On April 6, 2016 at approximately 11:45am, a local police station got a call about a hostage situation at a local pharmacy. When police and medical examiners got to each crime scene, they learned that all of the hostages were given drugs and had overdosed on them. Some of the pills, in powder form, were found near the victims. One of the victims was stable enough to tell the investigators that the power on the floor were the drugs they were forced to take. The medical examiner found out each hostage was given either unknown A or unknown B.
The hypothesis made, the density calculated in the experiment will stay the same because the density of the unidentified object will never change, was supported. The results support the hypothesis because in every trial the density always came out to 9g/mL. In trial one the mass was 71.16g, the volume was 8mL, and the density was 8.895g/mL, but when rounded to the proper sig fig came out to 9g/mL. In trial two the mass was 71.12g, the volume was 8mL, and the density was 8.89g/mL, but when rounded to the proper sig fig came out to 9g/mL. In trial three the mass was 71.14g, the volume was 8mL, and the density was 8.8925g/mL, but when rounded to the proper sig fig came out to 9g/mL. When averaged the mass was 71.14g, the volume was 8mL, and the density was 9g/mL. Errors that could have occurred are, not calculating the density correctly, not completely submerging the unidentified object with water in the graduated cylinder to get the volume, not rounding the sig figs correctly when finding the density, not measuring the unidentified object’s mass in grams, not measuring the unidentified object’s volume in milliliters, and not writing the correct units with the proper number or not the correct unit at all.
With following the procedure, the experiment was completed very easily. The technique used worked very well. The graduated cylinder were dried after each trial to ensure each water level was equal. The air bubble were risen to the top to ensure the equal amount was measured. Systematic errors can not be eliminated by averaging In principle, they can always be eliminated by changing the way in which the experiment was done.
Shifa Sayeed can you check if this is all in past tense and if it has personal pronouns? The purpose of this experiment was to observe and thoroughly analyze how different substances of dissimilar intermolecular forces acted in different scenarios of evaporation, evaporative cooling, and boiling. In the lab, the three substances tested and compared were Acetone, Acetic Acid, and Propanol.
Unknown Lab Report Unknown # 25 By: Jenna Riordan March 19, 2018 Bio 2843 1. Introduction Microbiology is the study of microorganisms found in all different environments throughout Earth, from the hot thermal vents at the bottom of the ocean to the ice at the top of a mountain.
In the “Blast Off” lab, we had launched a foam rocket into the air by pumping air into a nozzle, shooting the rocket up, and then recording the time from launch to when it hit the ground. I have learned and now understand the mechanics of kinetic and potential energy. The experiment I had conducted relates to energy in that as we observed the rocket, its energy was constantly transforming as it was in motion. Kinetic energy is an object’s energy based on its motion. Potential energy is energy based on an object’s shape or position.
The Density Exploration lab called for us to use two different methods to calculate the density of copper with various shapes and sizes. The second experiment called for us to devise an experiment to calculate the differences in density between soft drinks. Rather than calculating using two different methods to calculate for the same substance we had two different soft drinks, diet and non-diet Coca-Cola. We then used two volumetric pipets to measure the volumes of the soft drink, then placed the soda in a beaker to calculate the mass using an analytical balance. The questions that I considered before beginning the experiment were, “How does each method of calculating density affect the outcome?’
Monica A Smith Tuesday at 1 p.m. Microbiology Lab Fall 2015 Page Break Introduction: In knowing why it is important to understand how to identify an organism it is best explained by helping the person preforming the test identify the patients treatment options and plan. Also helps in understanding the organism in detail and how it can be identified in the future versus similar organisms. Materials and Methods: Two unknowns where received by the instructor unknown K and C. using the methods learn in lab for identifying them.
By comparing the expected mass (0.0785g) with the mean mass (0.0700) that gained from the practical, the difference of the values is small (0.0085g), so this means that the accuracy is high. For the volume of 7.8 μL (0.0078ml), since the density should be one, by deriving the formula of density = mass/volume, the expected mass is 0.0078g. By comparing the expected mass (0.0078g) with the mean mass (0.0100) that gained from the practical, the difference of the values is small (0.0022g), so this means that the accuracy is high. When 790μL of absolute ethanol is pipetted, the pipette drips.
Variables Independent variable – the variable which will be manipulated throughout the investigation is the primary protein structure of the genes that will be compared across the organisms. The primary protein structures of genes which will be compared are insulin (INS), retinal (RPE65), growth hormone (GH1), amylase (AMY1A), and pepsin (PGA5). The entire sequence of the protein of the selected genes will be compared for all the organisms. Dependent variable – the variable that is affected by the independent variable.
To start, the first hypothesis was supported. The first hypothesis stated that when the level of water increases, there will be a higher pitched sound when blown over. Bottle C; the bottle with the most water; fifteen and a half centimeters; produced the highest pitched sound. The waves in the bottle reflected between the top of the bottle and the surface of the water which had a seven-centimeter difference, to create a shorter wavelength and higher frequency. Bottle A was filled five and a half centimeters of water which caused the lowest pitched sound.
In an interview with E. Poimenidou, professor of Mathematics, he described a good mathematical writing as precise, not overly verbose, and have a kind of flowing logic to them. A New College graduate student (2013) in chemistry/biology said that a well-written lab report should be factual, to the point, and evidenced based. A good lab report, according to a chemistry TA at NCF, has a “flow” of ideas that makes it stand out from other reports.
The purpose of the experiment was to figure out which means of measurement was more accurate in reaching the proposed weight, the graduated cylinder or the pipette. Two new terms that were mentioned and crucial to the project were standard deviation and reproducibility. Standard deviation was a new term for me in the case that I had never used it in science before only in math classes, I did not understand why the difference between the data collected and the mean was important but now I see it is to see how different the tests were from one another and if the measurement is accurate in the sense that it is constant. The reason that reproducibility was different was because I was stuck on the fact that the experiment had to be repeated by us, and not asking the question , if others did the same thing as us would they be able to get similar data, it was an important reminder, ( Kinnes and Eddington).
It was impossible to accurately measure the volume of liquid at any given moment, as the meniscus was moving side to side. Secondly, the distillation was ended while there was still liquid in to round bottom flask. The composition and volume of this liquid were unaccounted for in the calculated
INTRODUCTION: Good Laboratory Practice is a quality standard where there is an implementation of designed laboratory studies and this is reported to ensure the result is uniform, consistent, reliable and also reproducible with quality and integration of chemical nonclinical tests of safety. There are proper procedures and protocols in GLP which are to be implemented by the laboratory GLP includes following: 1. Good laboratory management (including quality management) 2. Improved efficiency (cost reduction) 3.
