Experiment to observe how rate of reaction depends on the surface area.

V) The table of results:

VI) The improvement:

To improve the result of the experiment we could have weighted each quarter of tablet that the different time were due to the size of the particles.     

        VII) The variable:

We start with the size of the particles of the tablet for first data so the size of the particles is the independent variable because it is independent from the result of experiment. The time of the reaction is the dependant variable because it is what we have measured. The temperature is the constant because during all the experiment it remains constant.

VIII) The graph:

The graph shows that less the size of the particles are big, less the reaction takes time. This confirms the hypothesis: “Smaller the particle size is, faster the reaction will be completed; because when things are smaller, they are completed quicker”.

IX) Conclusion and evaluation:

When quarter of the tablet use for experiment is cut in piece, it increases the surface of tablet in the water. As show on the graph: less the size of the particles are big, less the reaction takes time. When there is more surface, the time of the reaction decrease.    

By doing this experiment, we prove our aim:  rate of reaction depends on the surface and also the hypothesis: “Smaller the particle size is, faster the reaction will be completed; because when things are smaller, they are completed quicker”.

X) Research: How frizzy tablet produce their fizz:

The frizzy tablets are composed of solid dry powders of NaHCO3 and acetyl-salicylic acid press together. When they are pressed together to make a tablet, being solids, the molecules are not mobile enough to react. But by adding water to dissolve allows them to mingle and react. The disintegration of the reaction and the stirring from the gas bubbles help the "aspirin" dissolve in the water.

XI) Bibliography:

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