Affect of enzyme concentration to the rate of reaction Aim: With the experiment of protein solution‚ in this case egg white added to different pepsin concentrations (0%‚ 0.2%‚ 0.4%‚ 0.6%‚ 0.8%‚ 1.0%) shows‚ as the egg white is a protein and the pepsin works as an enzyme‚ how a higher pepsin concentration and therefore a larger amount of enzymes effect the rate of reaction. Hypothesis: An increased concentration of pepsin speeds up the time the mixture needs to come clear. Introduction:
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their two advantages . [2.0] 4] Chemical kinetics deals with rates of chemical reactions [4 marks] A] Give two differences between order and molecularity of a chemical reaction [1.0] B] Draw a graphical representation to show the effect of a positive catalyst on the activation energy[1.0] C] How rate of reaction increases with increase in temperature ? [1.0] D] What is the half life of a first order reaction whose rate constant is 200 s−1? [1.0] 5]Colloids are heterogeneous systems [3 marks]
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pancreas and saliva of higher animals. Aim The aim of this experiment is to find out the rate of reaction between amylase and starch in a range of different reaction temperatures. Hypothesis As the reaction temperature of amylase solution and starch solution increase‚ the reaction rate of amylase and starch will increase. After reach the optimal temperature of amylase‚ the reaction rate of amylase and starch will rapidly decrease. The lock and key model explains my hypothesis
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questions and carry 5 marks each. (vii) Use Log Tables‚ if necessary‚ Use of calculators is not allowed. QUESTION PAPER CODE 56/1/1 1. 2. 3. 4. 5. 6. Write a feature which will distinguish a metallic solid from an ionic solid. Define ‘order of a reaction’. What is an emulsion? Why does NO2 dimerise ? Give an example of linkage isomerism. A solution of KOH hydrolyses CH3CHClCH2CH3 and CH3CH2CH2CH2Cl. Which one of these is more easily hydrolysed? Draw the structural formula of I-phenylpropan-l-one
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‘HOW DOES CONCENTRATION AFFECT THE RATE OF REACTION?’ SANIA HUSSAIN CANDIDATE NUMBER:5093 Contents The aim – PG 1 Introduction – PG 1 Theories – PG 1‚ 2 Prediction – PG 2‚ 3 Safety – PG 3 Strategy – PG 3‚ 4 Method – PG 5‚ 6‚ 7 Preliminary – PG 7 Actual experiment and graphs – PG 7+ Chemistry coursework Hypothesis/Aims The aim of the investigation is to see how different concentrations of hydrochloric acid affects the rate at which hydrogen gas is produced
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that speed up chemical reactions without being destroyed or altered during the process. Enzymes are extremely efficient and may be used over and over again. One enzyme may catalyze thousands of reactions every second. At the start of the reaction‚ there is no product‚ and the concentration is the same as the atmosphere. After a short time‚ oxygen accumulates at a rather constant rate. The slope of the curve at this initial time is constant and is called the initial rate. As the peroxide is destroyed
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CARIBBEAN EXAMINATIONS COUNCIL Caribbean Advanced Proficiency Examination CAPE ® CHEMISTRY SYLLABUS Unit 1 - effective for examinations from May/June 2007 Unit 2 - effective for examinations from May/June 2008 CXC A11/U2/06 Published by the Caribbean Examinations Council All rights reserved. No part of this publication may be reproduced‚ stored in a retrieval system‚ or transmitted in any form‚ or by any means electronic‚ photocopying‚ recording or otherwise without prior permission
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Controlled assessment- How concentration affects the rate of reaction between sodium thiosulfate and hydrochloric acid. SA): Strategy Scientific knowledge Sodium thiosulfate (Na2S2O3)‚ also spelled sodium thiosulphate‚ is a colourless crystalline compound that is more familiar as the pentahydrate‚Na2S2O3·5H2O‚ an efflorescent‚ monoclinic crystalline substance also called sodium hyposulfite or “hypo.” Sodium thiosulphate has a melting point of 48 degrees C. It is freely soluble in water. It contains
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food packaging to appliances to manufacturing (Maier). On an industrial scale‚ polystyrene is derived from its monomer‚ styrene. This is achieved by free-radical polymerization of a solution of monomer‚ polymer‚ and initiator. This reaction is a multistep radical reaction that includes initiation‚ propagation‚ and termination (Eq.B.1 through Eq.B.5). Figure A.1 shows a process that produces 1000 kg/hr of polystyrene in an isothermal plug flow reactor at a styrene conversion of lower than 80%. Azobisisobutyronitrile
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velocities the scale growth rate is enhanced by an increase in fluid velocity due to the mass transfer-controlled scale growth. At higher fluid velocities‚ the scale growth rate decreases with increasing fluid velocity due to the increased flow erosion effect‚ for slurry systems. This suggests the potential of particulate erosion as a scale suppression mechanism. The model predicts the existence of an optimal slurry flow velocity‚ where scaling rate and equipment erosion rate are both zero. The optimal
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