kinetics year 2 past paper question

Question 1

state the significance of this zero-order for the mechanism of the reaction

Answer 1

it does not appear in the slow step/ the rate-determining step

*allow it for B but it is better to refer back to the stem and say B

Question 2

explain qualitatively why doubling the temperature has a greater effect on the rate of the reaction than doubling the concentration of E

Answer 2

the reaction occurs when molecules have energy more or equal to the activation energy

Doubling T by 10C causes Many more molecules to have this activation energy
whereas doubling the concentration of E only doubles the number of particles with the activation energy

Question 3

suggest which one is the slow step
step 1: NO + NO - X
step 2: X +H2 - Y
step 3: Y + H2 - N2 + H2O

rate = k[NO]2[H2]

Answer 3

Step 2:

one H2 and two NO appears in step 2 and 1

Question 4

what is meant by the order of the reaction with respect to A

Answer 4

the power of concentration in the rate equation