Unit 5 is often a stand alone unit and offers a unique perspective on reactions. Episode 57 discusses the questions 2010B - Question 6 and 2019 - Question 6. These are released FRQs from previous exams and copyright of the College Board (0:44).

Question 6 of the 2010B exam focuses on the synthesis of hydrogen chloride from its elements (1:33). We are asked to determine the order of reaction for both reactants and justify the answer.

Question 6 of the 2019 exam looks at a decomposition reaction and the data collected is graphed in three graphs. We can use the graphs to identify the reaction as second order with respect to nitrogen dioxide and write the rate law. In part c we have two possible mechanisms, and have to determine if they are both consistent with the rate law. The first mechanism has a slow first step, the second mechanism has a slow second step and therefore requires substitution in the justification (7:43).

Question: What is the order of ALL half-life reactions on the AP Chemistry exam? A. zeroth order B. first order C. second order

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