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LYMES am-style questions i) Explain the term enzyme. ii) State two ways in which an inorganic catalyst is different from an enzyme. Explain how the speed of an enzyme- controlled reaction is affected by changes in i) temperature ii) pH. [2] 2 Support your answers using sketch graphs. [6] The diagram shows an experiment to investigate me effect of temperature on removing fat stains sing an enzyme- containing washing powder. hree identical T shirts with identical fat stains were washed with the washing powder at three ifferent temperatures, 15°C, 35°C and 70°C. between a piece of vegetable and hydrogen peroxide. iil State two safety precautions you would take when carrying out this investigation. b Explain why digestion of starch in bread started in the mouth, stops when the br reaches the stomach. 4 The diagram shows an investigation into th permeability of Visking tubing and the act an enzyme on an unknown solution. Experiment 1 start after 15 minute before shing s after shing all shirts washed for 15 minutes iodine solution visking bag tied at both ends (brown) Experiment 2 start solution W (colourless) iodine perature colourless solution W solution (brown) °C °C wash plus enzyme at 35°C a Complete the diagram to state the temperature at which each shirt was washed. [1] b Explain the result for shirts A, B and C. c Suggest two changes to the method which could have resulted in the complete removal of the stain from shirt C. [1] [2] after 15 min di) State the name of the type of enzyme that was present in the washing powder. [1] ii) Another shirt had blood stains. Suggest an enzyme that would need to be present in the washing powder to remove these stains. a i) Describe how you would carry out an investigation to show the effect of changing temperature on the reaction a i) State what the results of experime indicate about the permeability of Visking bag to iodine. iil Suggest what nutrient was preser the solution. iii) Suggest why the iodine solution surrounding the bag stayed brow [1] b In experiment 2, il Suggest why the enzyme in the b kept at 35°C. ii) Explain why the solution in the was still brown after 15 minutes
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