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Investigation of the effect of Temperature on the rate of reaction

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Introduction

Sardaryan Armine 5mvl Investigation of the effect of Temperature on the rate of reaction The rate of reaction tells us how quickly a chemical reaction happens. If it is a high rate of reaction, it will take short time for reaction. However, if it is a low rate it will take a long time for reaction. Fast reactions, like dynamite exploding, start and finish within a fraction of a second. However, the slow reactions, like concrete setting, may take days or weeks sometimes years to finish. During a reaction, we can measure how much reactant it used up in a certain time. In addition, we might choose to measure how product is formed in certain time. The advantage of this experiment is that it allows to measure the rate of reaction at different temperatures, because the current produced by the cell is the rate of reaction - the faster the reaction goes, the more electrons are produced. It is important for people in industry to know how fast a reaction goes. They have to know exactly how much of their rate product they can make each hour or day. Effect of concentration As you increase the concentration of acid, there are particles that are more acid in the same volume. If the concentration of any reactant in a solution is increased, the rate of reaction is increased. Increasing the concentration increases the probability of a collision between reactant particles because there are more of them in the same volume. In conclusion, we can say that concentration increase when the rate of reaction is increase. ...read more.

Middle

I think we wont need to do duplicates, because we cant do the same temperature and it wont be as accurate as it can be. Approximately temperature 0C Actual temperature 0C Time/ s Rate/1/s 25 25.5 87 0.011 30 33 51 0.016 35 37 40 0.023 40 42 33 0.030 45 47 25 0.040 50 51 23 0.043 55 58 15 0.067 60 59 13 0.077 5 63 11 0.091 70 70 9 0.111 I think my results are good enough, because we were doing it really careful. We were doing the10 readings because it's a minimum to get the possible, right results. We used thermometer to check the temperature, also we used stopwatch to check if the reaction is fast or slow. To describe my experiment, at first I will set up my apparatus. Then I will wear safety goggles and lab coat. Then I will need two beakers and label one of then as acid and another as sodium thiosulphate. Also I will need a cross on a piece of paper and set up the Bunsen burner on a mat underneath a tripod and gauze. To measure acid, I will need ac measuring cylinder, conical flask, stopwatch, thermometer and pipette. This is a diagram of my apparatus, which I will use for my experiment After I set up my apparatus out, I will measure the amount of the sodium thiosulphate and hydrochloric acid. I will pour sodium thiosulphate into the beaker, which was labelled as sodium. And I will use another cylinder to measure the acid. Turn on the gas and light the bunson burner, but do not do it underneath the tripod for it is in an awkward place and you might burn your self. ...read more.

Conclusion

The amount of acid I have decided on is 10ml. And so the amount of marble must be in excess - 3g. I can measure the speed of the reaction by how much gas is given off. I can measure this in cm3 in a gas syringe. When the experiment takes place, I will take the reading every 10-second to get a good graph for the results. If the reaction goes very quickly, I will take the readings every five seconds. I learnt from the trial experiments that it is quite hard to start a stopwatch, pour acid and stick a bung into a boiling tube all at the same time, so I will get someone to assist me while doing so. If the experiment goes on for a ridiculous time, I will cut it off. I don't think it is necessary to have the experiment go over three minutes, so I will cut it off then. Also, if the amount of gas goes off the scale I will stop it there. It is important to keep the starting temperatures constant for all the reactions as this can affect the results by giving the particles more energy (and making it faster). Think that the best way of displaying these results is by drawing a line graph. In it, I have used the average of the two sets of results. The pattern I can see is that when the reaction first starts, the reaction is fastest, from then on, the reaction slows. We can see this because the gradient of the curve is steepest at the beginning. The cause of this curve is that at the start of the reaction, there are the most amounts of acid molecules that are colliding with the marble. ?? ?? ?? ?? 1 ...read more.

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