# Given the following rate law how does the rate of

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5. Given the following rate law, how does the rate of reaction change if the concentration of Y is doubled? Rate = k[X]2[Y]3 A. The rate of reaction will increase by a factor of 9. B. The rate of reaction will increase by a factor of 2. C. The rate of reaction will increase by a factor of 8. D. The rate of reaction will increase by a factor of 4. 6. For the reaction 3A( g ) + 2B( g ) 2C( g ) + 2D( g ) the following data was collected at constant temperature. Determine the correct rate law for this reaction. Trial Initial [A] Initial [B] Initial Rate (mol/L) (mol/L) (mol/(L · min)) 1 0.200 0.100 6.00 × 10 –2 2 0.100 0.100 1.50 × 10 –2 3 0.200 0.200 1.20 × 10 –1 4 0.300 0.200 2.70 × 10 –1 B. Rate = k [A][B] 2 C. Rate = k [A] 3 [B] 2 D. Rate = k [A] 1.5 [B] E. Rate = k [A] 2 [B] 7. For the reaction A( g ) + 2B( g ) 2C( g ) + 2D( g ) the following data was collected at constant temperature. Determine the correct rate law for this reaction. Trial Initial [A] Initial [B] Initial Rate (mol/L) (mol/L) (mol/(L · min)) 1 0.125 0.200 7.25 2 0.375 0.200 21.75 3 0.250 0.400 14.50 4 0.375 0.400 21.75 B. Rate = k [A] 2 [B] C. Rate = k [A] [B] 2 D. Rate = k [A] E. Rate = k [A] 3 8. Which of the following sets of units could be appropriate for a zero–order rate constant?
Chem108–W20–Final Exam Prep Stuff page 7 9. Which one of the following sets of units is appropriate for a second–order rate constant? A. s–1B. mol L–1s–1C. L mol–1s–1D. mol2L–2s–1E. L2mol–2s–1 10. A study of the decomposition reaction 3RS23R + 6S yields the following initial rate data: [RS2](mol L–1) Rate (mol/(L·s)) 0.150 0.0394 0.250 0.109 0.350 0.214 0.500 0.438 What is the rate constant for the reaction? 11. Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water. From 164.5°C to 179.0°C, the rate constant increases by a factor of 4.27. What is the activation energy of this oxidation reaction? 12. A reaction has an activation energy of 195.0 kJ/mol. When the temperature is increased from 200.°C to 220.°C, the rate constant will increase by a factor of 13. How does increasing the temperature of a reaction affect the reaction rate? A. It slows the rate down by changing the heat of reaction. B. It speeds the rate up by raising the activation energy. C. It slows the rate down by increasing the activation energy. D. It speeds the rate up by increasing the kinetic energy of the molecules. E. It slows the rate down by increasing the kinetic energy of the molecules. Some more exam 3 (acid/base and buffer) practice problems:
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