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To find out whether concentration affects the rate of reaction in an experiment.

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Aim: To find out whether concentration affects the rate of reaction in an experiment. Introduction: There are five main variants in controlling the rates of reaction. That is surface area, concentration, pressure, light and catalysts/inhibitors. With surface area the larger the surface the faster the rate of reaction, this is because there is more surface for the solution to act on. For pressure the higher the pressure the faster the rate of reaction, due to the amount of collisions. Light does not affect many reactions except photo chemical ones. Catalysts have the ability to speed up a reaction without having any physical change inflicted on it. On the other hand inhibitors slow down reactions (which does not apply to this coursework). Finally concentration is when higher the concentration the faster the reaction, as there are more particles to fuse with and react therefore accelerating Equipment: Ceramic/ Plastic Beehives 3 Glass Measuring Cylinders Water Molars 0.25, 0.5, 1, 2, 4 of Hydrochloric Acid (20cm�) 3 Conical Flasks 3 Rubber Bungs 3 Rubber Tubes Medium sized pieces of Limestone Weighing Machine Plastic container 3 Beakers Plan: We will fill a large plastic container with water, and then we place the three beehives into the water. ...read more.


As I have said in my introduction about concentration, the higher the concentration of a substance/solution in an experiment. This is because when oxygen is used up it causes more collisions between molecules that speed up the rate of reaction. What will we do to make it a fair test? First of all we will use the same amount of HCL acid each time we do an experiment. Also we will use the same weight, size, and type of rock. When we fill the measuring cylinder up with water we will ensure that no air pockets are trapped that could alter the results we get. Also each type of equipment we use will be hopefully of the same type. Method: We did this experiment over 3 lessons, which fortunately gave us ample time to do the reactions. To be honest the first lesson was really getting to terms with the method of the experiment and the ways we could make the experiment unfair. Then over the next two lessons we did the actual experiment. ...read more.


Evaluation: This experiment I find, went very well as opposed to the last experiment I did. It was a combination of 99% accuracy and 1% inaccuracy. Though saying that there were a couple of slight glitches that could have been ironed out. Firstly we kept using beehives of different materials (some ceramic and some thin, cheap plastic) the plastic would usually be unstable which would cause air pockets. Also when we put the rocks into the acid there was some hesitation so each experiment would have been started at totally different times. Another problem encountered is that toward the end of experiments (when it cam to higher molars) the rate of reaction goes so fast that we could not adequately record results down. I think That those mistakes could have been over come if we had either 1) more time to do the experiment or 2) there were more people manning each station of the experiment. In an ideal world I think I would do a similar experiment but in a more hi-tech lab with constant equipment allocated only to me and there was more of a time-span. ?? ?? ?? ?? Laxmi Menon Page 1 Science Coursework 4/26/2007 ...read more.

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