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Investigation to find out the rate of reaction using catalyst.

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Introduction

Investigation to find out the rate of reaction using catalyst I am doing an investigation on rates of reaction involving catalysts. Enzymes are proteins that act as catalysts. They are made in the cells. A catalyst is a chemical substance, which speeds up a reaction but does not get used up during the reaction. One enzyme can be used many times over. Enzymes and biological catalysts are affected by the change in temperature and pH. If the temperature is too low the catalysts work too slow, but if the temperature is too high the catalysts will denature and stop working. Different enzymes work in different pH levels. If the pH is not at the right pH level for that enzyme, the enzyme will not work at its best potential. For example, the protein-digesting enzyme in your stomach works well at an acidity of pH 2. At this pH, the enzyme amylase, from the saliva, cannot work at all. The pH or temperature at which an enzyme works its best is called its optimum pH or temperature. Enzymes are needed to maintain life. Without enzymes the proteins, carbohydrates etc would not be broken down. Therefore no proteins, carbohydrates etc would enter our bloodstream. Which basically means we wouldn't be able to survive. There are many different types of enzymes. Each different type of enzyme has a different function or job. So if one type of enzyme broke down starch to maltose, this type of enzyme would not be able to break down proteins to amino acids. ...read more.

Middle

The results that are obtained will be very similar to the results I got in my preliminary test. I think the more concentrated the hydrogen peroxide is the more ox.nd there for w for sure that my prediction is correct re accurate average etc. ariable d ygen will be obtained because the higher the concentration is the faster the reaction will be, and because I am only seeing how much oxygen I can obtain in just 60 seconds, the higher concentration will make more oxygen in so little time. In my investigation I am going to observe how much oxygen is made from the celery and hydrogen peroxide reacting with each other. To make it a fair test I am going to use clean equipment on every experiment and I am going to use 20ml of hydrogen peroxide and 2 grams of celery in every experiment. The only thing I am going to change is the concentration of the hydrogen peroxide. For every different concentration, I will repeat that experiment 3 times. I will repeat it 3 times so that when I get an average it will be more accurate. I will take my readings from the experiments every 10 seconds. These are the results I obtained from my final experiment: Vol of 20ml of Amount of Time ML of oxygen obtained (3sf) Hydrogen peroxide Celery (g) (Seconds) 1st Attempt 2nd Attempt 3rd Attempt Average 20 2g 10 6 6 5.5 5.83 20 2g 20 9 8.5 8 8.5 20 2g 30 11 11 10 10.7 20 ...read more.

Conclusion

I thought that the experiments that I did was very successful. The experiments that I did fit with the prediction that I made, which was that the results I got would be similar to my preliminary test results. If I had to repeat the experiment, the changes which I would make would be: > I would increase the time that I got. This would allow me to concentrate more, which will help me make the results that were obtained more reliable and accurate. > I would use another more effective way to grind up the celery. This would make the result slightly fairer because then all of the celery used will be grinded to the same amount. > I would write down the readings to the nearest 0.1 ml. This would give me a more accurate average. > I would repeat the experiment more times to also get a more accurate average. The only difficulties I got during the experiments was that as soon as I added the hydrogen peroxide to the celery it took me about 1 second to place the bung on top of the conical flask and when reading the results off of the 100ml gas cylinder it was quite hard to get a very accurate reading. Finally to conclude this investigation I will state the fact I have learnt from doing this investigation: > The higher the concentration of the hydrogen peroxide which is added to the celery is the higher the amount of oxygen is obtained in a small amount of time i.e. 1 minute. Assad Taj ...read more.

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