"What effect does changing the temperature have on the rate of reaction?"

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“What effect does changing the temperature have on the rate of reaction?”

Aim:

I am going to produce a piece of coursework investigating the rates of reaction, and the effect different changes have on them. I have chosen to investigate the effects temperature has on a reaction. This is because it is the most practical thing to experiment. and I am already familiar with the chemicals hydrochloric acid and sodium thiosulphate.

Fair test:

In order for my findings to be as accurate as possible the experiment must be fair. I will use the same stop watch each time for judging when the “X” has disappeared. I will make sure that the measuring cylinders for the hydrochloric acid and the sodium thiosulphate will not be mixed up. The amount of hydrochloric acid will be fixed at 5cm3, the sodium thiosulphate at 10cm3 and the distilled water at 40cm3 each time. All these precautions will make my final results more reliable.

Safety:

A pair of goggles will be worn whilst handling the chemicals to avoid damage to the eyes. Asthmatics will not be allowed to directly inhale the fumes of the chemicals as this may cause a possible asthma attack.

Prediction:

I predict that as the temperature is increased the rate of reaction will increase. This means that the graph that I eventually draw will have a positive correlation, and will be curved because of the increased rate of reaction. When the temperature is increased the particles will have more energy and be faster. Therefore they will collide more often and with more energy. This means the rate of reaction will be quicker and more successful.

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Equipment needed: 

  1. 1 pair of goggles
  1. 1 stopwatch
  1. 2 measuring cylinders
  1. 2 conical flasks
  1. 1 beaker
  1. 1 pipette
  1. 1 “X”
  1. 1 water bath
  1. 1 thermometer

I have planned to change one thing in my sodium thiosulphate and hydrochloric acid experiment and that is the temperature. Some of the important things that are going to be kept the same are the measurements of chemicals and the "X" because the pressure used to draw the “X” may be effected. I will observe ...

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