy and precision of the class A glassware. I found the expected values from a website. The student who had the best calibration was student number 1. There recorded values were within the closest range of each pipette. I believe that my data is not within the best simply because, one; my one mL pipette was not delivering the entire amount of water, two; I was pretty relaxed in my measurements, I will be honest and say that I did not ensure that each draw was perfect, in which I did not check at eye level if the bottom of the meniscus was exactly on the line. So in order to be more accurate, I could make sure and try to make perfect draws every time.

In order to carry out this experiment, we had to go through the process of multiple steps. First, we measured 100 ml of water in two different-sized square containers. The bigger container had a surface area of 225 centimeters squared, while the smaller container’s surface area was 100 cmշ. Next, we put both containers under a heat lamp for an equal amount of time. Then we set the containers aside.

The purpose of the experiment is also to help us get familiar with the lab equipment, know how to find the meniscus when measuring with the graduated cylinder and understand the difference between accuracy and precision, and i believe that this is also what I learned from this experiment. I learned how to use some of the laboratory equipment such as the graduated cylinder and the balance. I learned that when reading the measurements of the graduated cylinder, you have to look at it at eye level and read the meniscus. I also learned that when weighing something on the balance, you have to make sure you place the balance at zero and you have to make sure your hand is not hovering over it, because it can affect the outcome of the weighting results. I also learned how to find the percent difference and why measurements are not always precise, which is because of errors (statistical or systematic) that can happen when performing the experiment.

The measuring tool used is metal and the temperature inside the classroom causes it to constrict or expand, therefore giving inaccurate

The purpose of this experiment was to use different statistical tools to compare and contrast their measure quantities. We conducted our experiment to see which of the three measuring devices, pipette, beaker or buret, was the most accurate device to measure water. We concluded that the pipet is the most accurate measuring device because the class data contained a relative standard deviation of 6.49% for the pipet, which is lower than both the beaker, at 13.98%, and the buret, at 7.97%. On our data points for each of the three measurement devices, we did not have any outliers based on the Q test. Our data did not compare well with the class data. Our 95% confidence aspect of the data compared well within a few tenths with each measurement device, but the % error, standard

I began the measureable experiment by getting a pencil and marking each centimetre for 10 centimetres so I could put this inside the wine glass to measure the height of the water. I began with 1cm and was sure to measure the height at eye level to reduce parallax error.

The amount of water used in the micro-test tube was measured until it was exactly 1cm from the top of the test tube.

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