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# How does the temperature Affect the rate of reaction For the chemicals hydrochloric acid And sodium thiosulphate.

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Introduction

Nick Martin Set 1 Science 12/01/02 How does the temperature Affect the rate of reaction For the chemicals hydrochloric acid And sodium thiosulphate. Aim The experiment will involve me adding a fixed amount of hydrochloric acid and sodium thiosulphate together and by seeing when it goes cloudy investigate how long it takes for them both to react when they are at different temperatures. Research A reaction rate is measured in two ways: either the quantity of the product made or the time it takes for the substances to react. Rate of reaction differs from chemical to chemical; for example the chemical reaction I am studying will last an average of thirty-two seconds at room temperature. However many other reactions like rusting will happen over a longer period of time. There are seven main factors affecting the rate of a reaction: * Concentration, * Pressure, * A catalyst, * Surface area, * Particle size, * Light, * Finally, temperature is the one I will investigate. ...read more.

Middle

I then proceeded to put all of my results into a table, which I used to draw up my graphs. Fair testing was inevitable for accurate results. Many things were taken into account when doing the experiment like for example: * All equipment was kept constant, e.g. volume of conical flask, * Room temperature, * Concentration of acid, * Amount of chemicals, * Contamination of chemicals. To combat each of these I made sure that I wrote down the constant values I used in the first experiment and repeated these values in all the following ones. Checked to see if the room temperature varied about or below 2�C from the temperature at the start of the first experiment. Finally I made sure that all beakers, flasks or measuring devices were cleaned and dried before being re-used to minimize contamination between chemicals. Results I have put all of my results into tables and then into graphs (see attached graphs). ...read more.

Conclusion

Evaluation I think the experiment was successful. I might have been able to improve my results by using more finely tuned equipment or repeating the experiment more times. I encountered 1 anomaly in my results, and this may be explained by the only drawback in the result accuracy: human error when operating the stopwatch. I feel I could do more to expand on the original question set by perhaps doing other experiments linking with this one like looking at for example: * Concentration, * Pressure, * A catalyst. I may have been able to study concentration; the more concentrated a product is the more particles there are to react in the same volume. Therefore, the products will collide more and react faster. Pressure will cause the particles to be forced closer together and therefore react faster. Finally, a catalyst will increase the rate of reaction by making the products react quicker while not reacting or breaking down itself. This can be very useful as it can be used over and over again. ...read more.

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