Passage 1
1. A
Pay attention to what is given. Since it states to look at Experiment 1 and the kinetics, observe the time in seconds at the different temperatures. As the temperature increases, the time decreases. This means at higher temperatures, it takes less time for the reaction to occur. Therefore, the kinetics of the forward and reverse reactions only increased as the temperatures increased.
2. B
For equilibrium reactions, it is important to know initial rates and equilibrium constants. By knowing these numbers at 0° C, it makes it easier to identify general trends, meaning the measurements at 0° C serve as the control to compare to the other temperatures.
3. D
This question asks about a comparison between the reverse and forward reactions in Experiment 1. Looking at the reaction given, it can be seen that “Reaction 2” is the reverse reaction of “Reaction 1” since the products and reactants are flipped. Since we are looking at the reverse reaction being faster than the forward reaction, and since faster reactions have a quicker completion rate, 32° C must be the answer since it’s the only option where Reaction #2 occurs quicker than Reaction #1.
4. A
Look at all the given information! This question is asking for the equilibrium constant of Reaction #2. In the given information, it says that the constant is the molarities of the products divided by the reactants. Furthermore, the starred info says that coefficients become POWERS in the equilibrium expression. Therefore, when writing the expression for Experiment #2, the [ICL] must be squared and so does the [HCL]. So, since the expression is products over reactants, “A” must be the answer.
5. B
Follow trends and the given information! Since the question asks to predict the expected equilibrium constant of the reverse reaction at about 60° C, Experiment 2 must be used since it mentions equilibrium constants. By looking at the other equilibrium constants, it can be seen that they are always being multiplied by 2. Being left with “B” and “C”, the difference between 45 and 60 is not that great; therefore, the smaller choice which happens to be “B”, is the answer.
6. C
In order to see if the hypotheses were correct, look at the different values in each table and the differences between Reactions #1 and #2. It is clear that there are no similarities between the parameters of Reaction #1 and #2. The hypotheses can be accepted, meaning we are left with “A” and “C”. To choose between these two, it must be noted that although the parameters were different, they weren’t completely unlike each other, meaning “C” offers the more accurate explanation.