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# rates of reaction

Extracts from this document...

Introduction

Rates of reaction coursework The rate of reaction is the speed in which the reaction occurs. For a reaction to take place, the particles that are reacting have to collide. If they collide, with enough energy and pressure to turn, then they will react and form a compound. There are 4 factors what effect the rate of reaction. Firstly temperature will effect the rate of reaction as there will be more energy in the particles making the particles faster resulting in more chance of collision. Secondly concentration and pressure will effect it as if there is more pressure there will be more particles within a given space therefore particles will collide more often resulting in the rate of reaction increasing. Thirdly the size of the particle will effect the rate of reaction as if the particle is smaller the greater the area that the reaction can take place in. ...read more.

Middle

1.5 molar =237g of sodium thiosulphate in 1000mls of water. 1 molar =158g of sodium thiosulphate in 1000mls of water. 0.5 molar =79g of sodium thiosulphate in 1000mls of water. 0.25 molar =39.5g of sodium thiosulphate in 1000mls of water. Method I will wash out all apparatus to avoid cross contamination. 1. Into a conical flask I will add 25cm� of 2 molar sodium thiosulphate. 2. The flask will be placed on top of a piece of paper with a pre drawn cross on it. 3. 25cm� of hydrochloric acid is added to the flask and the stop watch started as soon as the acid has been added. 4. When the precipitate of sodium has formed and at the point when I can't see the cross I will stop the stop watch and record the time in a pre prepared table. ...read more.

Conclusion

I think my results have shown a big enough range as I have done 4 results these were enough to draw a conclusion as it shows a negative correlation on the graph. I didn't have no problems with my method as I repeated the results 3 times and got the average however I should have used a thermometer as the temperatures could have been different effecting my results. However I did measure the thiosulphate and the acid as if I didn't there would be more particles meaning more chance of collision. And my results were very precise as I used a stopwatch which meant the time was accurate unlike if I counted the time myself. The readings for the reaction was fairly accurate however it could be improved by using a light sensor what meant we would know the exact time in which we couldn't see the cross. ...read more.

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This is a routine task of limited complexity. The appropriate level of scientific vocabulary is used. However with no results data or graphs included the quality of the report is limited. Specific strengths and improvements have been suggested throughout.

Marked by teacher Cornelia Bruce 17/04/2013

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