Kinetics
For which compound would you expect dispersion forces to play the most significant role in determining its physical properties?
Carbon dioxide (CO₂)
Oxygen (O₂)
Hydrogen peroxide (H₂O₂)
Iodine (I₂)
How does increasing temperature generally affect the activation energy required for chemical reactions?
It decreases activation energy and increases kinetic energy.
It has no effect on either activation or kinetic energies but speeds up reactions by other means.
It does not change activation energy but increases kinetic energy allowing more particles to overcome it.
It increases both activation energy and kinetic energy.
How might an experiment be formulated to assess the influence of solvent viscosity on reaction mechanism and rate constant determination?
Investigating conductivity changes during electrolysis using different salt solutions as electrolytes.
Measuring and comparing rate constants for nucleophilic substitution reactions conducted in solvents with varying viscosities.
Recording pH shifts when diluting strong acids with solvents possessing different dielectric constants.
Analyzing enthalpy changes by conducting exothermic reactions within calorimeters containing various solvent densities.
Given the following reaction {NO2 + F2 → NO2F + F}, we know that rate = k[NO2][F2]2 . What is the order of the reaction relative to each reactants, and what is the overall reaction order?
NO2 = 0, F2 = 2, Overall = 2
NO2 = 1, F2 = 2, Overall = 2
NO2 = 0, F2 = 1, Overall = 1
NO2 = 1, F2 = 2, Overall = 3
Which molecular shape would a molecule with four atoms bonded to a central atom and no lone pairs on the central atom most likely have?
Bent
Linear
Trigonal planar
Tetrahedral
When a catalyst is added to a chemical reaction, what immediate effect does it have on one key component?
It lowers activation energy.
It decreases product concentrations.
It increases activation energy.
It raises enthalpy change (∆H) for reactions.
If the rate is R = k[A]^2[B] , what is the overall reaction order?
3
0
1
2

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Which change will NOT affect the rate of a chemical reaction governed by a first-order rate law?
Raising the temperature.
Increasing the concentration of reactants.
Reducing reactant particle size.
Adding a catalyst irrelevant to the reaction pathway.
Given a complex multistep mechanism, what method would conclusively identify if an early step is indeed slower than subsequent steps and thus acts as the rate-determining step?
Demonstrating all steps contribute equally to activation energy requirements reflected in Arrhenius plots
Measuring how changing each step's conditions selectively alters overall kinetics without significantly affecting other steps' speeds
Proving later steps must proceed faster due to their reliance on earlier steps' completion before initiation
Confirming each individual step proceeds at identical speeds under standard laboratory conditions
A reaction has a rate law of the following: R = k [A][B]. What is the overall order of reaction?
1st
4th
3rd
2nd