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Tripod Method Firstly I will draw a small dark cross on a piece of paper and place it on a bench mat. I will then put 40cm3 of sodium thiosulphate into a conical flask and place it on a tripod and gauze.
I will heat the solution for a few minutes until the desired heat is reached, i. Next I will place the conical flask on top of the cross, pour 5cm3 of hydrochloric into the hot sodium thiosulphate solution and time how long it takes for the cross to disappear.
On each experiment I will take three readings and work out an average from the data I have obtained. Below are diagrams to illustrate and explain my method Fair Test To ensure that this experiment Science coursework rate of fair I will control the variables, i.
I will keep everything constant apart from the variable I am changing-temperature. Therefore, I will make sure that I only change the temperature of the reaction mixture and keep the volume and concentration of the sodium thiosulphate, the volume and concentration of hydrochloric acid and the pressure of all the mixtures the same.
Furthermore I will measure out the volumes of both the sodium thiosulphate and hydrochloric acid to the greatest degree of accuracy I can manage. I will also try to make my timing and the heating of the sodium thiosulphate solution as accurate as possible.
Variables There are different variables which can be changed. I am, however due to my line of enquiry, going to change the temperature of the solution.
The independent variables will be the initial volume and concentration of sodium thiosulphate, and the initial volume and concentration of hydrochloric acid.
Below is a table to show the effect of changing different variables. Safety I will make sure I handle the sodium thiosulphate solution and hydrochloric acid with care.
I will also be careful when heating up the solutions and will at all times wear safety goggles and also remain standing throughout the experiment. Furthermore I will be careful not to spill anything and will take extra care when doing the experiment. Results Below is a table showing my results from the main investigation I can see from observing the table that the first part of my prediction was correct.
As the temperature increases the rate of reaction increases too, due to more collisions and more successful collisions, caused by the increase in temperature. I am going to draw a graph analyse by results properly.
It also has a line of best fit to show the consistency and accuracy of the results. There are no anomalous results which shows that the experiment was very accurate. Furthermore, the graph is a perfect curve It is obvious that there is a general trend in the results.
As the temperature increases, the time taken for the sodium thiosulphate solution to become cloudy decreases. This is because as the temperature increases, the reactant particles move more quickly. In addition to this, more particles have activation energy. This means more of the particles collide and more of the collisions result in a reaction, so the rate of reaction increases.
My results do support the first part of my prediction. Evaluation All of my results were accurate and fitted the pattern of results. I did not have any problem whilst carrying out my investigation apart and do not believe I could have done it any better without specialist equipment with plenty of time.
The quality of my evidence is good. There were no points on my scatter graph that were not on or close to the line of best fit. The range of my results were also suitable to make good observations and conclusions By comparing the repeated times on each of the experiments I can see that they were similar and each one was within two seconds of each repeat.
From this evidence I believe my results were very reliable. This might have occurred for several different reasons, such as the fact that the temperature control might not have been exactly the same or that my judgement of when the cross may have disappeared might not have been exactly the same for each one.
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. I could also change the initial volume of either the hydrochloric acid or sodium thiosulphate solution and see if I get a similar pattern of results.
If the results were consistent and accurate I could use them to back up my original theory.Ideas for coursework assignments or projects involving the rates or speed of chemical reactions on the Factors Affecting the Rates of Chemicals which also has brief descriptions of experimental methods and equations, particle pictures and fully explains all the factors affecting the rate of a chemical reaction.
10 | P a g e Anjelina Qureshi Mrs Gravell Rates of Reaction Coursework Chemistry Year 11 All of my research into rates of reaction has indicated that my prediction is correct.
I have used reliable resources to research this information and it all confirms my conclusion. on the rate of production of either hydrogen or oxygen gas during the electrolysis of acidified water.
Physics Investigate and compare the quantitative effects of changing (a) hair colour, (b) the usage of shampoo or similar commercial hair treatments on the tensile strength of hair taken from the human head. 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.
For the hydrochloric acid - sodium thiosulphate reaction you can plot either (i) reaction time, or (ii) 1/time versus a concentration or temperature (1/time = . on the rate of production of either hydrogen or oxygen gas during the electrolysis of acidified water.
Physics. Investigate and compare the quantitative effects of changing (a) hair colour, (b) the usage of shampoo or similar commercial hair treatments. on the tensile strength of hair taken from the human head.