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Investigate effectiveness of a biological washing powder Plan: We will try and investigate how long it takes for the food stain to dissolve depending on the temperature, since the rate of reaction changes as the temperature changes. We will do this by using water with different temperatures. Hypothesis: We believe that the food stain will dissolve faster as the temperature increases. But it will stop increasing once it reaches its optimum temperature which is 40C, because once it goes over 40C the enzymes will start to denature and thus the reaction will start to slow down again. Materials: Washing powder 5C water 40C water 100C water Beaker Tripods Bunsen burner Cloth Stop watch Stirring rods Ketchup Independent and controlled variables: The time will be kept as an independent variable and we will make sure that the controlled variables are the amount of water, amount of washing powder, amount of stain stuff and the size of the material used. We will do this because in order...

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