Chapter 5: Rates, Collision Theory and Boltzmann Distributions

A-level ChemistryModule 3: Periodic Table & Energy8 topicsHigher

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Module 3: Periodic Table and Energy: Rates, Collision Theory and Boltzmann Distributions - Authored Long Answer Questions

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4 questions25 marks37.5 min

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6 marksdescribestandardOCR A

For Rates, Collision Theory and Boltzmann Distributions, describe how collision theory, activation energy and catalysts applies to calcium carbonate reacting with hydrochloric acid.

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6 markscalculatehardOCR A

Using calcium carbonate reacting with hydrochloric acid, calculate a relevant OCR A Rates, Collision Theory and Boltzmann Distributions quantity and explain the physical or chemical meaning of the answer. Show equation, substitution, answer and unit.

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Rates, Collision Theory and Boltzmann Distributions: Kinetic energy (kJ mol-1) vs Number of molecules (relative frequency)

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The Boltzmann distribution shows the spread of molecular kinetic energies. Only molecules with KE greater than or equal to Ea can react on collision; increasing temperature increases this fraction.

The graph for Rates, Collision Theory and Boltzmann Distributions shows data from calcium carbonate reacting with hydrochloric acid. Explain the pattern using the data and relevant chemistry principles.

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6 marksevaluatestandardOCR A

In calcium carbonate reacting with hydrochloric acid, evaluate the experimental method or model assumptions used when applying collision theory, activation energy and catalysts.

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4. Enthalpy, Calorimetry and Hess Cycles

6. Equilibrium, Le Chatelier and Kc

Key learning objectives

Understand the key principles behind Rates, Collision Theory and Boltzmann Distributions.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.