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RATE OF REACTION
AIDANA UTEGENOVA
MIRAS INTERNATION SCHOOL
INTRODUCTION
Reaction rate is how fast or slow the reaction can go. There are 5 factors affecting reaction rates.
In this investigation our aim is to identify one such factor and find out what effect it has on the reaction rate. I chose the fourth factor which is temperature because I though it is going to be faster, easier and interesting. So my aim is to investigate the effect of temperature for the rate of reaction by measuring the time of the reaction (when the cross of the paper disappears) while changing the temperature.
My hypothesis is if the temperature is higher the faster the reaction will go it connects with the collision theory because it is when reaction substances must collide and reacting substances must collide with sufficient energy to form activated complex and the last point is that reacting substances must collide with the correct orientation. Based on it low temperature the particles of reactants will move slower however when the temperature is increase the particles will observed the heat energy so then the kinetic energy increases and the particles move faster and faster collide → faster reaction.
PROCEDURE
The variables
|
Type of Bunsen burner |
controlled |
|
Type of paper |
controlled |
|
Type of beaker |
controlled |
|
Volume of sodium thiosulphate solution |
Controlled – 10ml |
|
Volume of hydrochloric acid |
Controlled – 10ml |
|
Time |
dependent |
|
Temperature of solution (0C) |
independant |
Method
APPARATUS
RESULTS
|
TEMPERATURE (0C) |
TIME (sec) |
AVERAGE(sec) |
|
20 |
|
8.3 |
|
30 |
|
5 |
|
40 |
|
3 |
|
50 |
|
3 |
|
60 |
|
2 |
AVERAGE RATE – 1/TIME TO PRODRUCE (sec)
GRAPH
CONCLUTION
I can conclude that generally the rate of the reaction increases when the temperature increases. My hypothesis is correct because as I said before it low temperature the particles of reactants will move slower however when the temperature is increase the particles will observed the heat energy so then the kinetic energy increases and the particles move faster and faster collide → faster reaction.
EVALUATION
When I did an experiment I met some strange results like when I did the experiment with 200C. First result is 5 and then 10 so I don’t understand why I had this result but then I did the experiment third time and also had 10sec. I guess that is it because of some human factors like when slowly stop stopwatch (not clearly on the real time), because of our method, the temperature is not exactly 20 but 23 or 21 and it was pretty hard to concentrate on the experiment because of smell of reactions, maybe it affected my results, but starts from 300C the results become more real and proper. One more strange point is that all results are integer. Maybe there were not integers but we tried to make everything fast and mistake with numbers but I think it is not very big mistake because the real results might be closely to our results and it didn`t affect whole experiment. We had some problems with our method because we weren’t detailed with it and that is why we have strange results but we didn`t changed it during our experiment. In my opinion next time I will be more detailed and attentively during plan the method. Also it is very important be attentive during an experiment because it affects your results and maybe whole investigation. This experiment really helped me to know more about reaction rate and if I see this kind of reaction I will exactly know how it works and what factors affect it.