Exam 13: Chemical Kinetics

The following reaction is first order: C₂H₆ → 2 CH₃.If the rate constant is equal to 5.5 × 10^-4 s^-1 at 1000 K,how long will it take for 0.35 mol of C₂H₆ in a 1.00 L container to decrease to 0.10 mol in the same container?

When the concentration of A is doubled,the rate for the reaction: 2 A + B → 2 C quadruples. When the concentration of B is doubled the rate remains the same.Which mechanism below is consistent with the experimental observations?

The isomerization reaction,CH₃NC → CH₃CN,is first order and the rate constant is equal to 0.46 s^-1 at 600 K.What is the concentration of CH₃NC after 0.20 minutes if the initial concentration is 0.10 M?

Hydrogen iodide decomposes at 800 K via a second-order process to produce hydrogen and iodine according to the following chemical equation. 2 HI(g)→ H₂(g)+ I₂(g) At 800 K it takes 142 seconds for the initial concentration of HI to decrease from 6.75 × 10^-2 M to 3.50 × 10^-2 M.What is the rate constant for the reaction at this temperature?

What fraction of collisions will have sufficient energy to react for a gas whose activation energy is 68 kJ/mol at 25°C?

Which general rate law below corresponds to an elementary bimolecular reaction?

Nitrogen dioxide decomposes at 300°C via a second-order process to produce nitrogen monoxide and oxygen according to the following chemical equation. 2 NO₂(g)→ 2 NO(g)+ O₂(g). A sample of NO₂(g)is initially placed in a 2.50-L reaction vessel at 300°C.If the half-life and the rate constant at 300°C are 44 seconds and 0.54 M^-1 s^-1,respectively,how many moles of NO₂ were in the original sample?

A reaction has the rate law Rate = k[NO]²[H₂].If the concentration of NO is reduced by 1/3,the rate of reaction will be ________ (increased,decreased)by ________.

The fraction of collisions with sufficient energy to react is equal to

If the units for rate are M s^-1,what are the units for the rate constant,k,if the overall order of the reaction is five?

A catalyst increases the rate of a reaction by providing a different reaction pathway that

The first-order isomerization reaction: cyclopropane → propene,has a rate constant of 1.10 × 10^-4 s ^-1 at 470°C and an activation energy of 264 kJ/mol.What is the temperature of the reaction when the rate constant is equal to 4.36 × 10^-3 s^-1?

A reaction with an activation energy,E_a = 51.2 kJ/mol will proceed ________ times faster when the temperature is raised from 20 °C to 30 °C.

For the first-order reaction,2 N₂O(g)→ 2 N₂(g)+ O₂(g),what is the concentration of N₂O after 3 half-lives if 0.15 mol of N₂O is initially placed into in a 1.00-L reaction vessel?

A reaction has the rate law Rate = k[NO]²[H₂].If the concentration of NO is reduced by half and the concentration of H₂ is quadrupled,the rate of reaction will ________ (increase,decrease,not change).

The rate-determining step in a reaction is shown below.The molecularity of this reaction is ________. NO₂(g)+ NO₂(g)→ NO(g)+ NO₃(g)

The following reaction is first order in A and first order in B: A + B → Products Rate = k[A][B] What is the initial rate of this reaction in vessel (b)relative to the initial rate of this reaction in vessel (a)? Each vessel has the same volume.Shaded spheres represent A molecules,and unshaded spheres represent B molecules present at the beginning of the reaction.

A three-step mechanism has been suggested for the formation of carbonyl chloride: Step 1: Cl₂→ 2 Cl (fast,equilibrium) Step 2: Cl + CO → COCl (fast,equilibrium) Step 3: COCl + Cl₂ → COCl₂ + Cl (slow) What is the molecularity of the rate-determining step?

The data below were collected for the following reaction: 2 NO₂ (g)+ F₂ (g)2 NO₂F (g) What is the expression for the rate law of the reaction?

The aquation of tris(1,10-phenanthroline)iron(II)in acid solution takes place according to the equation: Fe(phen)₃²⁺ + 3 H₃O⁺ + 3 H₂O → Fe(H₂O)₆²⁺ + 3 phenH⁺ If the activation energy is 126 kJ/mol and frequency factor is 8.62 × 10¹⁷ s^-1,at what temperature is the rate constant equal to 3.63 × 10^-3 s^-1 for the first-order reaction?