There need to be two chemicals that interact to release energy and also a fluorescent dye to accept this energy and convert it into light. Although there is more than one recipe for a lightstick‚ a common commercial lightstick uses a solution of hydrogen peroxide that is kept separate from a solution of a phenyl oxalate ester together with a fluorescent dye. The color of the fluorescent dye is what determines the resulting color of the lightstick when the chemical solutions are mixed. The basic premise
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Removal of chemical residues -Microbe “trap” Nutrient In most cases‚ effective cleaning can meet microbial control objectives 5 Separate sanitizing step Possible agents Hypochlorite Quats Alcohol Hydrogen peroxide Peracetic acid May require final rinse (exc. alcohol & peroxide) Another residue concern 6 Final rinse Rinse to remove sanitizing agent residues Unless rinse with sterile water‚ will reintroduce organisms into system 7 Sanitizing option Sanitize after
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2.5.1. Processing Steps of Hydrogen Production from LPG Conventional process for producing hydrogen from light hydrocarbons involves the following process steps: • Feed preparation • Sulfur removal • Steam reforming • CO shift conversion • Autothermal reforming • Process gas cooling • Synthesis gas purification (PSA pressure swing absorption) [5] 2.5.1.1. Sulfur Removal LPG feed first passes through an ambient temperature sulfur adsorption vessel
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or active oxygen species are oxygen that is more energetic compared to the normal molecular oxygen. They are unstable and are formed either through loss of electrons or addition of protons. For example super peroxide anion (O2.-) and protonated per hydroxyl radical (H2 O2-)‚ hydrogen peroxide‚ H2 O2 and hydroxyl radical OH. (Smirnoff‚ 2007). . When these species are in the body‚ they become threats to cells
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Decolorization and Chemical Oxygen Demand Reduction (COD) of Simulated Textile Wastewater using Fenton’s Reagent Submitted to: Eric Siy COE 5100 – Statistical Research and Design Chemical Engineering Department College of Engineering De La Salle University – Taft‚ Manila by MARIA KATRINA A. PULUTAN MS Chemical Engineering 1st Trimester AY 2010-2011 1. INTRODUCTION Nature is threatened by the environmental contamination caused by the wastewater produced and discharged every day
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Abstract The enzyme peroxidase has been shown to break down H2O2. Enzymes are known to increase the rate at which a chemical reaction occurs. We looked at factors that affected the breakdown of hydrogen peroxide. These effects are the different temperatures and pH levels the enzymes were placed in. We found that the optimum‚ or best condition‚ temperature for the enzymes tested was about 22 degrees Celsius. The optimum pH level for the enzyme was 7. Introduction Enzymes are biochemical that catalyze
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the activity of the enzyme catalase in liver and potatoes‚ and to investigate the effect of temperature‚ surface area‚ pH and certain chemicals on the activity of catalase. Equipment: Dilute hydrochloric acid solution x 1ml 10 volume hydrogen peroxide x 100ml Copper sulphate solution x 1ml Aluminum nitrate solution x 1ml Zinc nitrate solution x 1ml dilute NaOH solution x 1ml Mortar and pestle x 1 25ml Beaker x 1 Hot plate x1 Porcelain tile x 1 Toothpicks x 8 10ml pipette
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longevity. Hypothesis: The glow sticks will last longer when they are frozen than when they are at room temperature. Background information: Glow sticks are made of hydrogen peroxide‚ a phenyl oxalate called ester‚ and phosphorescent dye. The ester and phosphorescent dye are kept in one part of the glow stick‚ the hydrogen peroxide in the other‚ separated by a piece of glass. No chemical reaction occurs until the glass breaks‚ combining the chemicals together inside the tube. Cooling a glow stick
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Purpose The purpose of this catalase lab is to design simple experiments to demonstrate how various factors affect the rate of enzyme activity. This lab shows how the enzyme decomposes in hydrogen peroxide. Methods and Materials Refer to handout attached to the back of lab Observations Table 1: The mL of oxygen produced with increase of catalase 30secs 60secs 90secs 120secs 150secs 180secs Disks: 2 17ml 16ml 21ml 26ml 31ml 35ml Disks: 4 8ml 19ml 27ml 35ml 44ml 53ml
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decomposes hydrogen peroxide into water and oxygen. Also catalase positive. Enterococcus faecalis doesn’t show produce bubbles in addition of H2O2 which means it doesn’t produce oxygen and is catalase negative. Conclusion/Interpretation: Bubbles appeared after placing H2O2 shows positive reaction to the catalase enzyme. Depending on the strength of the reaction‚ the bubbles may be tiny or relatively large. The primary reaction catalyzed by catalase is the decomposition of hydrogen peroxide to form
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