Obtaining evidence - observations, measurements, in other words the results! Even with a thermostated water bath normally only available to advanced level studentsall the reactant solutions should be pre-warmed in the bath before mixing and start the timing and recoding of results.
More marks are lost by not writing things down, than by not doing experiments!
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! 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.
Your write-up must be your work produced from your study and your experiments. Word process your work if you can and your results can be tabulated and processed into graphs using software packages like Excel Preliminary work usually involves doing a few trial runs of the experiment to see how it goes and making modifications if necessary.
If a gas is formed, there are at least two ways of collecting a gas e. If you are varying temperature, you need to heat up the reactant solutions separately and take their temperatures, mix, start stopwatch.
Enzyme catalysed reactions e. 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.
This web page is meant to teach you how to tackle an coursework e. When you have decided on the method, give a detailed description of how you might carry it out.
However, they will cool a little standing out in the laboratory, so not completely satisfactory solution to the problem. A BRAINSTORM outline of a whole investigation is outlined below, it is not meant to be prescriptive, but can form the basis of aiming for a high mark and hopefully give you plenty of ideas.
Is there any other factor for the reaction you are studying? The simplest solution here, is to make sure all the chemicals have been standing in the laboratory prior to the lesson. Planning - the theory and your experiment design! Clearly indicate why the method would be expected to produce precise and reliable evidence - the results!
If more experiments are conducted at another the time, the temperature must again be checked and recorded. Then, they will all be at the same temperature, which should be recorded.
The factors to discuss might be A few health and safety ideas on risk assessment AIM for a high investigation-project mark - you have nothing to lose for your assessment! 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.
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.
Decomposing hydrogen peroxide with a solid catalyst or soluble transition metal compound. The sodium thiosulphate-hydrochloric acid reaction, you can investigate the effects of temperature and concentration. Your teacher will have a good idea what to expect and you must be able to justify all your write-up.
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.Chemistry Coursework A Timer to measure the time for the reaction to take place and to make sure all our data was recorded at the right intervals so our experiment is more accurate and is a fair test.
Enthalpy 2|Page Anjelina Qureshi Mrs Gravell Rates of Reaction Coursework Chemistry Year 11 Enthalpy, in chemistry, is the heat content in a chemical reaction.
The enthalpy change is the amount of heat absorbed or released when a chemical reaction occurs at a constant pressure. GCSE. Chemistry (Single Science) Chemistry is the study of the composition, behaviour and properties of matter, and of the elements of.
Sodium thiosulfate solution is reacted with acid – a sulfur precipitate forms. The time taken for a certain amount of sulfur to form can be used to indicate the rate of the reaction. GCSE. GCSE resources with teacher and student feedback.
Popular GCSE Subjects; Biology (3,) Business Studies (3,) Rate of Reaction Chemistry Coursework. Concentration- The higher the concentration, the faster the rate of reaction. This is because there are more particles in the same amount of space.4/5.
GCSE Chemistry Coursework: Investigating the rate of a reaction Your task is to plan, and carry out, an experiment to discover how to change the rate the reaction between sodium thiosulphate solution and dilute hydrochloric acid.Download