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# Investigate how temperature affects the amount of time it takes for a reaction to happen?

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Introduction

Rate of Reaction Investigate how temperature affects the amount of time it takes for a reaction to happen? Preliminary work and research The most important rule and theory in this project is the collision theory. (The following information I learnt from my teacher.) "In order for a chemical reaction to occur, reactant particles must collide with sufficient energy to cause molecular rearrangement" This collision is called a 'fruitful collision' Any factor that affects the number of fruitful collisions will affect the rate of reaction. Temperature, concentration, surface area and catalysts all affect the rate of reaction between two chemicals. The factor I am concentrating on The factor I will be concentrating on in this investigation is temperature. If the temperature of a chemical is increased the particles have more energy so they move around faster and with more force. This means there will be more collisions per second and the energy of the collisions will be greater. This means that there will be more fruitful collisions per second. So: The hotter the substance: the more fruitful collisions there are: the faster the reaction takes place. ...read more.

Middle

5. Measure how long it takes for the cross to become invisible as the chemicals turn cloudy. When it is no longer visible, stop the timer and note down the time. 6. Repeat the exercise but this time heat the Sodium thiosulphate in a beaker on a Bunsen burner to a desired temperature before adding the Acid. Safety: * Make sure no chemicals come in contact with the skin or eyes. * Wear goggles * Don't pick up hot Tripods or Bunsen burners. Important- use the same amount of each chemical each time and use the same cross because if you use a different cross , one might be more prominent than the other. I intend to get accurate results by: * Carefully measuring out the chemicals. * Making sure the chemicals are clearly named. * Rinse the conical flask out before re-using it. * Allow for the thermometer to adjust to the temperature of the Sodium thiosulphate so I am sure of the temperature. * Use the same cross. * Repeat the experiment to reduce risk of anomalies and to get an average. ...read more.

Conclusion

The closest thing to an anomaly I discovered was a 7 second difference between two readings. This probably came about because it is hard to get the temperature right and to start and stop the timer at the right time. Apart from the one slight anomaly I didn't find any more in my results. Improvements and further work. If I was to do the investigation again I would find a more suitable way of measuring when the reaction was compete because it was hard to tell if you could still see the cross. It would be a good idea to get water from thermostatic vat so I know the water was exactly 10 Oc warmer each time. If I had more time I would have used one more different temperature of Sodium thiosulphate to see if there was any more of a decrease because the differences each time did start to slow down. Overall I think I carried the investigation out well. This method gives a good insight into what happens in general but I would have to use more scientific apparatus not available to me if I wanted to study it in detail. ?? ?? ?? ?? Jemma Yale- 2728- Summerhill-20546 - Rate of reaction ...read more.

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