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I am going to carry out an investigation to find out how concentration would affect the rate of reaction.

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Introduction

I am going to carry out an investigation to find out how concentration would affect the rate of reaction. The RATE of a reaction is the SPEED at which a reaction happens. If a reaction has a low rate that means the molecules combine at a slower speed than a reaction with a high rate. The rate of reaction depends on the type of molecules, which are combining. There is another big idea with rates of reaction, the COLLISION THEORY. The collision theory says that the more collisions, the more likely combinations of molecules will happen. So if there are a higher number of collisions, more combinations of molecules will occur, the reaction will go faster, and the rate of that reaction will be higher. We can measure the rate of reaction by timing how long it takes for Factors that affect the rate of reaction are: o Temperature o Surface Area o Concentration Temperature As you increase the temperature the molecules will move around quickly beacuse they have more energy. When they move around more quickly there more of a chance that the molecules will collide. This means that the molecules will be more likely to combine. When you lower the temperature the molecules are slower and there will be less collisions. As the temperature drops it lowers the rate of reaction Concentration of Acid If the solution is made more concentrated it means there are more particles of reactants knocking about between the water molecules, which makes the collisions between the important particles more likely. ...read more.

Middle

Volume of acid (ml) Time (secs) 1st 2nd 3rd Average 1 10 70 2 20 60 3 30 50 4 40 40 5 50 30 6 60 20 7 70 10 I will make sure that these readings are reliable by checking that the volume that I add of the water and acid is exact and that when the strip dissolves I stop the time exactly when it dissolves. The range that I have chosen is reliable because on the measuring cylinder the measurements go up in ten so i will be able to measure the volumes properly. Here are my results to my experiment: Readings Volume of water (ml) Volume of acid (ml) Time (secs) 1st 2nd 3rd Average 1 10 70 12 14 17 14 2 20 60 17 18 20 18 3 30 50 24 25 27 25 4 40 40 32 33 34 33 5 50 30 54 70 77 67 6 60 20 168 171 175 171 7 70 10 Took To Long I will not be taking any more readings because from the table I can see that my results are reliable and accurate because the results are showing what I predicted. I have processed my results on to a line graph because a line graph can show you much more clearly what you want to find out and what I have found out is that I can see pattern in my ...read more.

Conclusion

If I had to do this experiment again I would do it the same way and using the same apparatus but I would keep on changing the acid and water volumes and I would weigh the magnesium strips before I use them and I would check the temperature of the room to see if they are the same. If I were to extend this activity I would use temperature. Using temperature would provide me with further additional evidence for y conclusion because: Temperature As you increase the temperature the molecules will move around quickly beacuse they have more energy. When they move around more quickly there more of a chance that the molecules will collide. This means that the molecules will be more likely to combine. When you lower the temperature the molecules are slower and there will be less collisions. As the temperature drops it lowers the rate of reaction. If I did the temperature experiment I would find out that I would get similar results and conclusion. Other factors that might be useful to investigate are the surface area and catalysts. Catalysts A catalyst is a substance that speeds up the rate of reaction without being used itself up. They work by giving the reacting particles a surface to where they can stick to so that they can bum into each other. This then obviously increases the collision rate too. This document was downloaded from Coursework.Info - The UK's Coursework Database Click here to visit Coursework.Info/ ...read more.

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