Реферат: Rate Of Reaction In Sodium Thiosulphate And

increased the time taken for the reaction to take place decreases. This means

the rate of reaction increasers as it takes less time for a reaction to take

place, so more take place per second. In the temperature experiment the time taken

for a reaction to take place decreased by roughly 10 to 15 seconds for every

10°C increase in temperature, with the one anomaly being the 30°C reading.

There is also a trend in the increase in rate of reaction as the temperature

increases. The difference is always more or less 0.02 s-1, with the same

exception.

Using the graphs, with lines of best fit, I can draw a conclusion from my

experiment. Firstly I can see that with the ?time? graphs (that plot

temperature and concentration against time taken for the reaction to take

place) the graphs have negative correlation in both cases, meaning that as the

temperature\concentration increased the time taken for the reaction to take

place decreases. The time graph for the temperature experiment has a much

steeper curve than the one for the concentration experiment, meaning that the

decrease in time taken for the reaction was far more rapid.

Naturally, the above means that the both the graphs plotting rate against

temperature and concentration have positive correlation ? as the temperature

and concentration are increased so does the rate of reaction. This is because

when the temperature is increased the particles will have more energy and thus

move faster. Therefore they will collide more often and with more energy.

Particles with more energy are more likely to overcome the activation energy

barrier to reaction and thus react successfully, and when solutions of reacting

particles are made more concentrated there are more particles per unit volume.

Collisions between reacting particles are therefore more likely to occur.

The graph for concentration shows that when the concentrations were relatively

low (10, 15, 20 g/dm3), the increase of rate x1000 was also fairly small

(increasing from 4.47 to 6.71 to 9.47). There was then a gradual increase in

the difference, and between 30 and 35 g/dm3 the rate more than doubled from