In order to get maximum marks in this coursework it is vital that you discuss all factors which affect the rate of a reaction. First, you can start by describing the reaction situation you are intending to investigate.
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 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. 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. 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.
Observations, measurements, in other words the results! Possibly some data you might have been given secondary data. Repeat corrected gas volume??? All experiments should be repeated where time allows checking for accuracy and consistency; this may become more necessary after you have done a preliminary analysis The 'bung effect'! Your recorded results should indicate the accuracy of the measuring equipment e. Some of the work done here in presenting the results, e. Harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing, show more.
Help with rates of reaction coursework Hydrochloric acid and Sodium Thiosulphate? I am doing coursework on the rate of reaction between Hydrochloric acid and Sodium Thiosulphate To avoid confusing I will describe the test I tried and then will tell the problems I had. I took 20ml of both Hydrochloric acid and Sodium Thiosulphate. I used a conical flask and a delivery tube to take the gas formed into a tube of water to measure the amount it displaces in 60 seconds. Here are the problems i faced: So I had a quick think about it and I was completely stumped.
The only thing I can think to do is find out the theoretical yield and balanced equation to get a better understanding but I really need help. Are you sure that you want to delete this answer? In this reaction you are supposed to use the cloudiness to measure the progress of the reaction. The cloudiness is due to the precipitate of sulphur that forms. You're right about the sulphur dioxide.
It's highly soluble in water, and won't bubble off as a gas. That's because your concentration of thiosulphate was so low. Usually, people place the conical flask on top of a printed page, or a black cross, or something that they can observe getting slowly obliterated as the solution turns cloudy. The dependent variable is the time taken for the cloudiness to be enough to hide the marks on the paper.
Will you have the chance to do it again? I suggest you use 0.
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.
- Rates of Reaction Coursework. Introduction. In this piece of science coursework I will be experimenting how the rate of reaction between Sodium thiosulphate and hydrochloric acid is affected by the concentration of Sodium thiosulphate.
- The Rate of Reaction Introduction ===== The rate of reaction is how fast/the speed at which a chemical reaction takes place. The rate of reaction is found by measuring the amount of a reactant used up per unit of time or the amount of . Rates of reaction: sodium thiosulphate hydrochloric acid Rates of reaction: sodium thiosulphate hydrochloric acid Plan: We must produce a piece of coursework investigating the rates of reaction, and the effect that changing one particular variable has on A grade GCSE chemistry coursework – Rates of reaction A grade GCSE .
The rate of a chemical reaction is a measure of how fast the reaction takes place. It is important to remember that a rapid reaction is completed in a short period of time. An example of a fast reaction is an explosion, and an example of a slow reaction is rusting/5(2). The rate of reaction is the rate of loss of a reactant or the rate of formation of a product. The rate is measured by dividing one by the time the reaction took to take place.