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Chemistry Rates Of Reaction Marble chips and Hydrochloric acid

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Introduction

Year 11 Chemistry Rates of Reaction Coursework Planning How does changing the concentration of a substance effect the rate of reaction? Planning: This science coursework is an experiment, it will explore the rates of reactions, factors affecting the results and highlighting and explaining possible conclusions for any anomolies. It involves measuring and recording results in experiments that we have done in lessons, and then analysing the results in this coursework. The experiment is fairly simple but I will state the method and equipment we used to complete the exercise below. To ensure the test is fair, we must ensure the variables are kept the same throughout all the experiments. To ensure the test is as impartial as practicallity allows, I will ensure the temperature, acid concentration, surface area and timeing are all constant. This will ensure my results are as accurate as I can achieve. The experiment involves using hydrochloric acid (acidic) and marble chip (alkali). We are going to put both reactants into a chonical flask and collect the gas that will be given off. This will allow us to see which reaction is faster with different strenghts of hydrochloric acid, and also lets us compare results and draw realistic conclusions whilst we are doing each one. ...read more.

Middle

A recent study shown that most accidents in the lab occur whilst packing up. Also at this time people remove their goggles to pack up. This is especially dangerous as substances can get tipped into a sink and shoot back up into the face. To minimise the chance of injury I will ensure I wear googles from the begginning of the session until all the equiptment has been put away. Preliminary Work: Before I completed all my results, I couldn't get accsess to a gas syringe. I had to use a measuring cylinder and a plastic container to measure results. I found this was harder to measure and record, so I decided I would only use a gas syringe. Obtaining Evidence: To record my results as accurately as possible I designed the below table. I think it is handy as you can clearly record results and easily interpret the data on a graph. Experiment one: Experiment two: Time (secs) 0.1M 0.5M 1M 1.5M 2M 10 0 0 0 0 0 20 0 4 0 7 9 30 0 9 3 14 13 40 0 10 6 18 22 50 0 11 10 24 26 60 0 13 14 39 31 70 0 17 20 40 38 80 0 18 22 41 44 90 0 22 27 46 49 100 0 23 32 52 53 110 0 24 38 59 61 120 1 24 44 67 77 Time (secs) ...read more.

Conclusion

This however wasn't the case, as our graphs do not show anything which looks out of place or wrong. I was expecting some anomalies which could occur from human error of recording results, dirty equipment, the wrong strength acid, there is a wide range of possibilities that could have gone wrong. Improvements: I think the method we followed was in depth and correct. We followed the method that was given to us, so maybe that's why we got no anomalies. I think if we had more time to prepare I would make sure all the marble chip was of the exact weight, and the same size. We had to roughly measure their weight on innacurate scales, it was difficult as it was only sensitive to one gram. Further work: Once again, if I had more time to complete the exercise I would collect more results. This would provide more evidence and either strenghten my predictions or go against them. As my predictions were all met with five results, I don't think doing it again would prove them wrong. But if I make more sensible predictions I could do it again and see whether they are correct, or if incorrect, why? Also to complete it more accurately I could use a wider variety of acids. This way I could complete the exercise with more acids, giving me more varied results, better conclusions and accurate results. Name: George Edwards ...read more.

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