Introduction The goal of this experiment was to acquire an understanding of the fundamentals of measurement in addition to analyzing the gathered data. During the experiment, an understanding of basic experimental error was gained as well as how to utilize the error equations to account for margins of error in each experiment. For Investigation 1, the mass, length and diameter of four separate cylinders was measured and utilized to calculate the volume and density of the cylinders. After recording these results in the table, the data of the cylinders was graphed. Then, in Investigation 2, a Geiger counter was utilized to measure background radiation in the lab at intervals of one minute for sixty minutes. The time period sixty minutes was used to generate a more consistent amount of results (increased amount of data points), as opposed to the 20 minutes originally recommended in the lab book. The levels of radiation were recorded and graphed on a histogram with specifically calculated bin sizes. Furthermore, the background counts per minute were also calculated as well as the uncertainty of the data. To complete the experiment, we calculated the standard deviation of the data and analyzed it in comparison to the calculated uncertainty. Investigation 1 Before the investigation could be started, a digital scale had to be located. Then, the digital calipers were acquired in addition to …show more content…
Following that step, the uncertainty of the masses was determined in addition to the errors for the measurements of the cylinders. Then, the length and the diameter of the four cylinders were obtained using the digital caliper. After acquiring these measurements, the relative error and uncertainty was determined and the volume of the cylinders was calculated and recorded in excel. The relative error and the uncertainty for those data values were also
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.
First the ball had a small hole directly in the center and the rod had an uneven end these presented challenges for getting an accurate measurement in step III. Second the errors in the measurements were carried through and expanded by the calculations performed. The obtaining the volume via the displacement method was only one step without calculations. Thus I believe the displacement method produce better measurments. 4.
From this graph there is a clear difference in the mass of the pennies depending on their year of manufactoring. We can see that there is a clear decrease in mass in the early 1980’s. Since we were not able to collect data for pennies manufactured for the years 1980, 1981, or 1982 in our random stack, it is clear there was a change in the mass of the pennies between in a year between 1980-1983. Even though there is slight variation between the two definite groups of the mass in the pennies, the small differences could have been from external factors explained in the errors section. 4.)
a=What Jake is copying a=What James is copying a=What Zach is copying a= What Sean is copying Solubility of Sugar Lab Names: James, Jake, Zach, and Sean 2/28/16 5W Purpose: The purpose of this lab is to create crystals of hard rock candy from a supersaturated solution. Material List: hot plate triple beam balance 400 mL beaker clean glass jar Cup String 3 cups of sugar 1 cup of water beaker tongs food coloring (optional) glass stirring rod Procedure: 1.First collect materials listed 2.Use
This highlights the variability of natural radiation levels across different regions and the importance of considering this factor in establishing safe dose limits. Despite these elevated levels, nature continues to operate as usual. This consistent pattern
The location I chose for my inventory lab rotation is the Warm Springs Rehab Hospital in Kyle, TX. Warm springs rehab is a Hospital where patients are getting treated will and will be taken good care of and its also a place to feel comfortable such as a home. Which I spent two hours there. At the beginning, we were introduced to the Caroline Holt which is the dietitian of the Warm Springs Hospital, Caroline showed me and my partner the kitchen and she explained what they do on a daily bases, we also saw the dishwasher area which was very neat, then she showed us the cooking area which was next to the cooler, which is easier for them when they need to cook, which everything was organized and clean. After that we went to the office which was
Procedure: With all materials needed, proceed to use the aluminum block to determine the mass and then record in a table. Then fill the graduated cylinder halfway with water and record the volume of the water precisely. Tip the cylinder gradually being cations as not to spill and slide the aluminum block into the graduated cylinder. Put the cylinder straight up and confirm the block is absolutely submerged. Afterwards record the volume.
Question 4 : Final written procedure: 1) Make a table with 4 parts (clay size, mass, volume, density) and 3 trials. 2) Get 3 pieces of green modeling clay. 3) Cut and make sure the modeling clay is small, medium and large. 4) First measure the mass of each modeling clay with a triple beam balance to prevent the modeling clay from getting wet.
Radioactivity associated with the fungal sample on each filter was measured in a liquid scintillation analyzer (Beckman Coulter, LS 6500 multipurpose scintillation
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?’
Introduction The purpose of this experiment was to apply all knowledge gained from the entire semester while in the lab and apply it to be able to identify an unknown genus and species gram positive bacteria. Each student was given a petri dish with an unknown Gram positive bacterium inside. The petri dish with the unknown gram positive bacteria that was used in my experiment was #8. The possible bacteria inside my petri dish could be any of the following: Bacillus subtilis, Bacillus cereus, Mycobacterium species, Corynebacterium species, Lactobacillus, Staphylococcus aureus, Micrococcus luteus, Staphylococcus epidermidis, Enterococcus faecalis, Streptococcus pyogenes, and Streptococcus pneumoniae Hypothesis
Gamma decay is the most hazardous to bystanders as it can penetrate skin and damage living human tissues. It does this by damaging DNA due to its high energy which can break atomic bonds, a phenomenon of ionizing radiation. Calculate the half-life for In-116 using the data given to you from computer printouts. (2 points)
There are two different types of radiation, initial and induced. An example of initial radiation is black rain. Black rain was a thick, oil-like substance that fell soon after the bombings. It was a dangerously radioactive water that was ingested by breathing or drinking the contaminated water. Induced radiation was found in things like soil and concrete.
RESEARCH QUESTION Which one has a higher rate or respiration between dicotyledonous (peas) and monocotyledonous (maize) seeds and what is the effect of temperatures (room temperature, 40, 60) on the rate of respiration as determined by oxygen usage estimated with a respirometer? AIM The aim of this experiment is to investigate which seed has a higher rate of respiration and how different temperatures (room temperature, 400C, 600C) affects the rate of respiration of dried, fresh and germinating monocotyledonous (peas) and dicotyledonous (maize) seeds.
To be licensed, the facility must have been designed with multiple fail-safe measures, and must establish extensive and well documented safety procedures, and worker training. The common features of all commercial irradiation facilities are the irradiation room and a device to transport the food into and out of the room. The transport system employed in a large food irradiation facility is similar to that used for sterilization of medical products and can be either a conveyor or a rail system. The speed of the belt helps to control the radiation dose delivered to the food by controlling the exposure time. In order to prevent inadvertent gamma radiation exposure, the source must be insulated from the outside world by a 1.5 to 1.8 metres thick concrete shielding surrounding the irradiation room.