When we could not see the cross anymore, we have stopped the clock and note the time. We redo the same experiment with different temperature. To change temperature of the experiment we use a micro burner to heat the water and measure its temperature with a thermometer and then we put the sodium thiosulphate solution and the hydrochloric acid and we time the reaction. We do this processes 4 times.
IV) Table of results:
The rate of reaction => Temperature (°C) / time taken(s)
The reaction and the temperature:
V) Graph:
There is three types of variable in this experiment the independent variable which is the temperature, the dependent variable which is the rate of reaction and the constant variables which are all the substances of this experiment because their remain constant.
The rise of the temperature increases the rate of reaction. In other words when the temperature rise the speed of the reaction increase because when the temperature is high there is more energy. In the table of result we can observe that the temperature is lower at the end of the reaction. We can deduct it’s because the reaction take energy from high temperature.
The temperature change necessary to double the rate of reaction is about 10°C. But it is approximately true; it may be that the rate doubles every 9°C or 11°C. The number of degrees needed to double the rate change gradually as the temperature increases.
VI) Conclusion:
We have proved that the rise of temperature has an effect the rate of reaction. As you increase the temperature the rate of reaction increases. The rate of reaction doubles for every 10°C rise in temperature. But it is approximately true, the number of degrees needed to double the rate change gradually as the temperature increases. Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions which result in a reaction.
VII) Bibliography:
