The average rate of reaction at 2 mins for each of the five experimental runs would be 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!
The factors to discuss might be Theory of temperature effect Graph 4. Theory of concentration effect Graph 4. 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.
More marks are lost by not writing things down, than by not doing experiments! 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.
The time can be in minutes or seconds, as long as you stick to the same unit for a set of results for a set of experiments varying the concentration or mass of one of the reactants. However, they will cool a little standing out in the laboratory, so not completely satisfactory solution to the problem.
A few health and safety ideas on risk assessment AIM for a high investigation-project mark - you have nothing to lose for your assessment! The reaction is slower and only half as much gas is formed. If a gas is formed, there are at least two ways of collecting a gas e.
You would get a similar result by increasing the temperature of the reactants, as long as you measure the gas volume itself at the same temperature and pressure.
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.
The sodium thiosulphate-hydrochloric acid reaction, you can investigate the effects of temperature and concentration.
This web page is meant to teach you how to tackle an coursework e. 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.
More on this type of graph in introduction. BUT some of these values would be significantly different from the initial rate e.
If more experiments are conducted at another the time, the temperature must again be checked and recorded. Again, the graph becomes horizontal as the reaction stops when one of the reactants is all used up! Is there any other factor for the reaction you are studying?
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. Then, they will all be at the same temperature, which should be recorded.
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.
Then the experiment repeated with variations of the controlling factors producing different graphs e. This means the speed has become zero as the reaction has stopped. The initial gradient of the product-time graph e.A BRAINSTORM on "Rates of Reaction" for chemistry coursework investigations-projects.
Ideas for coursework assignments or projects involving the rates or speed of chemical reactions and is a companion page to see also the DETAILED GCSE Revision Notes on the Factors Affecting the Rates of Chemicals which also has brief descriptions of experimental methods and equations, particle pictures.
These revision notes are suitable for GCSE IGCSE O Level KS4 science chemistry students studying 'rates of reaction'. The descriptions of experiments to do with interpreting graphs from rates experiments and the theoretical explanations should help with homework, coursework assignments, laboratory experiments 'labs' on graph data from rates.
7|Page Anjelina Qureshi Mrs Gravell Rates of Reaction Coursework Chemistry Year 11 On my quadrant graph it shows that there is a negative correlation because the points are in.
Chemistry Rates of Reaction Coursework In: Science Submitted By karthiksree3 Pages GCSE Chemistry Coursework: Rates of Reaction Chemistry Table of Contents The graph shows that an increase in temperature will raise the rate of reaction, as will.
Rates of reactions science (chemistry) coursework My coursework is based on rates of reaction.
This deals with the time taken for reactants to be changed into products, when the variables are altered and analysed. thiosulphate and calcium carbonate, to use this method you can change the.
A secondary school revision resource for AQA GCSE Additional Science about chemical reactions, energy changes, rates of reaction and reversible reactions.Download