18 Students were provided with cubes of slightly alkaline gelatine of different dimensions, containing an acid-alkali indicator that is red in alkali but yellow in acid. The cubes were placed in dilute acid solution, and the time taken for the colour in the gelatine to change from red to yellow was measured. Dimensions/mm Surface area/mm² Volume/mm³ Time/minutes 10 x 10 x 10 600.0 1000.0 12.0 5x 5 x5 150.0 125.0 4.5 4x 4 x4 96.0 64.0 4.2 2.5 x 2.5 x 2.5 a For each block, calculate the ratio of surface area to volume (SA:V). b Plot a graph of the time taken for the colour change (vertical or y axis) against the SA:V ratio (horizontal or x axis). c Explain why the colour changes more quickly in some blocks than others. 37.5 15.6 4.0
18 Students were provided with cubes of slightly alkaline gelatine of different dimensions, containing an acid-alkali indicator that is red in alkali but yellow in acid. The cubes were placed in dilute acid solution, and the time taken for the colour in the gelatine to change from red to yellow was measured. Dimensions/mm Surface area/mm² Volume/mm³ Time/minutes 10 x 10 x 10 600.0 1000.0 12.0 5x 5 x5 150.0 125.0 4.5 4x 4 x4 96.0 64.0 4.2 2.5 x 2.5 x 2.5 a For each block, calculate the ratio of surface area to volume (SA:V). b Plot a graph of the time taken for the colour change (vertical or y axis) against the SA:V ratio (horizontal or x axis). c Explain why the colour changes more quickly in some blocks than others. 37.5 15.6 4.0
Chapter8: Forms Of Drugs And How They Act
Section: Chapter Questions
Problem 30RQ
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