There are a few outliers in my results. I used this to gauge when to stop the reaction — when the black x was obscured by the white sulphur precipitate, the timer was stopped. There are 2 outliers Improvements and further investigations: How to cite this page Choose cite format: Aim My aim is to investigate how changing the concentration of reactants can change the rate of reaction between hydrochloric acid and sodium thiosulphate. I also made sure that the measuring cylinder was on a level surface so that I could clearly see how much liquid I was putting in to it. This shows that as you increase the independent variable the concentration , the other variable the time taken for the experiment , went down.
The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a cover letter for customer service advisor position reaction. It is often used as a chemical intermediate and in petroleum production, food processing, pickling, and metal cleaning. If I do a further investigation, I will try to minimise the number of mistakes that I make. The state symbol for sulphur dioxide is aq not g because it is dissolved in water as its original state would be too toxic and corrosive for me to use safely. My data was precise because most of the points on my graphs are close to the line and are all close by each other. I have highlighted the 2M results on my tables because it seems as though there is a problem with that set.
This is because there will be more acid molecules in the same amount of solution, therefore thiosulhate effective collisions with the sodium thiosulphate, and the rate will be higher.
For example, when my concentration was 1M the average reaction time was seconds, and then when the concentration was 5M the average reaction time was seconds. This shows that my data is quite accurate. Sorry, but copying text is forbidden on this website!
I will discuss these further in my evaluation. I did have some outliers in my results; however I think that the experiment went fairly well overall.
I stood up to allow more space for others to walk by between the rooms. The reaction gcse sodium reaction and HCL Length: It can also be found in the stomach. Science Experiments Coursework Rates Essays].
This causes a quicker reaction.
Rate of Reaction and Specific Rate Constant. Click to learn more https: Activation energy Activation energy is the energy required to break the bonds of the reactants, so that new bonds can form to make the products.
(DOC) GCSE CHEMISTRY RATES OF REACTION COURSEWORK | Anjelina Qureshi –
These chemicals are perfect for my investigation because they are both clear and colourless. I also made sure that any clothing or long jewellery was clear and out of our way as clothing can also get caught. This is very important because loose hair can not only get dipped into chemicals but can also obscure vision.
I have calculated the gradient of my line to support my hypothesis and found that: Research Papers words 4. This is because when there are more molecules in the solution, there are more molecules to collide so this will speed up the reaction, and therefore it is more likely they will collide with each other.
These reactions only happen if the reacting molecules collide properly. Dependent variables are not controlled by the experimenter. For example, rusting is a slow reaction; it has a low rate of reaction. This could have happened because of calculation errors, human errors, recording errors or a fault with the equipment that we used. My conclusion is valid because it includes evidence that my data is accurate and I have summed up my experiment in it.
I will investigate how the rate of this reaction is affected when the experiment is carried out at different temperatures.
My data was precise because most of the points on my graphs are close to the line and are all close by each other. Evaluation My standard deviation sheet rage attached at the back of this document marked with an asterisk.
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This shows that there is no real difference between the results. I used this to gauge when to stop the reaction — when the black x was obscured by the white sulphur precipitate, thioaulphate timer was stopped. This makes sure that my experiment runs smoothly. I also made sure that thiosuplhate measuring cylinder was on a level surface so that I could clearly see how much liquid I was putting in to it. In my scatter graph with line of best fit, most of the points are close to the line.