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Investigate what affects the speed at which the jelly will dissolve in water. This investigation will be using the theories we have covered on the rates of reaction and the collison theory.

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Introduction

The investigation I have to do is I have to investigate what affects the speed at which the jelly will dissolve in water. This investigation will be using the theories we have covered on the rates of reaction and the collison theory. I am going to try to get the jelly to dissolve quicker by increasing the surface area. I predit that when increasing the surface area of some jelly, I think each time I change the surface area then the time the jelly dissolves will be increased. I think this because each piece of the jelly I will be using will be small, so in that case there will be less to dissolve, as I think increasing the surface area in any investigation will speed up a reaction. So the smaller the pieces of jelly, the quicker my groups reaction will happen, as more collisions. As in the collision theory, it says that when increasing a surface area more collissions will happen. ...read more.

Middle

4. We will start the stopwatch at this stage while another member of the group is stirring the jelly. 5. When the jelly has then dissappered we will stop the stopwatch and record our results in a table. We will then repeat all of these steps for the next lot of jelly. Fair Test? Yes me and the group I am in will be doing all we can to make the experiment a fair test. The only thing we will be changing throughout this experiment is the surface area of the jelly, as the temperature of the water will always be at 60oc. We will always be adding 100ml of water to the beaker to be heated. All the jelly cubes will weigh 9 gram, so the starting mass of jelly will stay the same. It is important to make this a fair test because if we don't then our results will not be reliable. ...read more.

Conclusion

Our investigation was quite fair, but I think next time if we do the experiment again there is a few things I would change to make it a fairer test and these things would be: * Making sure all the jelly pieces are the correct size * Checking the temperature is spot on each time. Overall I am happy with my results as they prove that the predication I made was correct. You can refer to the collision theory when looking at my results, as the collision theory explains that when a surface area is increased more collisions happen which speeds up a reaction and this is exactly what happened in my experiment. The only thing that did surprise me is that on Attempt two using 2 half's took longer to dissolve than on the first attempt, this also crops up in many other places. I think this is because as I referred to before the pieces of jelly were not all the same size. I feel this could of altered the investigation as at time there would have been big and small pieces of jelly to dissolve. ...read more.

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