🧪 Chemistry Quiz 16: Reaction Rates, Activation Energy, and Catalysis

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🧪 Chemistry · Quiz 016

Establish the kinetic description of chemical change before equilibrium, including rate, collision requirements, rate laws, activation barriers, and catalysts.

Learning goalExplain and quantify basic reaction-rate behavior and distinguish kinetic effects from thermodynamic or equilibrium effects.

  • 5 questions
  • Applied understanding
  • Explanations after finishing
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FoundationWhat does a chemical reaction rate measure?
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A rate describes how a measurable quantity changes with time.

UnderstandingWhy does increasing temperature usually increase the rate constant for a reaction with a positive activation energy?
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Think about the molecular energy distribution relative to the activation-energy threshold.

ApplicationEqual masses of calcium carbonate react separately with the same excess concentration of hydrochloric acid. Why will finely powdered CaCO₃ usually react faster than one large CaCO₃ chip?
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For a reaction involving a solid and a solution, consider how much solid is accessible at the interface.

InterpretationFor a reaction studied by initial rates, doubling [A] while holding all other reactant concentrations and temperature constant causes the initial rate to increase by a factor of four. What is the reaction order with respect to A?
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Model the dependence as rate ∝ [A]^m and compare 2^m with the observed rate factor.

ConnectionA catalyst is added to a reversible reaction at fixed temperature. Which statement correctly describes its effect?
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Separate what a catalyst changes about the pathway from what it does not change about reactant-product thermodynamics.

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