Experiment to observe how rate of reaction depends on the surface area.
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Experiment to observe how rate of reaction depends on the surface: I) Aim: Prove that the rate of reaction depends on the surface. II) Hypothesis: Smaller the particle size is, faster the reaction will be completed; because when things are smaller, they are completed quicker. III) Materials: > 4 beakers > 1 timer > 1 frizzy tablet > 1 knife > 1 thermometers > 600 ml of water > lab coat and safety goggles IV) Method: * We cut the frizzy tablet in quarters. * We put 150cm3 of water in a beaker. * We put the quarter of frizzy tablet in it. * We time the reaction and we measure the temperature. * Then we put another 150cm3 of water in a beaker.
The temperature remains the same before, during and after the reaction about 20°C. A quarter of frizzy tablet in 4 pieces 30 seconds When we put the quarter of tablet in the baker the reaction makes the same fizz and some bubbles during 30s. The water is coloured with the same a fluorescent yellow colour. The temperature remains the same as before. A quarter of frizzy tablet in 22 seconds The quarter of tablet in the baker makes the same reaction during 40s. The water is the same colour. The temperature remains the same A quarter of frizzy tablet in 18 seconds The reaction last 18s and all remains the same. 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.
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.
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