Aim
The aim of the experiment was to compare the densities of expanded polystyrene foam and corrugated cardboard using a ruler, a micrometer, a vernier caliper, and an electronic balance.
Introduction
Density is the amount of substance per unit volume. The density, is a measurement of how the substance is tight together. The Greek scientist Archimedes is the person who discovered the fundamental of the density. The density of an object is calculated using this equation:
D=M/V Equation (1) where D is the density, M is the mass of the object and V is the volume of the object. The volume of a rectangular object can be expressed in the equation:
V=LWH Equation (2) where L is the length, W is the width and H is the height of the object.
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In general, the foam has less density than the cardboard. The density of the sample of the foam consistent with the material. However, the density of sample of the cardboard is inconsistent with standard value. This discrepancy was as a result of over tightened and under tightened of measurement. Non precise calculation had also added in this discrepancy. To overcome these errors, the following solution can be done. First learn to use the measuring tools correctly. Second use more regular shape for each sample. Read the result more than once time to be more accurate.
Conclusion
The densities of expanded polystyrene foam and corrugated cardboard have been compared. The average density of cardboard (0.1828 g/cm3) greater than the average density of foam (0.0352 g/cm3). The errors may have been due to misread measurement, shape not regular and over tight or under
Thorough analysis of the graph displayed enough evidence suggesting that an increase in substrate concentration will increase the height of bubbles until it reaches the optimum amount of substrate concentration, resulting in a plateau in the graphs (figure 2). Hence; supported the hypothesis.
Finding the Densities of an Unknown Solid and Liquid in Order to Determine What they Are
Discussion: The percent of errors is 59.62%. Several errors could have happened during the experiment. Weak techniques may occur.
The protective packaging industry can be segmented three ways by use: positioning, block, and bracing; flexible wraps; and void fill. Coated (e.g., AirCap) and uncoated air bubble products serve the flexible wrap and void fill markets (refer to Glossary). The flexible wrap market, which dwarfs void fill as measured by annual sales, is of primary concern to Sealed Air and will thus constitute the focus of this report.
The purpose of the experiment is to determine the ID of an unknown diprotic acid by establishing its pKa values. The first phase is to determine the unknown diprotic acid by titration, which is a technique where a solution of known concentration is used to determine the molecular weight. While the second phase involved seeing how much NaOH needed to standardize diprotic acid.
Brandon Meas Block: B Day 4 Lab day 1 5/12/17 Lab day 2 5/23/17 Lab Day 3 6/2/17 Lab 9: Acids and Bases Purpose: The purpose of the lab is to calculate the concentration of a known acid. Using the data collected from this lab, you will calculate the molarity of the acid. Introduction:
The unknown bacterium that was handed out by the professor labeled “E19” was an irregular and raised shaped bacteria with a smooth texture and it had a white creamy color. The slant growth pattern was filiform and there was a turbid growth in the broth. After all the tests were complete and the results were compared the unknown bacterium was defined as Shigella sonnei. The results that narrowed it down the most were the gram stain, the lactose fermentation test, the citrate utilization test and the indole test. The results for each of the tests performed are listed in Table 1.1 below.
In this experiment, there were several objectives. First, this lab was designed to determine the difference, if any, between the densities of Coke and Diet Coke. It was designed to evaluate the accuracy and precision of several lab equipment measurements. This lab was also designed to be an introduction to the LabQuest Data and the Logger Pro data analysis database. Random, systematic, and gross errors are errors made during experiments that can have significant effects to the results. Random errors do not really have a specific cause, but still causes a few of the measurements to either be a little high or a little low. Systematic errors occur when there are limitations or mistakes on lab equipment or lab procedures. These kinds of errors cause measurements to be either be always high or always low. The last kind of error is gross errors. Gross errors occur when machines or equipment fail completely. However, gross errors usually occur due to a personal mistake. For this experiment, the number of significant figures is very important and depends on the equipment being used. When using the volumetric pipette and burette, the measurements are rounded to the hundredth place while in a graduated cylinder, it is rounded to the tenth place.
So we can work out through this method that the volume of a box with
Possible sources of error in this experiment include the inaccuracy of measurements, as correct measurements are vital for the experiment.
In experiment 5, we are learning about density and specific gravity in measurements. Density is measured by mass divided by volume in order to get the ratio of the mass of an object to its volume. Specific gravity, on the other hand, is the density of a substance divided by the density of water and will cancel out the units in order to get a unitless measurement. Mass and Volume can be measured in two different ways, first mass can be calculated by directly placing it on the triple beam scale directly, or by weighing the difference. Volume can be calculated by displacement in the graduated cylinder or by calculating its dimensions. In this experiment, the objectives were to calculate the density of a solid by measuring its mass and volume,
Mattresses industries are rubberized industries which are mainly y deals with converting latex into rubber sheet, which are further used for making tyres, rails, bands etc. . . . graded and qualit y latex are further converted in t=o output which are mattresses pillows etc. .
...ld also do this. Both of these suggestions would give a better average and reduce scatter. Most of these changes are not necessary as the procedure is quite reasonable. However a change in the apparatus could improve the experiment. For example more equipment.
= T 0 T L dT The coefficient of volume expansion () is defined as “ratio of fractional change in volume to the change in temperature, at constant pressure.” = 3 Commonly, gases and liquids have higher coefficient of volume expansion. Materials with higher coefficient of expansion subject to larger changes in length or volume, and as a result, more likely to crack during rapid heating or cooling processes. When two materials with great difference in coefficients of expansion combine, cracking or separation may occur at the binding surface due to different thermal expansion rates. In industries and everyday life, thermal expansion has many important positive and negative consequences.