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Jan 9, 2024

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CHEM 102 - Recitation Week 4 Using the "Key Concepts" and the "Key Equations and Relationships" in the Chapter Summary at the end of each chapter, identify and type in this Word document some concepts and/or equations needed to solve each item. Be prepared to share your ideas in class discussions. You are NOT required to solve the problems in detail. If you choose to do it to better participate in class discussion, keep in mind that full problem-solving is not graded for the pre- recitation assignment. To get full recitation credit, you must identify at least 1-2 correct and also different concepts for each question (see the Answer Key posted for week 1, which shows comprehensive examples of concept identification). Copying and pasting very general concepts (such as, “units of measure” or “dimensional analysis”, etc.) as the only identified concepts for multiple questions is not allowed. Ch. 21, 35 Write structural formulas for each of the nine structural isomers of heptane. Hydrocarbon equations Writing structural formulas Alkanes vs alkenes vs alkyne Structural isomers Ch. 21, 50 Write structural formulas for each of the possible isomers of n -pentyne that are formed by moving the position of the triple bond. Writing structural formulas Alkanes vs alkenes vs alkyne Hydrocarbon equations Ch. 21, 94 Determine whether each pair of structures are isomers or the same molecule drawn differently.
Functional groups Differentiating isomers Geometric isomerism Ch. 12, 69 Teflon is an addition polymer formed from the monomer shown here. Draw the structure of the polymer. Polymers Monomers Drawing structural formulas Ch. 14, 27. Consider the reaction indicated by the chemical equation below: 2 HBr (g) → H 2 (g) + Br 2 (g) a) Express the rate of the reaction in terms of the change in concentration of each of the reactions and products.
b) In the first 25.0 s of this reaction, the concentration of HBr drops from 0.600 M to 0.512 M. Calculate the average rate of the reaction during this time interval. c) If the volume of the reaction vessel in part b) is 1.50 L, what amount of Br 2 (in moles) forms during the first 15.0 s of the reaction? Reaction Rate laws and orders Rate of reaction Ch. 14, 32. Consider the reaction indicated by the chemical equation below and complete the table: 8 H 2 S (g) + 4 O 2 (g) → 8 H 2 O (g) + S 8 (g) [H 2 S]/ t [O 2 ]/ t [H 2 O]/ t [S 8 ]/ t Rate - 0.080 M/s Reaction rate laws and order Effect of temperature on reaction rate Ch. 14, 41. A reaction in which A , B , and C react to form products is first order in A , second order in B , and zero order in C . a) Write a rate law for the reaction. b) What is the overall order of the reaction? c) By what factor does the reaction rate change if [A] is doubled, while the rest of reactant concentrations are held constant? d) By what factor does the reaction rate change if [B] is doubled, while the rest of reactant concentrations are held constant? e) By what factor does the reaction rate change if [C] is doubled, while the rest of reactant concentrations are held constant?
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f) By what factor does the reaction rate change if the concentrations of all three reactants are doubled? Rate laws Reaction order Overall order Reactants vs products Ch. 14, 46. The tabulated data were collected for the reaction indicated by the chemical equation below : CH 3 Cl (g) + 3 Cl 2 (g) → CCl 4 (g) + 3 HCl (g) [CH 3 Cl] (M) [Cl 2 ] (M) Initial Rate (M/s) 0.050 0.050 0.014 0.100 0.050 0.029 0.100 0.100 0.041 0.200 0.200 0.115 Write the reaction rate law equation and calculate the value of the rate constant, k . What is the overall order of reaction? Overall order Rate laws Components of a chemical equation Ch. 14, 123. A student says, "The initial concentration of a reactant was doubled, and the rate doubled. Therefore, the reaction is second order in that reactant". Why might the student say that? What is wrong with the statement? What is the actual order with respect to the reactant? Explain your reasoning briefly and clearly. Rate constant Reaction order
Honors only Ch. 12, 72 Nomex, a condensation copolymer used by firefighters because of its flame-resistant properties, forms from isophthalic acid and m -aminoaniline. Draw the structure of the dimer and of the polymer. ( Hint : Water is eliminated when a carboxyl group from one monomer reacts with an amino group from the other monomer.) Isophthalic acid: m-Aminoaniline :