this experiment‚ the amount of titrant dispensed correlates with the amount of copper; therefore‚ the amount of copper in brass was calculated by using the data recorded. In this experiment‚ the analyte is copper and the sample is brass. The concentration range of copper in brass is 50-95%. When copper reacts with iodide it forms a precipitate (CuI) along with iodine. As shown in this reaction: 2Cu2++ 4I- 2CuI(s) + I2. Iodine is formed because copper
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Introduction The purpose of this lab was to calculate and determine the optimal dosage of ultraviolet (UV) light to expose Saccharomyces cerevisiae (S. cerevisiae) to that would result in a survival rate of 20-40%. Saccharomyces cerevisiae commonly referred to as baker’s yeast is a single-celled eukaryote. Yeast is capable of growing as either a haploid or a diploid cell. The diploid cell can reproduce mitotically or sporulate‚ a process initiating meiosis and forming an ascus with four spores (Sacchromyces
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This lab has brought great interest to me because this is the way physicians’ control/treat infectious disease within our bodies. In this lab‚ chemotherapeutic agents were evaluated by the disk-diffusion method. Chemotherapeutic agents are placed on the surface of a Petri plate containing Mueller-Hinton agar‚ which allows the agents to diffuse freely‚ and a growth medium is incubated over its’ surface. During incubation‚ the chemotherapeutic agents move from levels of high concentration‚ to low
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purpose of this investigation is to determine the concentration of an hydrochloric acid (HCl) solution by titrating it with sodium hydroxide (NaOH) solution of accurately known concentration. Titration is a common laboratory method of quantitative chemical analysis that is used to determine the unknown concentration of an identified analyte.¹ Titrant means substance with known concentration existing in buret‚ analyte means substance with unknown concentration in erlenmayer and indicator means chemical
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Reese‚ 2008). The environment plays an important role in the reaction that enzymes have. In this experiment‚ enzymes were exposed to changes in temperature‚ pH‚ and concentration. Introduction In this experiment‚ the environment of the enzyme was altered‚ by increasing or decreasing the temperature‚ pH and concentration. The purpose was to observe if and how the enzyme would react to such changes. This experiment tested whether heating or cooling a catalase would increase or decrease
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Egg Lab Report Introduction: An egg is a model of a human because the egg has a cell membrane like humans do inside and outside of the body that let things pass through like water. We can use eggs to study the effect of changes in the external environment on the internal environment by having harsh environments like putting the egg in only alcohol and see what happens to the inside of the egg. Diffusion is the movement of a substance down its concentration gradient from a more to a less concentrated
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converts them into different molecules‚ the products. Enzymes are extremely selective for their substrates and speed up only a few reactions from among many possibilities (Encarta‚ 2007). Activity is affected by temperature‚ chemical environment
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molar ratio of the reactants and products taking part in the reaction. There are three major categories of stoichiometry problems such as mass-mass‚ mass-volume‚ and volume-volume. Convert to desired limit Molar Ratio Convert to moles Along with the three major categories‚ after finding the quantity that you need‚ stoichiometry will let you find the limiting reactants and the excess reactants. The limiting reactant is the reactant that limits the amount of product formed in the chemical reaction
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My hypothesis states if antimicrobial concentration increases‚ then the zone of inhibition will increase because the higher the concentration‚ the more the antimicrobial will disinfect the area of bacteria and thus the zone of inhibition will increase.The results of the lab do support my hypothesis. Paragraph 2: My antimicrobial was bleach. Bleach contains hypochlorous acid which “causes bacterial proteins
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Experiment 14: Molar Mass of a Solid Angela Parra Laboratory Partner: Eugenia Jimenez Chemistry 1310 Instructor: Dr. Gao Laboratory Assistant: Lauren February 7‚ 2015 Abstract: The purpose of this experiment is to determine the molar mass of an unknown solid. The freezing point of a solvent (Cyclohexane) was determined‚ and compare to the freezing point of Cyclohexane with the addition of two different concentration of unknown solid. The pure substance of Cyclohexane has defined physical properties
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