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CAIE IGCSE Chemistry Interpreting Reaction Pathway Diagrams

Practise reading reactant and product energy levels, determining the sign and size of the energy change and classifying pathway diagrams.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • classify a pathway as exothermic when products are lower or endothermic when they are higher
  • read the overall energy change from the vertical gap between reactant and product levels
  • select a diagram that matches the reaction and compare which pathway releases more energy

5.1.3—Interpret reaction pathway diagrams question 1

[Maximum number: 1]

The energy level diagram shows the energy profile for the reaction between zinc and dilute sulfuric acid.

Figure for Question 5.1.3—Interpret reaction pathway diagrams question 1 — CAIE IGCSE Chemistry

Is the reaction endothermic or exothermic? Explain your answer.

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