In the design of a Bunsen burner, explain the purpose of a.
Lab Report 1: Techniques and Measurements
The air vents control the rate at which air enters the burner 2. Why is a luminous…. Milestone: Capable of determining how polymersome shape and size could affect the enzyme Quantify the parameters related to the substrate-enzyme interaction inside the polymersomes. Chemistry is an experimental science that depends on careful observation and the use of good laboratory techniques.
In each mini-lab, we will carefully use correct units and measurements to solve solutions…. Preparation and standardization of 0. By determining selected constant properties of the unknown and then comparing these properties to the constant properties of known substances….
Synopsis 2. Objective 3. Theory 3. Procedures 4. Results and Calculations 6. Discussions 7. Conclusion 8. References 1. Synopsis: This report is written about determining…. These electrodes are connected to an off-chip custom-made readout interface circuit for the measurement of minute capacitive changes and for the acquisition of data into a computer.
Herein, we discuss and demonstrate the characterization results of such a system using a low complexity air-based technique.
Additionally, we demonstrate the applicability of these devices for spirometery on breathing tests of human subjects. Based on these results, the….The purpose of this experiment is to test the accuracy and precision of the person doing the experiment as well as find the density of a metal rod.
The accuracy and precision with which one performs experiments is a very important factor in their success as a scientist. In this laboratory, the accuracy and precision of my own laboratory techniques was tested by finding the mass, volume, and eventually density of a brass rod and comparing it to known values.
Back in the day, Archimedes was posed with a problem. The king did not know whether or not his crown was truly made of gold. Archimedes was perplexed though because he could not find the volume of the crown.
It was not a perfect shape such as a cube or sphere, and because of this, it was difficult to find the volume of the crown.
He remedied this problem by displacing the crown with water and seeing how much water flowed out of a filled container when the crown was allowed into it. Once he found the volume of the water, he knew it had to be the same as the volume of the crown because the volume of a liquid does not change with its container, only its shape. Upon taking the ratio, he found that the density of the crown was less than that of the pure gold sample he was given. The crown-maker had alloyed the crown with a less-worthy metal!
The purpose of calibrating the graduated cylinder is to determine how accurate measurements can be made with it. Results from this analysis will tell how accurate the cylinder is and how many significant figures are usable in calculating the density of any substance using its volume measurement.
The purpose of having standards and constants in this experiment to have a control. The purpose of having a control is to test for how much change occurred in the experiment; it serves as a basis for comparison. Our measurements will inevitably have variation within them, and to find the amount of variation, we use a statistical process called standard deviation.
Using standard deviation to find the average variation of measurement, we can find a mean line to symbolize our data and use that as the most accurate measurement because it symbolizes hundreds of trials within the time it took to make four or five. We can also assess the quality of our density measurements by comparing our measurements to that of the known measurements. This method is statistically relevant according to the lab manual. The material being analyzed in this laboratory is brass.
The brass cylinder is about an inch and a half in length, 4mm in diameter with sawed-off edges. It is golden with stain spots in color, and smells metallic.
It is smooth and warm to the touch. The brass rod resonates at a high pitch as compared to typical vocal ranges. In part A, the mass of the graduated cylinder was found to the nearest thousandth of a gram because that is how accurate the balance is.
In part B, this cylinder and its most accurate reading were then used to find the density of a known metal by first finding the mass of the metal using the balance to its most accurate reading.
The mass of three measurements and the average volume of the three measurements was found to increase the accuracy.
In part C, The same technique as in part B was used, but it was applied to an unknown metal. For part A, the accuracy of the graduated cylinder was calculated by finding the mass of the water through subtracting the mass of the empty cylinder from the mass of the full cylinder. The actual mass of the water was calculated by using its known density at In part B, the volume of the metal rod was calculated by subtracting the calculation of the water and the metal combined volume from the water only volume.
The mass was found using the balance and the density values were made sure to be within 0. Results: the mass of the cylinder and the water together increases linearly as more water is added to the cylinder.Lab 3 January 30, 1.
Title: Laboratory Techniques and Measurements 2. Purpose: The purpose of this lab is to learn laboratory techniques and to how to measure precisely. During this lab I will learn how to measure length, temperatures, volume, density, and mass using laboratory equipment.
I will be using laboratory equipment to prepare dilutions and calculate them while using an algebraic formula. Procedure: In order to perform this lab I needed the following materials:. In the design of a Bunsen burner, explain the purpose of a. The air vents control the rate at which air enters the burner 2. Why is a luminous. Laboratory Techniques and Measurements Lab 1 The purpose of this lab was for the student to get involved with his or hers new lab kit as well as being able to know, identify and use each other tools provided in the kit.
Another key learning aspect of this lab is to teach the student how to measure properly the many units in the SI system. I will be using laboratory dilutions, measurements, and weights to then calculate using algebraic formula.
Throughout lab one we were introduced to.
C F Version Lab RepoRt assistant This document is not meant to be a substitute for a formal laboratory report. When I first started to work I started working as a team leader for a company name Medicia Corp. My responsibilities and duties were to supervise all operations of a production line including personnel, from the beginning stage to the final packaging process. I acquired a lot of knowledge of what quality control was in the manufacturing field.
This makes density is considered an intensive property, meaning it is dependent on the identity of the substance, regardless of its source.
On the other hand, mass and volume are both extensive properties, signifying that they change depending n the quantity of substance present.
In order to measure mass in the laboratory, the analytical balance is always the device used, as it is accurate to 0. Volume can be found easily by taking measurements of an object, if it has a regular shape such as that of a cube, cylinder, or cone.
However, with irregularly shaped objects, it the displacement of water experienced by immersion of the object that is used to indirectly measure its volume.
Lab One: Laboratory Techniques and Measurements
Accuracy is defined as the closeness of a measurement to the actual, or expected, value. On the other hand, precision refers to the closeness of repeated measurements. These terms are important to know, as we determine the uses of different laboratory materials. The most accurate and precise measurements for liquid volumes are made with burets, volumetric flasks, and volumetric pipets. Meanwhile, the graduated cylinder is less accurate, but just as precise as the above tools.
Finally, beakers and flasks in the laboratory are neither accurate nor precise. Objective: We had two main objectives in this lab.
Secondly, we aimed to calculate precision and accuracy of the volumetric pipets, a graduated cylinder, and either a flask or beaker. From the recorded temperature, the density D of the water was determined from the table on p. Finally, the calibrated volume of the This protocol was repeated for a total of three trials. Using V from each of the three trials, the average and standard deviation see p. An analogous procedure was used to calibrate a 10 ml from a graduated cylinder.
Part B: Determination of the Density of an Unknown Liquid The density of and unknown liquid was determined by using the calibrated volume of our pipet Part A and the recorded mass of the unknown liquid.
With this difference in mass, and the volume from Part A, we calculated the density. We repeated this procedure for two additional trials, to find an average density of the liquid. Part C: Determination of the Density of a Regularly Shaped Solid In this part of the experiment we obtained a small, solid steel cylinder and set out to find its density. Since the object in this part of the experiment was a cylinder, we only had to measure its radius and height.
Part D: Determination of the Density of an Irregularly Shaped Solid In this part of the experiment, we had to make a more complicated measurement of density with an irregularly shaped solid. We obtained and weighed a screw to 0. Since the screw was irregularly shaped and does not have a uniform equation for volume, we instead used the displacement of water.
To do this we obtained a suitable 25 ml graduated cylinder and filled it halfway with water, recording the observed volume. Then we carefully immersed the screw into the graduated cylinder, and recorded the new volume reading.Please join StudyMode to read the full document. Experiment and Observations: The experiment performed in the first part of this lab was to mix various chemical solutions together and then observe and record the chemical changes, also if a chemical change occurred at all.
The observations I made were recorded with the lab manual data table 1 as a guide as to which chemicals to use. A total of eight chemicals were mixed together on this part.
The experiment performed in the second part of the lab was heating 4 different chemical substances s and observing the changes made to them.
Also determining if a chemical change had occurred. One test was performed with the substances in the tubes and another with the chemicals outside of the tubes and over the open flame. The observations I made were recorded in the data table 2 and located in the questions section of this lab report.
Data Table 2 Chemical Initial Procedure: Measure the volume, mass, length and temperature of a variety of items. Create dilution of sugar water. Data Tables and Observation: Fill out the data sheet below for the experiment and submit with this form. Recording data carefully and accurately is very important. Be sure to keep notes of experimental errors or difficulties during this experiment.
Exercise 1 Length Measurements : For the measurement below carefully read the ruler to the best degree of accuracy. The reading you make in centimeters should have two decimals. In other words can you estimate the difference between If so, you would report If you see 10 cm, than you would report Refer to the lab for more information.
Record the Data Table 6 — Densities Version Lab RepoRt assistant This document is not meant to be a substitute for a formal laboratory report.Our knowledge of chemistry and chemical processes largely depends on our ability to obtain correct information about matter.
Often this information is quantitative, in the form of measurements. In this lab, students will be introduced to some common measuring instruments so that they can practice making measurements, and to learn about instrument precision.
1: Introducing Measurements in the Laboratory (Experiment)
In Part A of this lab, a metric ruler will be used to measure length in centimeters cm. In Part B, a beaker and a graduated cylinder will be used to measure liquid volume in milliliters mL.
In Part C, an electronic balance and a triple-beam balance will be to measure mass in grams g. Since all measuring devices are subject to some error, it is impossible to make exact measurements.
Scientists record all the digits of a measurement that are known exactly, plus the first one that is uncertain. These digits are collectively referred to as significant digits. Digital instruments, such as an electronic balance, are designed to limit themselves to the correct number of significant digits, and their readings are properly recorded as given.
However, when using analog instruments such as rulers and thermometers, the experimentalist is responsible for determining the correct number of significant figures. These instruments are properly read to one place beyond the graduations of the scale.
The ruler markings are every 0. The correct reading is 1. The first 2 digits 1. The last digit 1. You may have instead estimated it as 1. When measuring liquid volumes, the graduated scale must be read from the lowest point of the curved surface of the liquid — the liquid meniscus. The graduated cylinder markings are every 1-milliliter. The correct reading is The first 2 digits The last digit Even though it is a zero, it is significant and must be recorded.
Here, the thermometer markings are every 1-degree. You may have instead estimated it as Note that the measuring devices used in this lab may have different scale graduations than the ones shown in these examples. Thus, be sure to make it a regular habit to check the scales on all equipment.Chemistry is the study of matter. Our understanding of chemical processes thus depends on our ability to acquire accurate information about matter.
Often, this information is quantitative, in the form of measurements. In this lab, you will be introduced to some common measuring devices, and learn how to use them to obtain correct measurements, each with correct precision. A metric ruler will be used to measure length in centimeters cm. All measuring devices are subject to error, making it impossible to obtain exact measurements.
Students will record all the digits of the measurement using the markings that we know exactly and one further digit that we estimate and call uncertain. The uncertain digit is our best estimate using the smallest unit of measurement given and estimating between two of these values.
These digits are collectively referred to as significant figures. Note, the electronic balance is designed to register these values and the student should only record the value displayed. When making measurements, it is important to be as accurate and precise as possible. Accuracy is a measure of how close an experimental measurement is to the true, accepted value.
Precision refers to how close repeated measurements using the same device are to each other. The correct reading is 1. The first 2 digits 1. The last digit 1. You may have instead estimated it as 1. The measuring devices used in this lab may have different scale graduations than the ones shown Precision is basically how many significant figures you have in your measurement.
To find the precision, you basically take the smallest unit on your measuring device, and add a decimal place the uncertain digit. In general, the more decimal places provided by a device, the more precise th e measurement will be. Measurements obtained in lab will often be used in subsequent calculations to obtain other values of interest.
Thus, it is important to consider the number of significant figures that should be recorded for such calculated values. If multiplying or dividing measured values, the result should be reported with the lowest number of significant figures used in the calculation. If adding or subtracting measured values, the result should be reported with the lowest number of decimal places used in the calculation.
Calculate his velocity or speed. If In this lab, students will also determine the density of water as well as aluminum. Volume is the amount of space occupied by matter. An extensive property is one that is dependent on the amount of matter present.CHM107 Experiment #1 Lab Techniques & Measurement Exercise #3
Volume is an extensive property.
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