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Chemistry Coursework - Rate of Reaction

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Chemistry Coursework - Rate of Reaction In this investigation I will be studying the aspects that effect the rate of a chemical reaction. I will be using a chemical compound called Sodium Thiosulphate with Hydrochloric Acid, a Timer, two different sized beakers measuring 500mls and 50mls, a measuring cylinder which measured up to 25mls and a piece of paper with a cross located in the centre of it. The all equipment is shown below in the working order for the experiment. Elements Elements are a collection of atoms of one specific type and can be located on the Periodic Table of Elements. In this investigation the chemical elements I will be using are Sodium and Sulphur, also Hydrogen and chlorine that these elements are formed into compounds before the experiment via a simple chemical reactions and then dissolved into water. This results in Sodium Thiosulphate and Hydrochloric Acid. Compounds Compound are two or more elements combined such as Sodium Thiosulphate is a compound of the two elements Sodium and Sulphur. ...read more.


If the concentration of one of the compounds is increased the reaction will be quicker if the temperature is the same because there are more atoms of one type to collide successfully with the other compound, resulting in the reaction being quicker when compared to a reaction with lower concentrations of the compounds dissolved into water. � Catalysts Catalysts can speed up a chemical reaction because they reduce the amount of energy needed to have a successful collision and they are never used up and remain exactly the same at the end of the experiment as they were at the start. Prediction I predict that as the concentration of the Sodium Thiosulphate increases the reaction between the Sodium Thiosulphate and the Hydrochloric Acid will be quicker when compared to a lower concentration if the Hydrochloric Acid has the same concentration in both experiments and the temperature stays the same throughout. This is because the atoms of the Sodium Thiosulphate and Hydrochloric acid need a certain amount of energy to collide with each other successfully to create a new chemicals. ...read more.


Results Run Vol Na2S203 cm3 Vol HCL cm3 Vol H2O cm3 Time Taken (s) Rate (1/time) 1 50 5 0 25 0.040 2 40 5 10 32 0.031 3 30 5 20 42 0.024 4 20 5 30 64 0.016 5 10 5 40 172 0.006 Conclusion From my results I have gathered I have concluded that as the concentration of Sodium Thiosulphate decreases the experiment takes longer to finish. This is because there are less Sodium Thiosulphate atoms to collide successfully with the Hydrochloric Acid resulting in the experiment taking longer which the results do show. The prediction I created earlier on, before the experiments were carried out is proved correct by my results that I have collected. Evaluation The investigation has gone very smoothly with the results being accurate to certain degree from reacting the Sodium Thiosulphate with the Hydrochloric Acid, which has left myself being able to appear with a firm conclusion from the results I have gathered. I don't think I could of improved the experiment because their wasn't anything that went wrong but I could of done another variable to appear with an even stronger conclusion, if my predictions for the additional variables were correct with my results. ...read more.

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