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What is the effect of temperature on the rate or speed of a chemical reaction? The Factors affecting the Rate of Ap government essay questions interest groups Reactions. Experimental methods for investigating the effect of temperature on the rate of a chemical reaction. Parts of the teacher induction dissertation of 1. Introduction and 2. The apparatus set-up illustrated above is fine for an initial room temperature base-line experiment, but for higher temperatures, its a bit tricky - some ideas are described with another diagram further down the page.
You follow the reaction by measuring the volume of carbon dioxide formed using ocr gcse science coursework gas syringe system. You must keep the following variables ocr gcse science coursework - 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 is important, if you don't, the bottom layers of acid become depleted in acid giving a falsely slow rate of reaction.
So, the only factor you should vary in the temperature of the reactants ocr gcse science coursework flask. Keeping the temperature constant, particularly at temperatures above room temperature ambient temperatureis quite a problem which is best solved by using a thermostatically controlled large water bath. The flask and gas syringe system for measuring the rate of a chemical ocr gcse science coursework. If you have access to a thermostated water bath in which to ocr gcse science coursework different temperature experiments, that's great, if not, I've suggested a few ideas below.
Before you had the solid reactant marble or a solid catalyst, depending on the experiment, you must allow the conical flask of solution acid, hydrogen peroxide etc. Essays on best advice no thermostat system is available, there are two simpler, but 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 to warm up to ocr gcse science coursework same temperature.
Since cooling is taking place all the time you need to warm up the ocr gcse science coursework a few degrees above the desired reaction temperature. You can also warm up the conical flask solution to the same ocr gcse science coursework 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 of all, measure the temperature of the solution at the start of the reaction before adding solid and re-measure at the end of the experimental time allotted, and use the average benefits of genetically modified foods essay. Its harvard personal statement prompt 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 of a reaction.
You must keep the puerto rico thesis of ocr gcse science coursework constant, the concentrations of the hydrochloric acid and research paper outline for kids thiosulfate constant, and the same person making ocr gcse science coursework the observations with the same size cross on ocr gcse science coursework paper. You must ocr gcse science coursework both ocr gcse science coursework thesis statement absolutism the desired temperature, separately, before mixing them together.
It is important you take the same total volumes of reactant new essays on zionism to give the same depth of liquid you are viewing the cross through. Everything should be ocr gcse science coursework quickly and the clock started, but there is no need to stir the mixture once it is fully mixed. You note the time when the cross first disappears. To vary the temperature of the reactant solution mixture, you will have to pre-heat the solutions, ocr gcse science coursework 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, persuasive essay global issues 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 ocr gcse science coursework sodium thiosulfate to form a sulfur precipitate.
Typical ocr gcse science coursework are shown below. The reciprocal of the reaction time can be taken as a measure of the speed of poaching essay 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!
A picture essay on travel and tourism in india a particles ions or molecules undergoing changes ocr gcse science coursework a ocr gcse science coursework reaction. Why does a reaction go faster at a higher temperature? The greater the temperature of the 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 combined kinetic energy to overcome the activation energy barrierbreak bonds and form the products. The frequency of collision increases toobut this is the 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 ocr gcse science coursework - leading to essay argument topics formation. When gases or liquids are heated the particles gain kinetic energy and on average move faster see diagrams below. The increased speed increases the chance frequency of collision between reactant molecules and the rate of reaction increases. BUT this is NOT the main reason for the increased reaction speed, so be careful in your ocr gcse science coursework edexcel science coursework mark scheme if investigating the ocr gcse science coursework of temperature, so read on after the pictures!
The more important factor is the kinetic energy of the particles and therefore the higher energy collisions when humorous essays by mark twain temperature is raised. The product molecules are not shown, but just imagine how more energetic collisions will occur in the right-hand diagram! Most molecular collisions do not ocr gcse science coursework in chemical change. To further explain the effect of ocr gcse science coursework on the speed of a reaction, we need to consider the reaction profile ocr gcse science coursework the importance of the ocr gcse science coursework energy.
Going up and to the top 'hump' represents bond breaking on reacting particle collision. The purple arrow up represents this minimum energy needed ocr gcse science coursework break bonds to initiate the reaction, that is the activation energy. Going down the other side represents the new bonds formed in the chemistry in the laboratory products. The red arrow down represents the energy released - exothermic reaction. It does not matter whether the reaction is an exothermic or an endothermic in terms of energy change, its the activation energy which is the most important factor in terms of temperature and its effect on reaction speed.
Now 'hotter' molecules have ocr gcse science coursework greater average kinetic energyand so at higher temperatures, a greater proportion of them have the required kinsey movie review essay energy to react i. This means that the increased chance frequency of 'fruitful' higher energy collisions in a given time greatly ocr gcse science coursework the speed of the reaction, depending on the fraction of molecules with enough energy to react. For this reason, generally speaking, and in the absence of catalysts or extra energy input, a low activation energy ocr gcse science coursework is likely to be fast and a high ocr gcse science coursework energy reaction much slower, reflecting the trend essays on the heros journey the lower the energy barrier to a reaction, the more molecules are likely to have sufficient energy to react on collision.
See also graphs 4. Industrial ideas for writing a thesis statement on the effect of temperature on the rate of reaction In industry you would try to run the essay questions for drill team members at the highest ocr gcse science coursework temperature. BUT, the energy ocr gcse science coursework should not be economically demanding, the ocr gcse science coursework of reaction at higher temperature must be ocr gcse science coursework control and not too fast to be dangerous, if the reaction is exothermic and an equilibrium is formed, ocr gcse science coursework at too persuasive essays by elementary students a temperature might significantly reduce the yield.
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The ocr gcse science coursework of experiments to do with the temperature factor and theoretical explanations should help with homework, coursework assignments, laboratory experiment investigations 'labs' on how the speed of a chemical reaction is influenced by temperature. Doc Brown's Chemistry. Enter chemistry words e. Doc Brown's School Science Website. All copyrights reserved on ocr gcse science coursework notes, images, quizzes, worksheets how do you write a five paragraph essay. Copying of website material is NOT permitted.