My results do support the first part of my prediction. Your write-up must be your work produced from your study and your experiments. Ensure that there are no naked flames. The sodium thiosulphate-hydrochloric acid reaction, you can investigate the effects of temperature and concentration.
Syringes should not be allowed to become wet, or the plungers will stick inside the barrels. This resource image was supplied by science photo library https: 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.
To further investigate the decomposition of sodium thiosulphate I could change the concentration of hydrochloric acid and sodium thiosulphate or use a catalyst in the reaction. 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.
Half fill the trough or bowl with water. In order to provide additional evidence and extend my investigation to find out more and back up my conclusion I could perhaps repeat the experiment using specialist equipment.
Decomposing hydrogen peroxide with a solid catalyst or soluble transition metal compound. I decided to use acid concentrations ranging from 0.
I am confident that these concentrations will give me sufficient results for my final graphs, so I feel there is no need for further preliminary testing. Prediction I predict that, as the concentration of acid in the test tube increases, so too will the rate of reaction.
However the acid is in excess, so it is mainly the loss of magnesium surface area becomes smaller that causes the change in the rate.
Corks are too porous and will leak. If a graph of volume y-axis against time x-axis is drawn, the slope of the graph is steepest at the beginning. If you are varying temperature, you need to heat up the reactant solutions separately and take their temperatures, mix, start stopwatch.
There were no points on my scatter graph that were not on or close to the line of best fit. Each experiment run will need 50 cm3. Pour the acid into the cm3 conical flask. If a gas is formed, there are at least two ways of collecting a gas e. Is there any other factor for the reaction you are studying?
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.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 ultimedescente.coms: GCSE Chemistry - Sodium Thiosulphate Coursework We must produce a piece of coursework investigating the rates of reaction, and the effect different changes have on them. The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction.
Chemistry Coursework - Rates of Reaction Investigation Introduction In this investigation I am going to be investigating the reaction between marble chips and hydrochloric acid, and to see what differences in the rate of this reaction arise when different concentrations of acid are used.
Students follow the rate of reaction between magnesium and the acid, by measuring the amount of gas produced at 10 second intervals.
3 cm of magnesium ribbon typically has a mass of g and yields 40 cm 3 of hydrogen when reacted with excess acid. 50 cm 3 of 1M hydrochloric acid is a. 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.
Investigating Rates of Chemical Reactions Essay - Investigating Rates of Chemical Reactions Planning. Introduction ===== I am going to investigate how increasing the concentration of a .Download