Interpreting Rate, Yield and Condition Data Quiz

In an industrial chemical process, what does the rate of reaction describe?

A company measures how long it takes to produce 100 kg of product at different temperatures: at 200°C it takes 10 hours, at 250°C it takes 6 hours, and at 300°C it takes 3 hours. At which temperature is the reaction rate highest?

A reaction has a yield of 75%. What does this mean?

For a reversible reaction, a company collects data: at 350°C the rate is described as slow and the yield is 80%; at 450°C the rate is medium and the yield is 60%; at 550°C the rate is fast and the yield is 40%. Why might they choose to run the reaction at 450°C instead of 350°C?

A reaction is carried out at 400°C and 200 atm with and without a catalyst. Without a catalyst it makes 500 kg of product in 4 hours; with a catalyst it makes 500 kg in 1 hour, and the final yield is 60% in both cases. What does this data show about the effect of the catalyst?

For a certain industrial reaction, the percentage yield at different temperatures is: 300°C gives 85%, 400°C gives 70%, 500°C gives 50%. A student says ‘Increasing the temperature always increases the yield of a reaction.’ What does this data suggest?

A company can choose between two sets of conditions for the same reaction. Option A: low pressure, cheaper equipment, rate is medium, yield is 65%. Option B: very high pressure, expensive equipment, rate is fast, yield is 70%. Which is the best reason why the company might still choose Option A?