The effect temperature has on the activity of the enzyme α- amylase. Introduction Enzymes are a biological catalysts‚ which means that they speed up the chemical reactions in living organisms. Almost all of enzymes are energized protein molecules that catalyse and regulate nearly all biochemical reactions that occur within the human body. The reason in which enzymes are sensitive to heat‚ pH and heavy metal ions is because they are made up of proteins. The food we eat is turned into energy by enzymes
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ml of 1M solution = 10.6g Weighing of salt using electrical balance * Mass of Na2CO3 + beaker = 78.64g * Mass of beaker = 68.04g * Mass of Na2CO3 = 10.6g 1. 10.6g of Na2CO3 was weighed in a dry beaker. Small amount of distilled water was added and the salt was dissolved. 2. The contents of the beaker were transferred to clean volumetric flask of 100ml. 3. Collection of washings was done 3-4 times. 4. The solution was made 100ml
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contamination : - resulting from 20th century activities in atomic physics‚ such as nuclear power generation and nuclear weapons research‚ manufacture and deployment. (See alpha emitters and actinides in the environment.) * Thermal pollution : -is a temperature change in natural water bodies caused by human influence‚ such as use of water as coolant in a power plant. * Visual pollution : -which can refer to the presence of overhead
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Purpose: The purpose of this lab is to identify the presence of cations and anions in four unknown solutions by identifying whether they are copper‚ silver‚ iron‚ or chloride ions which is done by adding sodium hydroxide‚ solid copper‚ silver nitrate‚ and potassium thiocyanate to the solutions and analyzing the chemical reactions. Introduction: Chemical change‚ unlike physical change is the change in the composition of a substance rather than simply its shape‚ size‚ or state (Marie‚ 2015). Signs
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Anhydrous sodium sulfate was added to the filtered organic solution to absorb excess water. Although water has a higher affinity towards sodium sulfate than cyclohexanol‚ excess anhydrous sodium sulfate may lead to the absorption of cyclohexane and thus loss of product. Anhydrous sodium sulfate absorbs water due to its polarity and therefore may also absorb cyclohexanol because of its polar O-H bond. If too much anhydrous sodium sulfate was added to the solution‚ part of the product would be absorbed
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Lincoln’s Ten-Percent Plan: 1863–1865 Events 1863 Lincoln issues Proclamation of Amnesty and Reconstruction 1864 Congress passes Wade-Davis Bill; Lincoln pocket-vetoes it 1865 Lee surrenders to Grant at Appomattox Courthouse Congress creates Freedmen’s Bureau Lincoln is assassinated; Johnson becomes president Key People Abraham Lincoln - 16th U.S. president; proposed Ten-Percent Plan for Reconstruction in 1863; assassinated by John Wilkes Booth in 1865 Andrew Johnson - 17th U.S. president;
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Stephanie Thao Chemistry 1151 Laboratory Analysis of acid by titration with sodium hydroxide Ms. Hoang November 2012 Introduction: The purpose of this experiment is to demonstrate an example of how to determine the unknown molarity of hydrochloric acid by titration with a base (sodium hydroxide). Titration is a common laboratory method of quantitative chemical analysis that is used to determine the unknown concentration of an identified analyte (wekipedia). The first step will be measuring
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1. A student neglected to add sodium carbonate when extracting the tea leaves with hot water. Yet a very high yield of caffeine was obtained. The crystals melted at 202-214°C. Explain. • The sodium carbonate is supposed to be added when extracting the tea leaves with hot water in order to help purify the caffeine. So since the student neglected to add sodium carbonate the caffeine won’t be pure but the student would still be able to recover a large amount of caffeine. The literature melting point
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Study Guide #2 Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. Perception is a process by which a. environmental stimuli are sensed. b. sensations are assembled into meaningful patterns that represent external events. c. sensations and experiences are stored permanently in the brain. d. many different forms of stimulus energy are converted into electrical signals for use by the nervous system. ____ 2. Figure and ground can
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given the various states of the economy. What is the expected return on this stock? A. 7.89 percent B. 8.56 percent C. 9.43 percent D. 9.90 percent E. 10.02 percent Expected return = (0.05 0.02) + (0.70 0.09) + (0.25 0.14) = 9.90 percent 32. You own a portfolio that is invested as follows: $11‚600 of stock A‚ $7‚800 of stock B‚ $14‚900 of stock C‚ and $3‚200 of stock D. What is the portfolio weight of stock C? A. 38.47 percent B. 39.73 percent C. 41.26 percent D. 41.94 percent E. 43.08 percent
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