SARA SARAFZADEH MS. RASSIAN IB EXPERIMENT DETERMINATION OF CALCIUM CARBONATE CONTENT IN AN EGGSHELL INTRODUCTION Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found
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therefor calcium chloride was not an option for the unknown as well. The last calcium compound left was calcium nitrate which also had a pH of 5 and a brick red flame test color. Introduction There was an unidentified white compound found in the lab. The goal of the experiment was to identify what the unknown compound is and how to dispose of it safely. In order to find this information, the compounds chemical and physical properties needed to be determined. This was a given table of possible
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Both ethanol and caffeine are present in many consumable goods such as beers and coffee (Lab Notebook). Both drugs are known for causing physiological differences in organisms. It is important to be aware of the potential ramifications these substances since they are so widely used and ingested. In humans, heart rates were increased slightly with the additional of ethanol (Abdel-Rahman 1987). In rats, heart rates were both increased and decreased with the addition of ethanol depending on the level
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as long as it was close to it. Then the test tube was placed inside the Erlenmeyer flask to which kept the test tube up right. After this was done the lab participant put together the “Apparatus” which consisted of the test tube with side arm inside the flask, a stopper, and HCl solution inside the test tube. The second step was for one of the lab participants placed the gas-generation solid that the teacher provided on to a balance to be weighed. This gas-generation solid was ¼ part of an Alka-Seltzer
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consist of combustion, as this is true because alcohols are able to burn because the end product they produce is water and carbon dioxide. A very obvious reaction they undergo is dehydration of course since they break down and produce water. In this lab, three different types of alcohols are evaluated
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Three different test tubes were used to test for the effect of alkalinity and temperature on the structure of DNA. The control of the experiment was test tube A because no variables were tested. This test tube was necessary in the experiment because it behaved as a baseline to compare with the results of the experimental variables. Test tube B was exposed to a high temperature (100°C) to observe the effect of high temperatures on DNA structure while test tube C was exposed to an alkaline pH through
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This practical was designed to investigate the effect that increasing temperature has on the enzyme catalase and its reactivity to the substrate, hydrogen peroxide. Enzymes are biological catalysts, which allow chemical reactions to occur under cellular conditions (PennState University, 2017). Cells contain thousands of different enzymes, and their activities determine which chemical reactions actually take place within the cell. Cooper G.M. (2000) stated that without enzymatic catalysts, most chemical
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were from the Human Physiology Laboratory Manual (Manuguid & Tidyman 2014). Each participant was told to not eat or drink within five hours before the lab, though were able to an drink 8 oz. cup of water while in the first two hours of fasting. Participants were asked to fully empty their bladders and record their time of void an hour before the lab had begun. Each participant was then divided into four different groups: (1) non-drinking, (2) water, (3 ) coke, (4) Gatorade. The participants had
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The purpose of the hydrate lab was to calculate the percent mass and the number of moles of H2O within a sample of Copper (II) Sulfate Pentahydrate. During the process of the experiment, there were multiple errors that lead to an average of 14% error from the theoretical value. One of the errors included the duration of time in which the hydrate was placed on top of the bunsen burner flame. The alterations in the duration of time between the two trials would lead to a difference in the amount of
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The purpose of this lab was to determine the effect of temperature and pH on the reaction rate of Catecholase. The substrates of catecholase are catechol and oxygen, and it is an enzyme that speeds up chemical processes. Enzymes work best under optimal conditions, and we tested the reaction rate of catecholase with substances containing different temperatures and pH levels. pH measures the acidity or alkalinity of a substance, and is measured on a scale from 1 to 14. Temperature is the measurement
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