Planning - the theory and your experiment design!
Planning - the theory and your experiment design! For example, with the word and symbol equation, short description about the reaction, and so on.
This sets the scene. If you are confident and chosen the VARIABLE you want to investigate you should try to make a quantative 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.
In your 'method' description use the correct units or descriptors. The factors to discuss might be: Example of the theory is the factors will increase the molecules inside the chemical and it will eventually increase the rate of reaction.
Is there any other factor for the reaction you are studying? 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. If a gas is formed, there are at least two ways of collecting a gas e. 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.
Clearly indicate why the method would be expected to produce precise and reliable evidence - the results! Complete a full risk assessment. 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 studentsall 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. 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.
If temperature isn't a variable, it must be kept constant. The simplest solution here, is to make sure all the chemicals have been standing in the laboratory prior to the lesson. Then, they will all be at the same temperature, which should be recorded.
If more experiments are conducted at another the time, the temperature must again be checked and recorded.Four Factors which affect Rates of Reaction: Surface Area - Surface area is the measure of how much exposed area a solid object has, Evaluation: One of the weaknesses of the trial run was that the person recording the time changed and this could of lead to slight deviation in the result.
However, other factors like the room. Chemistry rate of reaction coursework – GCSE Science – Marked by Plan I am going to produce a piece of coursework investigating the rate of reaction, selecting a variable to see how this affects the rate.
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.
Chemistry Rates of Reaction Coursework In: Science Submitted By karthiksree3 GCSE Chemistry Coursework: Rates of Reaction Chemistry when collecting data. 9 Alternate Methods 10 Light Meter 10 Gas Collection 10 Strand Eb 11 Data Analysis 11 Graph Evaluation 11 Strand Ra 12 Secondary Data 1 12 Secondary Data 2 13 Secondary Data 3 Jul 02, · A grade GCSE chemistry coursework, Rates of reaction, Decomposition of sodium thiosulphate, introduction, method, safety, results, discussion.
Sodium thiosulphate decomposition for GCSE, grade a heartoftexashop.coms: Note that if the temperature of a rates experiment was too low compared to all the other experiments, the 'double error' would occur again, but this time the measured gas volume and the calculated speed/rate of reaction would be lower than expected.