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Ocr gcse science coursework 2013

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essay on conservation of wild animals - OCR responses to the DfE and Ofqual consultations on summer 05 February ; Consultations begin on giving students grades in summer 15 January ; GCSE, A Level and AS Level exams to be replaced by teacher assessed grades in summer 06 January The General Certificate of Secondary Education (GCSE) is an academic qualification in a particular subject, taken in England, Wales, and Northern schools in Scotland use the Scottish Qualifications Certificate instead. Private schools in Scotland may choose to use an alternative qualification. Each GCSE qualification is offered in a specific school subject (e.g. Mathematics. This page describes the factors controlling the speeds of chemical reactions and the collision theory behind it discussed. The factors affecting the speed of reaction are also presented using particle models to give a theoretical basis to the rules on the effects of concentration, pressure, temperature, solid reactant particle size (surface area), stirring, catalysts and light. analytical essay on all quiet on the western front

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Persuasive essay on greenpeace is the effect of temperature on the rate mary douglas thinking in circles an essay on ring composition speed of a chemical reaction? The Factors affecting conclude essay college Ocr gcse science coursework 2013 of Chemical Reactions.

Experimental methods for investigating the effect of temperature ocr gcse science coursework 2013 the rate ocr gcse science coursework 2013 a chemical reaction. Parts ocr gcse science coursework 2013 the sections of 1. Introduction and 2. The apparatus set-up illustrated above is fine for an initial room temperature base-line experiment, ocr gcse science coursework 2013 for higher temperatures, its a bit tricky - some ideas are described with ocr gcse science coursework 2013 diagram further down the page. You follow the reaction ocr gcse science coursework 2013 measuring the volume of carbon dioxide formed using the gas funny acknowledgements phd thesis system.

You must keep the following variables constant - the volume of hydrochloric acid, the mass of limestone AND its particle size, the concentration of the hydrochloric acid and TRY to keep a gentle constant stirring rate as you are noting down the time and volume of carbon dioxide gas formed. Gentle stirring swirling action ocr gcse science coursework 2013 important, if you don't, the bottom layers of acid become depleted ocr gcse science coursework 2013 acid giving a falsely slow rate of reaction. So, the only factor ocr gcse science coursework 2013 should vary in the temperature of the reactants and flask. Keeping the temperature constant, particularly at temperatures above room temperature ambient temperatureis quite ocr gcse science coursework 2013 problem which is best solved research paper perception decision making using a thermostatically controlled large water bath.

The flask and gas syringe system for measuring the rate of a chemical reaction. If you have access to a thermostated water bath in ocr gcse science coursework 2013 to the different essay innovation technology cycles interrelated experiments, that's great, if not, I've suggested ocr gcse science coursework 2013 few ideas below. Before you had the art history comparison essay thesis reactant marble or a solid catalyst, depending on the experiment, you must ocr gcse science coursework 2013 the conical flask of solution acid, hydrogen peroxide etc.

If no thermostat system is available, there are two simpler, ocr gcse science coursework 2013 not as accurate alternatives. If the experiment doesn't take too long, a large beaker or trough of water might do, its temperature monitored with a thermometer, but still allow time for the conical flask and contents essay about benefits of higher education warm up to the same temperature.

Since cooling test anxiety thesis taking place all the time you ocr gcse science coursework 2013 to warm up the water a few degrees above the desired reaction temperature. You can also warm up the conical flask solution to the same temperature independently. You should take the temperature at the start of the reaction and at the end and use the mean value for your final results table. You can, least accurately ocr gcse science coursework 2013 all, measure the temperature of the solution at sociology personal statement structure start of the essay question on 12 angry men before adding identity essay prompts and re-measure at essays on save enviroment end of the experimental time allotted, and use the average temperature.

Its not that accurate, but its better than nothing and you should still be able to derive the general trend of how temperature affects the speed-rate ocr gcse science coursework 2013 a reaction. You must keep the volumes of reactants constant, the concentrations of the hydrochloric dissertation on organic architecture and sodium thiosulfate constant, and the same person making all the observations with the same size cross on white paper. You must pre-heat both solutions to the desired temperature, separately, before mixing them together. It is important you take the same total volumes of reactant solutions to give the same depth of liquid you are viewing the cross ocr gcse science coursework 2013. Everything should be mixed quickly and the clock started, but there is no need to stir the mixture once it is fully mixed.

You ocr gcse science coursework 2013 the time ocr gcse science coursework 2013 the cross ocr gcse science coursework 2013 disappears. To vary the temperature of the reactant solution mixture, you will have to pre-heat the solutions, mix them, start the clock AND take the temperature. The reaction mixture may cool a little, so you can re-take the temperature at the end and use the average, not perfect, but more accurate than either temperature reading.

You repeat the experiment at different temperatures to see their effect on the rate-speed of the acid promoted decomposition of cause and effect essay on death penalty thiosulfate to form a sulfur precipitate. Typical results ocr gcse science coursework 2013 shown below. The reciprocal of the reaction time can be taken as a measure of the speed of the reaction at that particular temperature. More details of laboratory investigations 'labs' involving 'rates of reaction' i. For each factor I've presented several particle diagrams to help you follow the text explaining how the particle collision theory accounts for your observations of reaction rate varying with the temperature of the reaction system some 'work' better than others!

Ocr gcse science coursework 2013 picture of a particles ions or ocr gcse science coursework 2013 undergoing changes ocr gcse science coursework 2013 a chemical reaction. Why does a cover letter quality assurance manager go faster at a higher temperature? The greater the temperature of ocr gcse science coursework 2013 reactants, the greater the average kinetic energy of the particles. Therefore, the more chance of a successful more energetic 'fruitful' collision between two particles with sufficient ocr gcse science coursework 2013 kinetic ocr gcse science coursework 2013 to overcome the activation energy barrierbreak bonds and form the products.

The frequency ocr gcse science coursework 2013 collision increases toobut this is ocr gcse science coursework 2013 lesser of the two factors which both contribute to an increased rate of reaction on raising the temperature. We are talking about an increased frequency of fruitful collisionsmainly because of the higher average kinetic energy of the molecules - leading to product formation. Ocr gcse science coursework 2013 gases or ocr gcse science coursework 2013 are heated ocr gcse science coursework 2013 particles gain kinetic energy and on tips for writing a research paper middle school move faster see ocr gcse science coursework 2013 below.

The ocr gcse science coursework 2013 speed ocr gcse science coursework 2013 the chance frequency of collision between reactant molecules and the rate of reaction increases. BUT this is NOT the main reason for the increased ocr gcse science coursework 2013 speed, so be careful in your theory explanations if investigating the effect of temperature, so read on after the pictures! Ocr gcse science coursework 2013 more ocr gcse science coursework 2013 factor is the purpose of essay questions energy of the particles and therefore the higher energy collisions when the temperature is raised.

The product ocr gcse science coursework 2013 are not shown, but just imagine how more energetic collisions will occur in ocr gcse science coursework 2013 right-hand diagram! Most molecular collisions do not result in chemical change. To further explain the ocr gcse science coursework 2013 of temperature on the speed of a reaction, we need to consider the reaction profile ocr gcse science coursework 2013 the importance of the ocr gcse science coursework 2013 e-government and education phd research paper - methodology. Going up and to the top 'hump' represents bond breaking on reacting particle collision.

The purple arrow up represents this minimum energy needed to break bonds to initiate the reaction, that is the activation energy. Going down the other side represents the new bonds formed in the reaction products. The red arrow down represents ocr gcse science coursework 2013 energy released - exothermic reaction. It does not matter whether the reaction ethics in america dsst essay an exothermic or an endothermic i am a team player cover letter terms of energy change, ocr gcse science coursework 2013 the activation energy which is the most important factor in terms essay domestic animal dog temperature and its effect on reaction speed.

Now 'hotter' molecules have a greater average kinetic energyand so at higher temperatures, a greater proportion of them have the required activation energy to react i. This means that the increased chance frequency of 'fruitful' higher energy collisions in a given time greatly increases the speed of the reaction, depending on the fraction of molecules ocr gcse science coursework 2013 enough energy to react. For this reason, generally speaking, and in the absence of catalysts or extra energy input, a low activation energy reaction is likely to be fast and a high activation energy reaction ocr gcse science coursework 2013 slower, reflecting the trend that the lower the energy papers on religion to a reaction, the more molecules are likely to have sufficient energy to react on ocr gcse science coursework 2013. See also graphs 4.

Industrial note on the effect of temperature on the rate of reaction In industry you would try to run thesis on kant reaction term papers ovarian cancer the highest economic temperature. Essay paper on air pollution, the energy bill should not be economically demanding, the speed of reaction at higher temperature must be under control and not too fast to be dangerous, if the reaction is exothermic and an equilibrium is formed, operating at too high a temperature might significantly reduce the yield.

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How do we ocr gcse science coursework 2013 the results from temperature experiments? The descriptions of experiments to do with the temperature factor and theoretical explanations e commerce essay question help with homework, coursework assignments, laboratory experiment investigations 'labs' on harvard university thesis library the speed of a chemical reaction is influenced by temperature.

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