Rate of Reaction The rate of a reaction is the speed at which a chemical reaction happens. If a reaction has a low rate, that means the molecules combine at a slower speed than a reaction with a high rate. Some reactions take hundreds, maybe even thousands, of years while others can happen in less than one second. If you want to think of a very slow reaction, think about how long it takes plants and ancient fish to become fossils (carbonization). The rate of reaction also depends on the type of
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substances which lower the activation energy required for a chemical reaction to occur and therefore increases the rate of the reaction. Activation Energy is the minimum energy barrier needed to be overcome before a reaction can occur by providing an alternative reaction pathway. The beneficial aspect of enzymes is that they are extremely efficient and may be used repeatedly. One enzyme may be used to catalyze thousands of reactions every second. The two factors that affect the efficiency of how enzymes
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Allosteric enzymes are "enzymes that change their conformational ensemble upon binding of an effector, which results in an apparent change in binding affinity at a different ligand binding site." The mechanism of working of these enzymes is called "action at a distance". The effector molecules bind to a site called the allosteric site, which is different from the active site at which the substrate binds. The allosteric activators are the effector molecule increasing the enzyme activity through protein
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As the elements went down Group I, the reactions became quicker and more reactive. This is because of the decreasing electronegativity. Each element in this group has one valence electron each, but a different number of shells. The increasing number of shells means that the valence electron surrounding the nucleus of the atom gets farther away as the elements go down the group. The electron experiences less of a pull towards the nucleus, so the atom can give the electron away a lot easily. This gives
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1. Which of the variables in the second flux equation, J = 푃퐴(퐶퐼 − 퐶2), will be manipulated during the lab? In this lab, the concentration gradient across the membrane, (퐶퐼 − 퐶2), is the variable. Since we are using the same solute and membrane manipulated, P, the permeability coefficient of the solute across the membrane is constant. A, the membrane area, is also constant since we are using the same cell for all different concentrations. In this case, the concentration gradient across the membrane
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After it was first discovered in 1886 by Hans Heinrich Landolt, the iodine clock reaction has become one of the most used classroom experiments for demonstrating kinetics (SuperchargedScience, 2018). A clock reaction is a reaction where one of the chemical species (clock chemical) starts off with a low concentration and then has a rapid increase which can then lead to a dramatic colour change (UnitverityNottingham, 1999). The iodine clock works by using iodine as the clock chemical that then reacts
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Reaction Rates 1.1 The toasting of bread us a chemical reaction. Reactions occur whenever new substances with different properties are formed. Some reactions occur very slowly. For example, the chemical weathering of rocks can take thousands of years. The rusting of iron and the decay of dead pant and animals both involve slow reactions. The digestion of food is much faster, but it still takes 3-5 hours to digest a meal. If you cut yourself, it takes a few minutes for your blood to clot. At
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Write your name here Surname Other names Centre Number Candidate Number Edexcel GCE Chemistry Advanced Unit 4: General Principles of Chemistry I – Rates, Equilibria and Further Organic Chemistry (including synoptic assessment) Monday 14 January 2013 – Afternoon Time: 1 hour 40 minutes You must have: Data Booklet Candidates may use a calculator. Paper Reference 6CH04/01 Total Marks Instructions Use black ink or ball-point pen. Fill in the boxes at the top of this page with
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GCSE Chemistry Coursework : Rates of Reaction Chemistry Table of Contents Table of Contents 1 Strand Sa 2 The Science 2 Variables 2 Temperature 2 Concentration 2 My Prediction 3 Strand Sb 3 Risk Assessment. 3 Preliminary Equipment 4 Preliminary Method 6 Strand C 7 Preliminary Data 7 Main Method 8 Main Results. 9 Strand Ea 9 Problems Encountered when collecting data. 9 Alternate Methods 10 Light Meter 10 Gas Collection 10 Strand Eb 11 Data Analysis
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A grade GCSE chemistry coursework - Rates of Reaction Decomposition of Sodium Thiosulphate This is an investigation about the decomposition of sodium thiosulphate. There are many factors (variables) which determine how fast or slow the reaction can take place (rate of reaction). These are: * Initial volume of sodium thiosulphate. * The initial volume of hydrochloric acid. * The initial volume of water. * The temperature of the reaction mixture. * The concentration of the sodium
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