Essay ON PAcemaker A pacemaker (or artificial pacemaker‚ is a medical device that uses electrical impulses‚ delivered by electrodes contacting the heart muscles‚ to regulate the beating of the heart. The primary purpose of a pacemaker is to maintain an adequateheart rate‚ either because the heart’s native pacemaker is not fast enough‚ or there is a block in the heart’s electrical conduction system. Modern pacemakers are externally programmable and allow the cardiologist to select the optimum pacing
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ELECTRONEGATIVITY This page explains what electronegativity is‚ and how and why it varies around the Periodic Table. It looks at the way that electronegativity differences affect bond type and explains what is meant by polar bonds and polar molecules. If you are interested in electronegativity in an organic chemistry context‚ you will find a link at the bottom of this page. What is electronegativity Definition Electronegativity is a measure of the tendency of an atom to attract a bonding pair
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Volumetric Analysis of Vitamin C by Titration The objective of this experiment is to use a redox reaction titration to accurately determine the amount of vitamin C in a sample of lemon juice‚ orange juice‚ or grapefruit juice. Chemistry of Vitamin C The chemical name for vitamin C is L-ascorbic acid. Its molecular formula is C6H8O6; its molar mass is 176.12 g/mole. Ascorbic acid is found throughout the plant and animal kingdoms‚ occurring in citrus fruits‚ hip berries (such as rose
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+ I2 Br2 + 2I- ( 2Br- + I2 • Down the group the outer electron is further from nucleus and more shielded so gained less easily 3) Trends in properties of the halides • The halides (chlorides‚ bromides and iodides) are reducing agents which lose an electron when they react • The ability to act as a reducing agent increases down the Group • Down the group the outer electron is further from nucleus and
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HKDSE CHEMISTRY – A Modern View (Chemistry) Experiment Workbook 5 Suggested answers Chapter 52 Importance of industrial processes Chapter 53 Rate equation Experiment 53.1 Determining the rate equation of a reaction using method of initial rate (A microscale experiment) 1 Chapter 54 Activation energy Experiment 54.1 Determining the activation energy of a chemical reaction 3 Chapter 55 Catalysis and industrial processes Experiment 55.1 Investigating the action of a catalyst 6 Experiment
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Available online at www.pelagiaresearchlibrary.com Pelagia Research Library European Journal of Experimental Biology‚ 2012‚ 2 (2):385-388 ISSN: 2248 –9215 CODEN (USA): EJEBAU Effect of cooking on amylose content of rice ______________________________________________________________________________ ABSTRACT In diabetes type 2‚ there is a deficiency of insulin which results in improper/ slow breakdown of food. This results in sugar level spikes immediately after a meal‚ which can be
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Agriculture is one of the most crucial necessities all around the world. The amount of food grown and sold affects the resources that are used in production. To sustain life you need food but most people are blinded to what actually happens in all the stages of growth. With technology advancing the way it is it has become hard to trust your food and its purity and cleanliness. People don’t get deep into where all their food comes from. It starts from the farms. Depending on what type of farm you
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Examining Diffusion and Osmosis Introduction: Purpose: 1. To simulate and observe the diffusion of solutes and the osmosis of water through a semipermeable membrane through color change and sugar tests. 2. To speculate osmosis occurring in dialysis bags and potato cores by comparing percentage change in masses. Background information: Molecules are always in random‚ constant movement due to their kinetic energy. This causes the molecules of a cell to move around and bump into each other
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Cognitive development is an intellectual growth from infancy to adulthood. Jean Piaget (1896-1980)‚ a Swiss psychologist‚ was one of the most important and influential researchers in the field of developmental psychology throughout the 20th century. Piaget was born in Neuchâtel‚ Switzerland‚ on August 9‚ 1896. His father‚ Arthur Piaget‚ was a professor of medieval literature with an interest in local history. His mother‚ Rebecca Jackson‚ was intelligent and energetic. The oldest child‚ he was very
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Abstract: Enzymes are specific-type proteins that act as a catalyst by lowering the activation energy of a reaction. Each enzyme binds closely to the substrate; this greatly increases the reaction rate of the bounded substrate. Amylase enzyme‚ just like any other enzyme‚ has an optimum PH and temperature range in which it is most active‚ and in which the substrate binds most easily. The purpose of this experiment was to determine (1) the reaction rate of an amylase enzyme in starch and (2)
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