4-nitroaniline had a percent recovery of 18.67% and naphthalene had a percent recovery of 80%. Naphthalene had a relatively high percent recovery‚ and the loss of product can be explained by error inherent. The low percent recovery of 4-nitroaniline is mainly due to the fact that anhydrous sodium sulfate was accidently added to the flask. Therefore‚ some product was lost as the aqueous solution with the protonated 4-nitroaniline reacted with the drying agent. However‚ more errors to explain the results
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Lab 1 – Measurement of Space and Time Anthony Lucci Lab Partner: Amy Hayes Question 4: Both the height and diameter of the cylinder were taken to find the volume; five times for both measurements. Vernier calipers were used to get these measurements by clamping the cylinder between the jaws of the calipers. By looking at the mark of the zero‚ in relation to the main scale‚ the line best lined up with a line from the main scale was taken down. Getting
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of discovery science c. serves to increase the sample size of the experiment d. allows for the simultaneous testing of multiple variables e. is subjected to the factor whose effect is being tested Feedback Your answer is correct. Question 4 Incorrect Mark 0.00 out of 2.00 Flag question Question text How do hypotheses differ from theories? Select one: a. Theories are more comprehensive than hypotheses. b. Hypotheses are educated guesses‚ and theories are tentative explanations.
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Unit 1 Lab 1.1 – Explore the AdventureWorks Database Using the SQL Server Management Studio Learning Objectives and Outcomes Identify major relational database management systems (RDBMS). Identify main characteristics of relational databases. In this lab activity‚ you will explore a relational database in SQL Server 2008 Express. You should complete Lab 1.1: Explore the AdventureWorks database using the SQL Server Management Studio from the lab manual. At the end you should submit a document with
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Chemical Changes‚ Alice Kimbrell‚ Chemistry 101-DS01:74589‚ 5/31/2013. Purpose: In this lab‚ I will observe macroscopic changes that occur when mixing together certain chemicals and household cleaners. The mixing of the chemicals provided with each other and with acid/base indicators demonstrates how matter can change‚ and how chemistry can be seen with the naked eye. By mixing household cleaners with an acid/base indicator I hope to demonstrate how these changes can be related to everyday life
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Experiment 15 The Purification of Water Date Performed: 9/25/2012 Joe Shmoe Date Submitted: 9/26/2012 Chemistry 1046L-sec07 Lab TA: Blankity Blank Purpose: The purpose of this experiment is to learn about the various processes by which water is processed and treated. This experiment will involve removing chemical impurities in water through using techniques such as absorption spectrophotometry‚ sample collection‚ serial dilution‚ filtration PH and graphical analysis. If this
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Where has Shanghai to sell imported raymond Mill? The advanced productive forces led to the rapid economic development and the advanced production equipment and more help to the development of productive forces. So‚ our life is inseparable from the advanced productive forces and production equipment. The mill is a new production equipment can completely replace manual labor‚ there are a lot of milling machine model‚ according to the characteristics and the yield of the demand for processing material
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Date Submitted: June 16‚ 2013 Date Performed: June 13‚ 2010 Lab Section: Chem-181 DL Course Instructor: Purpose In this lab‚ I will be investigating some physical and chemical properties of gases and using these properties to identify these gases when they are encountered. * Procedure 1. Hydrogen * a. Place a small piece of Zn (mossy zinc) metal into the test tube containing
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is not in the normal blood pH‚ the person can fall sick and it might be harm to the person. The maintenance of blood pH is called acid-base homeostasis. Acid-base homeostasis is a complex synergy that involving lungs‚ kidneys and a buffer chemical in blood and blood cells. BACKGROUND A substance that has high concentration of hydrogen ion in solution is called acid and solution that has low concentration of hydrogen ion is base. Base
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1. Describe the function of the following pieces of safety equipment and how each might be used: a. Eye wash- To be used in the event of a chemical splash to the eyes. Should be used to flood the eyes for at least 15-30 minutes with water‚ flooding from the eye outward. b. Fire Blanket- To be used in the case of a small fire. Would be tossed onto flames to suffocate the flow of oxygen. c. Shower- Safety showers are designed to flood your body with water in the event of a fire or chemical spill
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