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Agar Jelly Lab Report

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4. EVALUATION AND CONCLUSION

CONCLUSION

The data did support my hypothesis as stating that the larger a cell is, the harder it is for diffusion to take place as the surface area to volume ratio decreases throughout evidence supported. There is a pattern in table 5 shows that, the surface area to volume ratio decreases when the agar jelly increases in size from 1cm to 3cm cube by a ratio of 6 to a ratio of 2, showing that average rate of diffusion which decreases as the size of the agar increases has a linkage to cells as cells increase in sizes. ‘If a cell grows beyond a certain size, materials will not be able to pass through the membrane fast enough to accommodate the inside of the cell. So when the cell reaches a size too large, it will …show more content…

There were also inaccuracy in the data, using table 4 as an example, the S.D. for trial 12 was 4.9 the smallest unit while the average S.D. unit was 7.2 which is 2.3 units different and proves that the data contains inaccuracy which cannot be completely trusted. The qualitative noted down in Table 1 could be trusted as there is proof that they are correct. Using No. 5 as an example ‘ The larger the cube is, the slower diffusion takes place.’ which is correct as the rate of diffusion is affected by the size of the agar cube. Using another example ‘When stirring, cubes will float so the upper surface have less contact with sulphuric acid’ which is true as sulphuric acid’s acid strength increases it makes it less dense ( according to the graph from the left ), and the sulphuric acid was 1M making the acid less dense allowing the agar to float, decreasing the surface area for the agar to touch the acid ( if not stirred ). http://www2.dupont.com/Clean_Technologies/es_MX/assets/downloads/AnalyticalOptionsforOnline.pdf EVALUATION The S.D. ( Standard deviation ) of the table is calculated through excel but the calculations toward it is: …show more content…

Firstly to make sure that the agar blocks are accurately enough, we could use a tri - square ( 90 degree ruler ) to measure the 90 degrees angles of a cube to make sure that the cubes are sliced or cut correctly. Secondly to make sure that the mixture could be stirred well, we could use a magnetic stirrer so that the string of the mixture is passive and those not fluctuate and increasing the accuracy for the experiment. Lastly, it is to also time the time that the agar is completely diffused by the sulphuric acid which could be used as a comparison between the time took to change the agar - phenolphthalein cubes to become completely clear which could increase the arguments for cell size increasing decreases the rate of diffusion. The amount of data was enough as there are more than 5 different datas for every variable which increase the reliability of the

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