Question

1. A reaction of great social significance is the fermentation of sugar with yeast. This is

Zero order (in sugar) reaction, where the yeast is a catalyst (it does not enter the reaction

itself). If a 0.5 liter bottle contains 4 grams of sugar, and it takes 30 minutes to convert

50% of the sugar, what is the kinetic rate constant?

2. An oil storage area was abandoned 19 years ago. Oil spilled on the ground had saturated the soil at a concentration of 400 mg/kg of soil. A

Fast food chain now wants to build on the site. Soil samples show that there are oil residues of 20 mg/kg of soil

The local engineer concludes that since the oil must have been destroyed by the soil microorganisms (biodegradation) at a rate of 20 mg/kg each year, and that in one more year the site will be free from all contamination.

Is this a good assumption? Why or why not?

Analyze the data for zero, first and second order reaction rates                                                

Determine the values of the kinetic constants for each rate type

Predict the amount of oil remaining after 1 more year for each rate type

How long would you figure it would take for the soil to be below the acceptable contamination level of 1 mg/kg of soil?

·Use all 3 rate models to make the prediction

·Which of the 3 models would you suggest using to make decisions? Why?

Answer 1

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