36 Questions
What is the rate of reaction proportional to?
The fraction of effective collisions
What is the term for the energy barrier that must be overcome before products are formed?
Activation energy
What is the relationship between Ea and Er for endothermic reactions?
Ea > Er
What is the term for the state in which the molecules must have energy at least equal to the threshold energy?
Activated complex
What is required for effective collisions to occur?
Sufficient energy and proper orientation
How is the rate of reaction related to the collision frequency (Z) and the fraction of effective collisions (f)?
Rate = Z × f
What is the branch of physical chemistry that deals with the rate of chemical reactions and the factors that influence them?
Chemical Kinetics
What type of reactions are usually molecular in nature and proceed with a measurable rate at normal temperature?
Moderate reactions
Which of the following reactions is an example of a very fast or instantaneous reaction?
AgNO3 + NaCl → AgCl + NaNO3
What is the main difference between very fast or instantaneous reactions and moderate reactions?
Reaction rates
What type of reaction is characterized by extremely slow rates and may take months to show any measurable change?
Very slow reaction
What is an example of a moderate reaction that is typically studied in chemical kinetics?
Decomposition of H2O2
What is the unit of rate constant in a chemical reaction?
litre·mol⁻¹·sec⁻¹
What is the relationship between the rate of a reaction and the concentration of reactants?
The rate of reaction is directly proportional to the concentration of reactants.
What is the molecularity of the reaction NH₄NO₂ → N₂ + 2H₂O?
Unimolecular
What is the significance of the slowest step in a reaction mechanism?
It is the rate-determining step.
What is the overall order of a reaction given by the rate law Rate = [A]x[B]y?
x + y
What is the significance of the rate constant (k) in a chemical reaction?
It is independent of the concentration of reactants.
What is the primary factor that determines the rate of a very fast or instantaneous reaction?
Ionic species involved in the reaction
Which type of reaction is typically associated with a high activation energy?
Very slow reaction
What is the significance of the rate constant in a chemical reaction?
It determines the rate of reaction at a given temperature
What is the primary difference between moderate and very slow reactions?
The rate of reaction
Which of the following is NOT a characteristic of very fast or instantaneous reactions?
They have a measurable rate
What is the significance of the decomposition of H2O2 in chemical kinetics?
It is an example of a moderate reaction
What is the relationship between the kinetic equation and the molar concentration of reactants, when all reactants are at the same concentration?
The kinetic equation is independent of the molar concentration of reactants.
What is the graphical representation of the reaction order, when a plot of Vs t is a straight line?
First order reaction
What is the overall order of the reaction Rate = k[A]2 [B] [C]0?
3
What is the relationship between the rate of reaction and the concentration of B, when keeping the concentrations of A and C constant?
The rate of reaction is doubled when the concentration of B is doubled.
What is the order of the reaction with respect to A, given the rate law expression Rate = k[A]2 [B] [C]0?
2
What is the relationship between the rate of reaction and the concentration of C, when keeping the concentrations of A and B constant?
The rate of reaction is unaffected when the concentration of C is doubled.
For a reaction to occur, what is the minimum energy requirement of the reactant molecules?
Threshold energy
What is the relationship between the rate constant (k) and the activation energy (Ea)?
k is exponentially related to Ea
What is the significance of the fraction of effective collisions (f) in the collision theory of reaction kinetics?
It represents the probability of a collision resulting in a reaction
What is the relationship between the activation energy (Ea) and the enthalpy of reaction (ΔH) for an endothermic reaction?
Ea < ΔH
What is the role of the activated complex in a reaction mechanism?
It is the transition state with energy equal to the threshold energy
What is the significance of the rate of reaction in chemical kinetics?
It is a measure of the speed at which the reactants are converted to products
Test your knowledge of chemical kinetics, including types of chemical reactions, factors affecting reaction rates, and more. Learn about the branch of physical chemistry that deals with reaction rates and mechanisms.
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