Do think the results are reliable bearing in mind any anomalies. The independent variables will be the initial volume and concentration of sodium thiosulphate, and the initial volume and concentration of hydrochloric acid. 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.
Decomposing hydrogen peroxide with a solid catalyst or soluble transition metal compound. Overall I think that my investigation was successful in obtaining reliable results. Safety I will make sure I handle the sodium thiosulphate solution and hydrochloric acid with care.
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.
This shows that there is no real difference between the results. Obtaining evidence - observations, measurements, in other words the results. The simplest solution here, is to make sure all the chemicals have been standing in the laboratory prior to the lesson.
I think this because there is outliers in the 2M set of data and the error bars overlap between 1M and 2M on my error bar graph. Background Research Chemical reactions are to do with changing the materials that form the base of your experiment. 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.
The light reading falls as the sulphur precipitate forms.
First, you can start by describing the reaction situation you are intending to investigate e. What I predicted in my preliminary test was, as the sodium-thiosulphate concentration increased, the time taken for the solution to turn cloudy took longer.
I got the results needed to answer my prediction and the coursework aim. I also feel very confidant that my investigation went well. Once I decided the concentration I then carried out my experiment. So the following procedure can be used to carry out the experiment. As soon as the chemicals were in, I started the timer.
More marks are lost by not writing things down, than by not doing experiments. A few health and safety ideas on risk assessment AIM for a high investigation-project mark - you have nothing to lose for your assessment. Collecting Data In my experiment most of the variables I had were: In addition to this, more particles have activation energy.
My conclusion is justifiable because I have backed it up with points from my data and I have proved all the points that I made. This web page is meant to teach you how to tackle an coursework e.
Nevertheless I measured the time taken to the nearest second which builds precision in my experiment. This problem would have been avoided if I used more accurate equipment.
Maybe using a better timer to record my results would have granted me more accurate 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.
Is there any other factor for the reaction you are studying. This makes sure that my experiment runs smoothly. - Reaction Rates The 4 factors that control the rate of a reaction are: * Concentration * Temperature * Surface area (substances size) * Catalyst CONCENTRATION.
In this experiment I am going to find out how the rate of reaction between sodium thiosulphate and hydrochloric acid is. The effect of concentration is demonstrated using an iodine clock reaction. The effect of temperature is demonstrated using a glowstick.
choose your GCSE subjects and see content that's. 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.
Rates of Reaction Coursework. Introduction. Reaction rates are explained by the collision theory. The collision theory is explained by the rate of reaction. [tags: GCSE Chemistry Coursework Investigation] Research Papers words Evaluation.
My evidence is extremely reliable, I. Reaction rates are explained by the collision theory. The collision theory is explained by the rate of reaction. [tags: GCSE Chemistry Coursework Investigation] Research Papers words GCSE Chemistry Coursework Investigation] Free Essays words ( pages) Rates Of Reaction Essay Evaluation I think my results were very.
GCSE CHEMISTRY RATES OF REACTION COURSEWORK. Anjelina Qureshi Mrs Gravell Rates of Reaction Coursework Chemistry Year 11 Rates of reaction Introduction A chemical reaction occurs when things change from reactants into products.
These reactions only happen if the reacting molecules collide properly. Evaluation My standard deviation sheet.Gcse chemistry coursework rates of reaction evaluation