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GCSE Assessment - The Effect of Substrate Concentration on the Rate of Yeast Fermentation The aim of this investigation is to discover how the concentration of sugar affects the rate of fermentation by yeast cells. Fermentation is an anaerobic process and can be represented by the following equation. (enzymes in yeast) glucose › ethanol + carbon dioxide + a little energy C6H12O6 › C2H5OH + CO2 + a little energy Results These are the results gained for my experiment: Sugar Concentration 0% 2.5% 5% 7.5% 10% Initial Gas (mm) 8 8 9 9 11 Increase 3 mins 8 9 10 9 13 Increase 6 mins 8 9 10 10 16 Increase 9 mins 8 9 11 11 21 Increase 12 mins 8 9 11 11 27 Increase 15 mins 8 9 11 12 32 Increase 18 mins 8 9 11 12 41 Increase 21 mins 8 9 11 12 55 Rate mm of gas per min 0 0.1 0.2 0.2 2.1 These are the results gained from the whole class: NAME 5Z2 - PHR 0% 2.50% 5% 7.50% 10% Clark 0.24 0.38 0.52 1 3.42 Cooper 0.14 0.2 0.24 0.29 2.14 Dagnell 0.19 0.38 0.33 0.48 2.62 Davies 0.38 0.52 0.62 0.71 1.8 Evans 0 0.24 0.38 0.62 1.48 Gleave 0.14 0.14 0.25 0.81 2.45 Grimes 0.14 0.29 0.24 0.33 1.9 Heayberd 0.14 0.19 0.24 0.43 1.18 Horn 0.1 0.14 0.24 0.29 1.67 Hoyles 0.27 0.37 0.39 0.59 1.96 Jupp 0.1 0.29 0.33 0.38 2.1 Lee 0.1 0.1 0.1 0.7 2.43 Lukha 0.43 0.6 0.81 1 3 Mohamed 0.4 0.5 0.8 1.3 3.1 Nurse 0.17 0.17 0.66 0.52 2.42 Placek 0.29 0.33 0.38 0.38 1.57 Raja 0 0.1 0.2 0.2 2.1 Shah 0 0.095 0.19 0.19 2.2 Welch 0.048 0.29 0.14 0.24 2.43 Willard 0.16 0.38 0.42 0.68 2.11 Yazdani 0.14 0.33 0.24 0.67 2.3 CLASS AVERAGE= 0.18 0.3 0.37 0.56 2.21 Analysing Evidence From the results tables it can be seen that the rate of fermentation increases as the concentration also increases. My results are presented on graph 1. Also, another graph can be drawn to present the class results (graph 2). The...

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