Rates, Energetics and Electrolysis
Explain reaction rates and activation energy, calculate energy changes and predict electrolysis products and equations.
How to prepare for the current ESAT
Confirm your course combination, build no-calculator fluency from Mathematics 1 upward, and use official Pearson materials for authentic timing and interface rehearsal.
Core concepts
Concept 1
Use collision theory and graphs to explain concentration, pressure, surface area, temperature and catalyst effects.
Exam cue: Separate collision frequency from the fraction above activation energy.
Concept 2
Interpret energy profiles and calculate calorimetry or bond-energy changes with correct signs.
Exam cue: Define the system before assigning positive or negative energy change.
Concept 3
Track ions and electrons at cathodes and anodes in molten and aqueous electrolysis.
Exam cue: List all species available at each electrode before predicting a product.
Risk pitfalls and guardrails
Saying a catalyst changes equilibrium position.
Guardrail: Do not use calculator-dependent shortcuts, import a fact outside the annual specification or overlook a unit, sign, scale or course-module boundary.
Reversing bond breaking and bond formation energy signs.
Guardrail: Do not use calculator-dependent shortcuts, import a fact outside the annual specification or overlook a unit, sign, scale or course-module boundary.
Calling the anode negative in electrolysis.
Guardrail: Do not use calculator-dependent shortcuts, import a fact outside the annual specification or overlook a unit, sign, scale or course-module boundary.
Memory anchors
Rate evidence
Measure reactant loss, product gain or a changing property over time.
Catalyst
Provides a lower-activation-energy route and is regenerated.
Exothermic
Energy released; ΔH is negative.
Bond energies
Energy in equals bonds broken; energy out equals bonds formed.
Cathode
Reduction by gaining electrons.
Anode
Oxidation by losing electrons.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Increasing temperature speeds reaction mainly because?
A catalyst works by?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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