The following two different two-step mechanisms were proposed for the reaction ####…

CHEMISTRY · Multi-part · A Level · Chemistry · Rate equations · Rate equations

Problem

The following two different two-step mechanisms were proposed for the reaction A+2B→CA + 2B \rightarrow C #### Mechanism 1 step 1: 2B→D2B \rightarrow D (slower step) step 2: D+A→CD + A \rightarrow C #### Mechanism 2 step 1: A+B→DA + B \rightarrow D (slower step) step 2: D+B→CD + B \rightarrow C The rate equation for the reaction was found to be the following: rate=k[B]2\text{rate} = k[B]^2 (1) - a Which mechanism agrees with this rate equation? (2) - b What name is given to a substance that is produced in one step and then used up in a subsequent step?

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