The questions that follow are based on the reaction and mechanism below. The oxi

Question

The questions that follow are based on the reaction and mechanism below. The oxidation of HBe to Brz by the reaction is thought to occur by the mechanism HOOBr+HBr-2HOBr 7) The experimental rate law for the reaction is rate-k(HB102]. What can be said about the relative rates of the steps in the mechanism? A) Step 2 must be faster than steps 1 and 3 Q Step 2 is slow relative to steps 1 and 3 B) Step 1 mast be faster than steps 2 and 3 D) Step 1 is slow relative to steps 2 and 3 8) How does an increase in the temperature increase the rate of a chemical reaction? A) There are more collisions that have enough energy for the molecules to react B) The activation energy needed to react is lowered at high temperatures O The molecules are pressed closer together, which causes the reaction to speed up. D) The number of collisions increases, but the energy of each collision doesnt change 9) Why don't all collisions with enough energy lead to reaction? A) Some collisions do not transfer the right amount of energy B) Some of the collisions lead to other reactions Some of the collisions have the wrong electron configuration D) The collisions must also have the correct orientation This equation may be used for the problems that follow (4 ) 10) The rate constant for a certain reaction triples between 25°C and 40 What is the activation energy 10) for this reaction? A) 56.8 kJ/mol B) 1.53 kJ/mol 833 k/mol D) 0.609 kJ/mol I1) The Arrhenius equation can be written What is the A term called? A) The frequency factor Q The mechanism factor B) The kinetic factor D) The activation energy

Explanation / Answer

7. Option D is the right answer.

as per rate equation, rate is proportional to concentration of HBr and O2, so, first step is the rate determinig step and rate determinig step is the slowest step.

11. option A is right answer. The frequency factor

10. A

K2 = 3K1 , R = 0.008314 kj; T1 = 298 K and T2 = 313 K, E = 56.8 kj/mol

8. A

kinetic energy is the function of temperature. with increase in temperature, kinetic energy increases and the number of collision also increase having enough energy to overcome the activation energy to reach the product state.

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