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Chemical Kinetics

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Collision theory and rates of reaction

Subtopic

Collision theory and rates of reaction under Chemical Kinetics for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    In a potential energy diagram, a catalyst provides a path with a ______.

    A.

    Higher transition state

    B.

    Lower activation energy

    C.

    More positive DeltaH\\Delta H

    D.

    More negative DeltaH\\Delta H

  2. 2.

    What happens to the rate of a reaction as the concentration of reactants decreases over time?

    A.

    It increases

    B.

    It decreases

    C.

    It stays constant

    D.

    It fluctuates randomly

  3. 3.

    An 'effective collision' is one that results in:

    A.

    A decrease in temperature

    B.

    The formation of products

    C.

    An increase in activation energy

    D.

    The destruction of the catalyst

Download the worksheet for Chemical Kinetics - Collision theory and rates of reaction to practice offline. It includes additional chapter-level practice questions.

Rate expression and reaction mechanism (HL only)

Subtopic

Rate expression and reaction mechanism (HL only) under Chemical Kinetics for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following is the correct expression for the rate of disappearance of reactant AA in the reaction ABA \rightarrow B?

    A.

    Rate=Δ[A]ΔtRate = \frac{\Delta[A]}{\Delta t}

    B.

    Rate=Δ[A]ΔtRate = -\frac{\Delta[A]}{\Delta t}

    C.

    Rate=Δ[B]ΔtRate = \frac{\Delta[B]}{\Delta t}

    D.

    Rate=k[B]Rate = k[B]

  2. 2.

    The units of a rate constant are dm6 mol2 s1dm^6\ mol^{-2}\ s^{-1}. What is the overall order?

    A.

    1

    B.

    2

    C.

    3

    D.

    0

  3. 3.

    Which of the following will NOT change the rate of a zero-order reaction?

    A.

    Changing the temperature

    B.

    Adding a catalyst

    C.

    Changing the concentration of the reactant

    D.

    Increasing the surface area of a solid reactant

Download the worksheet for Chemical Kinetics - Rate expression and reaction mechanism (HL only) to practice offline. It includes additional chapter-level practice questions.

Activation energy (HL only)

Subtopic

Activation energy (HL only) under Chemical Kinetics for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following describes an 'effective collision'?

    A.

    Any collision between two reactant molecules

    B.

    A collision that results in the formation of products

    C.

    A collision where molecules bounce off each other

    D.

    A collision that happens at high pressure

  2. 2.

    If a reaction's rate triples when the temperature is increased slightly, which factor is mostly responsible?

    A.

    An increase in collision frequency

    B.

    An increase in the fraction of molecules with EEaE \ge E_a

    C.

    A decrease in the activation energy

    D.

    An increase in the concentration of reactants

  3. 3.

    In the Arrhenius equation, if TT approaches infinity, what happens to the value of the rate constant kk?

    A.

    kk approaches 0

    B.

    kk approaches AA

    C.

    kk approaches EaE_a

    D.

    kk approaches infinity

Download the worksheet for Chemical Kinetics - Activation energy (HL only) to practice offline. It includes additional chapter-level practice questions.

Chemical Kinetics - IB Grade 12 Chemistry Notes & Revision | Krit.club