Midterm 1 Review WS Law

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Apr 29, 2024

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General Chemistry Peer Tutoring Chem 1C University of California, Irvine Professor Law Kristine Acero ( acerok1@uci.edu ) https://sites.uci.edu/gcptutoring/ Ngoc-Han Nguyen ( ngochatn@uci.edu ) Midterm 1 Review Worksheet Topics Covered ● Kinetics ○ Supercooled Liquids ○ Chemical Reaction Rates and constant k ○ Rate Law ■ Intermediates ■ Molecularity of elementary steps ■ Fast vs Slow Step ○ Reaction Orders (zero, first, second order) ○ Reaction Half-life (t 1/2 ) for Order Reactions ○ Pseudo-Order Reaction Conditions ○ Effect of Temperature on Reaction Rate ○ Arrhenius Law ○ Collision Theory ■ Maxwell-Boltzmann speed distribution (mean relative speed) ○ Activation Energy and Transition States ○ Catalysis ○ Michaelis Menten Equation ● Equilibrium ○ Irreversible vs Reversible reaction ○ Dynamic Equilibrium and Constant K (with concentrations of molarity or with pressure) ■ ICE Table ■ Predicting the direction of the reaction ○ Reaction Quotient ○ Le Châtelier’s Principle ■ concentration of reactant(s) or product(s); adding inert gas ■ pressure or volume ■ temperature
General Chemistry Peer Tutoring Chem 1C University of California, Irvine Professor Law Kristine Acero ( acerok1@uci.edu ) https://sites.uci.edu/gcptutoring/ Ngoc-Han Nguyen ( ngochatn@uci.edu ) Rate Law and Reaction Orders 1. The tabulated data were collected for this reaction: CH 3 Cl(g) + 3 Cl 2 (g) → CCl 4 (g) + 3 HCl(g) Write an expression for the reaction rate law and calculate the value of the rate constant, k. What is the overall order of the reaction? Reaction Half-life (t 1/2 ) for Order Reactions 2. The decomposition of SO 2 Cl 2 is first order in SO 2 Cl 2 and has a rate constant of 1.42*10^- 4 s -1 at a certain temperature. (Tro 1st Ed., Ch. 15, #55) a. What is the half-life for this reaction? b. How long will it take for the concentration of SO 2 Cl 2 to decrease to 25% of its initial concentration? c. If the initial concentration of SO 2 Cl 2 is 1.00 M, how long will it take for the concentration to decrease to 0.78 M? **There’s no need to answer b through c. Integration of law orders are bonus class material and is not tested. Effect of Temperature on Reaction Rate
General Chemistry Peer Tutoring Chem 1C University of California, Irvine Professor Law Kristine Acero ( acerok1@uci.edu ) https://sites.uci.edu/gcptutoring/ Ngoc-Han Nguyen ( ngochatn@uci.edu ) 3. A reaction has a rate constant of 0.000122/s at 27 °C and 0.228/s at 77 °C. (Tro 1st Ed., Ch. 15, #70) a. Determine the activation barrier for the reaction. b. What is the value of the rate constant at 17 °C? Rate Law with Molecularity Steps 4. Consider this three-step mechanism for a reaction. (Tro 1st Ed., Ch. 15, #77) a. What is the overall reaction? b. Identify the intermediates in the mechanism. c. What is the predicted rate law? Catalysis
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