Antioxidants are used in the food industry to increase the shelf life of the foods. Antioxidants scavenge radicals by inhibiting initiation and breaking of chain reaction‚ suppressing formation of free radicals by binding to the metal ions‚ reducing hydrogen peroxide and quenching superoxide and singlet oxygen (Shi et al.‚ 2001). It is well known that herbs and spices possess anti-oxidant activity (Schwarz et al.‚ 2001; Tanabe et al.‚
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of chemical reaction. To describe how the concentration of an enzyme affects its ability to work. Hypothesis: Depending on the concentration of the catalase which the disk is soaked in‚ it will have a direct correlation on the rate of hydrogen peroxide being broken down into oxygen gas. Prediction: Since the rate of reaction can be lowered by the addition of catalysis such as an enzyme. Moreover to increase the effectiveness of an enzyme one must add additional amount of enzyme due to
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Introduction The purpose of this lab report was to test and measure the rate of substrate destruction by an enzyme‚ we tested the destruction of hydrogen peroxide by the enzyme catalase. Hydrogen peroxide is a poisonous by product of metabolism that can damage cells if it is not removed. Catalase is an enzyme that speeds up the breakdown of hydrogen peroxide into water and oxygen gas. H2O2 + catalase → H2O + O2 A catalyst is a substance that lowers the activation energy required for a chemical
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expressed mathematically by the rate law‚ this can not be determined by just looking at a chemical equation it has to be determined experimentally as done in this experiment. In this experiment we will be looking at the rate of the decomposition of hydrogen peroxide‚ which yields liquid water and gaseous oxygen. 2H2O2 (aq) 2 H2O(l) + O2(g) In this chemical reaction we will be examining the rate at which the product appears‚ in this case the rate at which oxygen gas is produced. This experiment will
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INVESTIGATION 12.A Target Skills Determining the reactivity of various metals Testing Relative Oxidizing and Reducing Strengths of Metal Atoms and Ions By observing whether reactions occur between solid metals and metal ions in solution‚ you can determine the order of oxidizing and reducing agents according to strength. Question How can the presence or absence of a reaction provide information about the relative strength of oxidizing and reducing agents? Safety Precautions
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CHEM 1405 Name:_____________________ Exam # 1 (Chap. 1- 3) Score: PART I – Multiple choice : (3 points each) -------1. What is the term for the study of the composition and properties of matter? a. geology b. chemistry c. alchemy d. physics -------2. Express 10‚000 as a power of 10. a. 103 b. 10-5 c. 104 d. 105 -------3. How many significant digits are in 0.0250 cm3? a. 5 b. 2 c. 3 d. 4 -------4
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Enzymes speed up chemical reactions and at the active site‚ a substrate can be broken down or two substrates can form a larger molecule. Hydrogen peroxide is broken down by peroxidase into water and oxygen which is released in the form of gas bubbles. If there is a large amount of bubbles‚ it means there is a large quantity of peroxidase breaking down the hydrogen peroxide. Denatured enzymes are enzymes whose shape has been altered and are no longer active (Wiggins). Ethanol is able to denature enzymes
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I: Reaction between iron and oxygen Appearance of steel wool after 20 minutes From (relatively) shiny metal strips to not-so-shiny strips that are stained with dark‚ reddish-brown stuff. Part II: Decomposition of hydrogen peroxide Appearance of potato and hydrogen peroxide combination: Lots of white‚ foamy bubbles around the potato slices. Day 2 Observations: Part III: Reaction between zinc and acetic acid Appearance of penny in vinegar after 30 minutes: Pretty dark
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Solution Purposes 1.To know the method of preparation and standardization of potassium permanganate standard solution. 2. To grasp the principle‚ the conditions and the method of permanganate titration. 3. To grasp the determination of hydrogen peroxide in hydrogen peroxide solution with permanganate method. Principle Permanganate titration with potassium permanganate solution (KMnO4) as standard solution is one of the oxidation-reduction titration methods. KMnO4 is a vigorous oxidant in an acidic solution
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measuring cylinder Equipment used: - Gas collecting kit - Potato - Stop watch - Test tube - Distilled water - Hydrogen peroxide - Knife Safety precautions: Dealing with corrosive chemicals “hydrogen peroxide” Method 1. Cut potatoes into 9 equal pieces. 2. Peel off skin. 3. Cut each potato chip into ascending order. 4. Add buffer of 4.8 ml. 5. Add 1.4 ml of hydrogen peroxide 6. Add potato chip & close bung. 7. Take measurement of gas after 2 minutes. 8. Repeat. Investigating the
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