Computer Enzyme Action: Testing Catalase Activity 6A H2O2 is toxic to most living organisms. Many organisms are capable of enzymatically destroying the H2O2 before it can do much damage. H2O2 can be converted to oxygen and water‚ as follows: 2 H2O2 → 2 H2O + O2 Although this reaction occurs spontaneously‚ enzymes increase the rate considerably. At least two different enzymes are known to catalyze this reaction: catalase‚ found in animals and protists‚ and peroxidase‚ found in plants. A great
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that atom in a compound. An element’s electronegativity value and other properties affect its oxidation state in different compounds. Decomposition: Some compounds decompose into more than one different element or compound as bonds are broken. Hydrogen peroxide (H2O2)‚ a chemical you may have around your house‚ is stored in a dark container to slow down decomposition‚ which can be caused by heat and light. clues that can indicate that a chemical change has occurred include: production of flames‚ color
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the mechanism or theory of enzyme action. Background The term peroxidase refers to both a class of oxidoreductase enzymes and to specific enzymes within that class. As a general class of enzymes‚ peroxidases catalyze the oxidation−reduction decomposition reaction of hydrogen peroxide. There are two general types of peroxidases—catalase and peroxidase. Catalase catalyzes the disproportionation reaction of hydrogen peroxide to water and oxygen gas (Equation 1). In reactions mediated by catalase‚
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the chemical process of RCA cleaning and provide a qualitative analysis on the cleaning capability of RCA standard clean. The method includes removal of organic contamination with H2O-H2O2-NH4OH solution ( 5:1:1) ‚ removal of hydrous film using H2O-HF solution (50:1) and elimination of metallic contaminants with H2O-H2O2-HCl solution (6:1:1). Three wafers were cleaned with the three-step-method and observed using external visual inspection before and after cleaning. The final results were compared to
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STK 1084 Inorganic Chemistry I‚ LU 3 Oxidation – Reduction Reactions‚ Prepared By: Dr. Tay Meng Guan‚ Faculty of Resource Science and Technology‚ Universiti Malaysia Sarawak. LU 3 Oxidation and Reduction Reactions 3.1 Ideas of Oxidation and Reduction Oxidation of an atom can be occurred in the following conditions: 1. Losing an electron from the orbitals. e.g.: A A+ + e- 2. Adding an electronegative element (e.g.: F‚ Cl‚ Br‚ O) to a molecule. e.g.: A + F AF 3. Losing hydrogen
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add equations for reactions with known enthalpies so that their net result is the desired reaction Sample Problem 1: Use the equations below to determine the enthalpy of reaction for the decomposition of hydrogen peroxide: H2O2(l) H2O(l) + 1/2 O2(g) The equations are: 1 H2(g) + O2(g) H2O2(l) 2 H2(g) + 1/2 O2(g) H2O(l) Hf = 188 kJ Hf = 286 kJ Solution: Sample Problem 2: Use the following equations: 1 1/2 N2(g) + 3/2 H2(g) NH3(g)
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70°C) Part 3. Effect of Concentration 1M HCl‚ 5 mL per group 3M HCl‚ 5 mL per group 6M HCl‚ 5 mL per group 3 pieces of zinc metal‚ each approx 1 cm × 1 cm 3 test tubes Part 4. Effect of a Catalyst 3% hydrogen peroxide‚ H2O2 – 10 mL per group 0.1 M iron(III) nitrate‚ Fe(NO3)3 0.1 M sodium chloride‚ NaCl 0.1 M calcium chloride‚ CaCl2 0.1 M potassium nitrate‚ KNO3 0.1 M manganese chloride‚ MnCl2 100-mL graduated cylinder 10-mL graduated cylinder 7 test tubes per group 1
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glowing splinter is ignited with violent flame and extinguished within 7 second . When the glowing splinter is pulled out ‚ it rekindled . Discussion The equation involved in this experiment is decomposition of hydrogen peroxide . H2O2 ( liquid ) → H2O ( liquid ) + O2 ( gas )
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3.3.2. Biologically treated POME From Fig. 9a and b‚ it is clear that there is no need of using high loading of C‚ N‚ S triple doped TiO2‚ TiO2-ZnO as maximum photoactivity can be achieved at 2 g/L. Even if high photocatalyst concentration is used‚ the degradation efficiency will be lowered. This result is in concord with the results of ........(2002) that the photodegradation of.....was relatively high at photocatalyst loading of ......and that high photocatalyst loading(RH > 10.6%‚ T = 318 K) hindered
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techniques to investigate the effect of different concentrations of the enzyme catalase on the rate of breakdown of hydrogen peroxide. Background information Catalase is an enzyme which is found in all living organisms. This enzyme catalases the decomposition of hydrogen peroxide into water and oxygen. Cells continually produce a poisonous by-product of metabolising‚ called hydrogen peroxide. This is very damaging to cells and is broken down as soon as it is formed in the cytoplasm into water and oxygen
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