Examination of Water and Wastewater 5210 BIOCHEMICAL OXYGEN DEMAND (BOD)*#(1) 5220 CHEMICAL OXYGEN DEMAND (COD)*#(2) 5220 A. Introduction Chemical oxygen demand (COD) is defined as the amount of a specified oxidant that reacts with the sample under controlled conditions. The quantity of oxidant consumed is expressed in terms of its oxygen equivalence. Because of its unique chemical properties‚ the dichromate ion (Cr2O72–) is the specified oxidant in Methods Section 5220B‚ Section
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Case 8: Panera Bread Company 1. Panera Bread’s strategy is to make great bread broadly available to consumers across the US. The vision was to provide consumers with a high quality‚ authentic‚ fresh-dough artisan bakery and upscale quick-service dining experience. The following key elements comprise the Panera Bread strategy: a. Capitalize on market potential by opening both company-owned and franchised Panera Bread locations as quickly as possible. Management planned to expand the
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Physical & Chemical Properties Data Table 1: Solubility or Reaction Substance Name Color Odor Effect of Heat Cold Water Hot Water Litmus test Dilute HCl Dilute NaOH Mg Silver None None None None Base Fizzes‚ gas‚ increased temperature None Cu Brown None None None None Base None None Zn Silver None None None None Base Fizzes None MgO White Slight odor None None Bubbles Base Dissolves‚ turns yellow‚ increased temperature None CuCO3 Green None Melts
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Observations of Chemical Changes Purpose: The purpose of this experiment is to predict and examine chemical changes/reactions among common chemicals found in consumer products at a macroscopic level. Procedure: The procedure of this experiment was to carefully mix different chemicals together using the chemical filled pipettes and the 96-well plate and determining what chemical reactions occurred. Data Table: Observations of Chemical Changes Experiment 1: Observations of Chemical Reactions |
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Sample Paper – 2012 Class – X Subject –Chemistry Chemical Equations and reactions Very Short Answer (1 marks each) Write the name and formula of compounds forms between a. Potassium and iodine ion .b.Sodium and sulphide ions . c. Aluminums and chloride ions 2. Why does milk sour when kept for a long time/ 3. What happen when hydrogen combine with oxygen in presence of electric current/ 4. Define electrolysis. 5. What is decomposition reaction? Give an
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Glysdi Lin P. Martin Grade-V Bais City-Special Science Elem. School October‚11‚2013 Activity 2 I Problem: Identifying the products of chemical change. II Hypothesis: I think that the chemical change is an irreversible process. The wet iron filings by the next day it will turn into rusting material because it is exposed to the atmosphere. While the dry iron filings is not III Materials: The setup in the previous activity‚ small plate‚ dry iron filings. IV Procedure: 1. Place the
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lobe of the brain can cause an individual to develop different impulses and as well impulsive behavior (Schwartz‚ 2012). There are even disorders and illnesses such as Depression‚ Schizophrenia‚ and Bipolar Disorder believed to be the result of chemical imbalances in the brain. However‚ biological factors can also determine decisions and actions. Pharmaceutical medications have shown that people make different decisions when on the medications versus when not on them. Individuals treated for attention
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Bad PR Case Study Examples Perrier Recall 1) Problem Perrier‚ the largest US bottled water company (commanding 57% of US market)‚ voluntarily recalled its entire inventory in the US after tests showed the presence of the chemical benzene in small sample of bottles in North Carolina in 1990. The product was not pure and could also contain harmful substances more dangerous than tap water‚ creating a danger of product reputation collapse. Reports and statements were very inconsistent: FDA spokesperson
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bDATES PERFORMED: JANUARY 8‚ 2013 CHEMICAL EQUILIBRIUM D.M. TAN1 AND P.B. ALEGRO2 1DEPARTMENT OF MINING‚ METALLURGICAL‚ AND MATERIALS ENGINEERING‚ COLLEGE OF ENGINEERING 2 INSTITUTE OF CHEMISTRY‚ COLLEGE OF SCIENCE UNIVERSITY OF THE PHILIPPINES‚ DILIMAN QUEZON CITY‚ PHILIPPINES RECEIVED JANUARY 15‚ 2013 RESULTS AND DISCUSSION A. Iron- Silver Equilibrium The first part of the experimentation focuses in the iron-silver system. Silver nitrate (AgNO3) was added to ferrous
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ReportTitle: Observations of Chemical ChangesDate: 9/9/13Name: Purpose: The purpose of this experiment is for the student to gain knowledge and experience regarding how avariety of chemicals react to one another. In addition‚ the student should also gain a betterunderstanding of the household chemicals that they use in their day to day lives.Procedure:Observe the chemical changes that occur by mixing a list of chemicals (provided in the lab manual).Add 2 drops of the first chemical into a well in the 96
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