Gcse Chemistry Coursework Rates of Reaction Text

use the sources/references mentioned below and clearly indicate them in your write up. more marks are lost by not writing things down, than by not doing experiments! your write up must be your work produced from your study and your experiments. this web page is meant to teach you how to tackle an coursework e.g. On rates, it is not meant to be copied and the details filled in! your coursework write up must expressed in your language and expressed at 'your scientific level'.

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your teacher will have a good idea what to expect and you must be able to justify all your write up. more marks are lost by not writing things down, than by not doing experiments! email a query or comment on the rates/coursework ideas pages but i do not do students coursework for them. By writing up how, and why, you have changed the experimental conditions or 'recipes' you can gain more marks.

Skill p: planning the theory and your experiment design! first, you can start by describing the reaction situation you are intending to investigate e.g. With the word and symbol equation, short description about the reaction, and this sets the scene. If you are confident and chosen the variable you want to investigate you should try to make a prediction and maybe justify it with some theory if you can. You can continue in a broader context by introducing some background theory and descriptions of the factors or variables which may have an effect on the rate of the reaction you are studying include briefly factors which might not apply. Size of limestone pieces? relate to surface area? , stirring of the reacting mixture, size of reaction vessel, volume of thiosulphate, any added water to dilute etc.

Will any of the reactants or products be affected by change in temperature or pressure? e.g. There are several reasons why the same acid should be used if its a reactant in the investigation, e.g. Is the active ingredient that actually 'attacks' the metal or carbonate, and acids can ionise to different extents, 2 1 molar or 1 mol dm 3 1m h₂ so₄ is twice as acid as 1m hcl because each h₂ so₄ provides 2 h + 's whereas each hcl just 1. If you have decided, for example, to investigate the effect of acid concentration on the speed of a reaction, then everything else should be kept constant for a fair test, and this should be obvious in your plan for the reasons discussed above! if you haven't already chosen the variable, do so now, and make a prediction and justify it with some theory which you may have previously described and should refer to. Initially empty gas syringe or a measuring cylinder/burette full of water inverted over water with appropriate tube connections and there is one other very different method available for 'following' the reaction using a balance to record the mass loss. The hydrochloric acid sodium thiosulphate reaction depends on the time for a certain amount of sulphur precipitate to form and obscuring a marked black x on white paper. briefly explain how the method can be used to measure the speed the results of the first few minutes is usually the most crucial you can discuss briefly other methods, but perhaps better in evaluation as a means of further evidence.

when you have decided on the method, give a detailed description of how you might carry it out. Include details of the amounts of chemicals you might use mass, volumes, dilutions + units etc. Clearly indicate why the method would be expected to produce precise and reliable evidence the results! include 'health and safety' points. If you are looking at changing the reaction temperature, its not easy to accurately vary and control the temperature of the reactants without a thermostated water bath to hold the reaction flask in. Even with a thermostated water bath normally only available to advanced level students , all the reactant solutions should be pre warmed in the bath before mixing and start the timing and recoding of results. If you are varying temperature, you need to heat up the reactant solutions separately and take their temperatures, mix, start stopwatch. However, they will cool a little standing out in the laboratory, so not completely satisfactory solution to the problem.

12Th Mp Board Model Paper English Medium

In the case of the sodium thiosulphate acid reaction, you can leave the thermometer in the flask and take the temperature at the end, then use an average for the temperature of the reaction. The simplest solution here, is to make sure all the chemicals have been standing in the laboratory prior to the lesson. If more experiments are conducted at another the time, the temperature must again be checked and recorded.

Refer to any previous laboratory experience with 'rate of reaction' experiments which may have helped you decide and design the experimental method. A clearly labelled diagram of the method with a brief outline of how you intend to carry out the experiments this cuts down on the writing and makes the scene clear! you must give details of how long you might time the experiment as well as the time interval between experimental readings remember you can change your 'recipe' or way of doing the experiment. length: 1851 words 5.3 double spaced pages rating: red free rate of reaction coursework aim: to investigate how temperature affects rate of reaction. Introduction: i am going to investigate how temperature affects the rate of reaction of hydrochloric acid with calcium carbonate. The rate of reaction can be measured in various different ways: using a balance you can check the mass before the reaction and then after the reaction has taken place. Then check the change in you can also use the method of obscuring a cross with sodium thiosulphate and time which cross becomes invisible first.