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Rates Of Reaction

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Science Coursework- Rates of Reaction Aim: My aim of my coursework is to investigate factors that affect the rate of reaction. Before I chose what I am going to investigate I first brainstormed some ideas about what affect the rates of reaction/ speeding up reactions. Here are the ideas I came up with: * Temperature * Concentration * Surface area * Volume of reactants * Mass of reactants * Add a catalyst After looking at these things that would increase a reaction I decided that would investigate concentration. I made this decision because it was an investigation that I would be able carry out in the period of time I was allowed and I had the equipment and solutions available to me, to carry out the investigation. The only other one I could have possibly investigated would have been an Increase in temperature however I decided not to investigate this any further. I did not use either gas or a catalyst, as they would be un-performable investigation to make within a school laboratory. That is why I decided on the variable I did. Hypothesis: I predict that as I increase the concentration of hydrochloric acid the quicker the reaction between the hydrochloric acid and calcium carbonate will be. ...read more.


Then I will divide 1/ the average time for each experiment. * After completing a final results table with average times for each experiment and with the rate of reaction I will write my conclusion discovering if my hypothesis was right and then plot a line graph and evaluate my coursework. To make sure my investigation is fair I am going to use all the same equipment I am going to have the same person timing so we have fair stop and start points. We will use the same measuring cylinders also that we always get the same measurements. I have chosen measuring cylinders that hold the specific amount of solutions and water I need to make my investigation more reliable. Although I will be varying my concentration I will be keeping the temperature, particle size and quantity of solution A the same. I will be keeping the temperature the same as an increases temperature speeds up the reaction which would interfere with the results of my investigation and chosen variable. The stop watch I will use with measure seconds to 0.01 seconds this will not only make my investigation fair as I will be using the same equipment through out but it will also help to support my final results. ...read more.


The particle diagram below shows my thoughts here: If I were to predict where the graph would go next I would say that it is going to reach a maximum point at which it cannot go beyond, it is unable to accede where it reaches when it reaches the maximum point. I predict this because once a Solution A particle is completely surrounded by solution B particles it is unable to alter anymore. The diagram below explains this: Once it is surrounded it does not matter how much Solution B's concentration is increased it cannot affect the fact Solution A is surrounded. Although my prediction is supported by my results I cannot say that my prediction was right. All my results suggest that if you double the concentration then you double the rate of reaction and that is what I set out to do support my prediction. And although I have done this I can not say my prediction is right. I have not a carried out the right investigation to say whether or not my prediction is correct. I would need to use a more reliable experiment to say that my prediction was right. I have however gathered more supporting evidence to suggest that my prediction was correct. I have proved that if you double the concentration than you double the rate of reaction. Evaluation: ...read more.

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